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leiy
April 17th, 2015, 01:00 AM
Altair 8800 SN221148A received, factory assemble status confirmed, beside A suffix on serial, the CPU board mark is also an "A".

The rev 0 motherboard use red wire to connect, very interesting.

I suppose this computer was initially used for exhibition , no case, no front panel, but later owned by a buyer for regular daily use, the buyer later add a North star controller and a Processor Tech 3PIO board instead of 88-SIO/88-4PIO board.

I will upload detailed photos later.


I have tested the machine, it works well, the MITS DRAM board works reliable just like MITS static ram board that surprised me, unbelievable!


Both CPU board and Serial number sticker confirms this Altair 8800 is a factory assembled.

CPU with "1001017A" mark on pcb. a lot of chip coded 7507, makes me even believe this computer is an early 1975 product. The C8080A date code should be early 1975 one, I suppose.
http://www.vintage-computer.net.img.800cdn.com/bbsupload/sn221148a/002.jpg

Back serial number with "SN221148A"
http://www.vintage-computer.net.img.800cdn.com/bbsupload/sn221148a/001.jpg

The date code of Altair Bus edge connector: 7504
http://www.vintage-computer.net.img.800cdn.com/bbsupload/sn221148a/006.jpg

This photo shoot angle clearly indicate "Factory Assembled style"
http://www.vintage-computer.net.img.800cdn.com/bbsupload/sn221148a/007.jpg

Nice factory assembled style
http://www.vintage-computer.net.img.800cdn.com/bbsupload/sn221148a/008.jpg

The chip left from CPU even date coded "7301"
http://www.vintage-computer.net.img.800cdn.com/bbsupload/sn221148a/004.jpg

a lot of chip coded 7507
http://www.vintage-computer.net.img.800cdn.com/bbsupload/sn221148a/003.jpg

Memory metal chip date coded 7528 very early indeed.
http://www.vintage-computer.net.img.800cdn.com/bbsupload/sn221148a/005.jpg


================================================== =

Here's more photos:

http://www.vintage-computer.net.img.800cdn.com/bbsupload/sn221148a/009.jpg

http://www.vintage-computer.net.img.800cdn.com/bbsupload/sn221148a/010.jpg

http://www.vintage-computer.net.img.800cdn.com/bbsupload/sn221148a/011.jpg

http://www.vintage-computer.net.img.800cdn.com/bbsupload/sn221148a/013.jpg

http://www.vintage-computer.net.img.800cdn.com/bbsupload/sn221148a/014.jpg

http://www.vintage-computer.net.img.800cdn.com/bbsupload/sn221148a/017.jpg

http://www.vintage-computer.net.img.800cdn.com/bbsupload/sn221148a/015.jpg

http://www.vintage-computer.net.img.800cdn.com/bbsupload/sn221148a/016.jpg

Corey986
April 17th, 2015, 03:14 AM
I have noticed the factory boards used the red wire. The white wire was prone to break. I have a NOS roll of it I paid an arm and a leg for to rewire my Altair with. The key is to wire lace the wires so they support each other, some machines won't need rewiring if they weren't disturbed much before lacing. Mine was, the wires had been moved so much they were breaking off at the ends where they were soldered, so I gave up and tracked down the correct wire and redid everything. A many month but very satisfying project. I even used NOS solder from the 70's, don't tell the EPA. LOL I also think it makes my Rev-0 the most reliable one out there with multiple Altair 4 slot motherboards. Now I think of it in the spirit of vintage cars. I did an engine rebuild and used NOS spark plug wires and gaskets where the old parts were worn, but kept all the original "components".

Cheers,
Corey

leiy
April 17th, 2015, 04:49 AM
I have noticed the factory boards used the red wire. The white wire was prone to break. I have a NOS roll of it I paid an arm and a leg for to rewire my Altair with. The key is to wire lace the wires so they support each other, some machines won't need rewiring if they weren't disturbed much before lacing. Mine was, the wires had been moved so much they were breaking off at the ends where they were soldered, so I gave up and tracked down the correct wire and redid everything. A many month but very satisfying project. I even used NOS solder from the 70's, don't tell the EPA. LOL I also think it makes my Rev-0 the most reliable one out there with multiple Altair 4 slot motherboards. Now I think of it in the spirit of vintage cars. I did an engine rebuild and used NOS spark plug wires and gaskets where the old parts were worn, but kept all the original "components".

Cheers,
Corey

That is enjoyable moment, and thanks for share very valuable particulars detail.

Marty
April 17th, 2015, 05:39 AM
Hi All;
Leiy, Congratulations !!
The chip in the picture with a stamped 7406 is the chip number the date code is the other number 7301A..
The Signetics date code is correct..
By the way what part of the world are You in ?? Just wondering, since You seem to find so many machines..
THANK YOU Marty

leiy
April 17th, 2015, 05:53 AM
Hi All;
Leiy, the chip in the picture with a stamped 7406 is the chip number the date code is the other number 7301A..
The Signetics date code is correct..
THANK YOU Marty

Hi Marty;
Thanks for figure out the mistakes, I have made correction.

7310A.. this is a really old chip.

Marty
April 17th, 2015, 06:03 AM
Hi All;
Leiy, I think the Date code for the CPU is 84th week of 1972, which would fit my understanding of Intel selling Mits factory defective CPU Ic's at a lower price than the regular buyer could get.. So they may have stored alot of their defects for a long time, hoping for a way to recoup some of their chip investments and selling them as a 'Second'..
THANK YOU Marty

leiy
April 17th, 2015, 06:12 AM
Hi All;
Leiy, I think the Date code for the CPU is 84th week of 1972, which would fit my understanding of Intel selling Mits factory defective CPU Ic's at a lower price than the regular buyer could get.. So they may have stored alot of their defects for a long time, hoping for a way to recoup some of their chip investments and selling them as a 'Second'..
THANK YOU Marty

Hi, Marty;

The N7284 mark on gold cap is not correspond to data code, the date code of 8080 usually on CPU backside.

Accroding to this time line table(http://www.cpu-world.com/forum/viewtopic.php?t=19272&highlight=8080), this C8080A cpu shoud produced around 18th week of 1975, short after debut of 8080-8.

As far as I know, as rumor spread to market, Intel & MITS have made a joint statement, declare that 8080 cpu used in Altair 8800 have no defects.

KC9UDX
April 17th, 2015, 06:25 AM
I think he meant the 136th week of 1971.

Corey986
April 18th, 2015, 02:32 AM
the machine looks great!!! Very clean.

And yes if I remember there is a date code on the bottom of the chip and county of origin.

DDS
April 18th, 2015, 04:52 AM
I think he meant the 136th week of 1971.

It's hard to read the last part but it might be Septober 83rd. ;-)

leiy
April 19th, 2015, 12:47 AM
Thanks Marty, I'm from other side of world about 10000+ kilometer away from United States.

leiy
April 19th, 2015, 12:51 AM
the machine looks great!!! Very clean.

And yes if I remember there is a date code on the bottom of the chip and county of origin.

I run "Kill the bits" game and let it loop for around 24 hours. There's no crash, no freeze and no mal-pattern of LED light to happen. Very stable.

leiy
April 25th, 2015, 09:33 PM
Here's my restoration in process:

Just lack original REV 0 front panel now.

When restoration complete, I will connect the 1148th 8800 to teletype 33 ASR, and load program with paper tape.

http://www.vintage-computer.net.img.800cdn.com/bbsupload/sn221148a/1.jpg

http://www.vintage-computer.net.img.800cdn.com/bbsupload/sn221148a/2a.jpg

http://www.vintage-computer.net.img.800cdn.com/bbsupload/sn221148a/3.jpg

leiy
May 20th, 2015, 01:55 AM
Here it comes.

The original REV.0 Altair 8800 silk screened front panel finally here.

http://www.vintage-computer.net.img.800cdn.com/bbsupload/sn221148a/restore/4.jpg

leiy
May 20th, 2015, 01:58 AM
back side of rev.0 silk screened front panel.

http://www.vintage-computer.net.img.800cdn.com/bbsupload/sn221148a/restore/5.jpg

leiy
May 20th, 2015, 01:59 AM
Mounting front panel to Altair 8800 SN221148A

http://www.vintage-computer.net.img.800cdn.com/bbsupload/sn221148a/restore/1.jpg

leiy
May 20th, 2015, 02:01 AM
Mounted, perfect matching!

http://www.vintage-computer.net.img.800cdn.com/bbsupload/sn221148a/restore/2.jpg

leiy
May 20th, 2015, 02:02 AM
And test good.

When the computer running, the natural rosin fragrance fill in air, and smell very nice!

http://www.vintage-computer.net.img.800cdn.com/bbsupload/sn221148a/restore/3.jpg

http://www.vintage-computer.net.img.800cdn.com/bbsupload/sn221148a/restore/13.jpg

leiy
May 20th, 2015, 02:06 AM
I will install Altair Disk dual board controller with pin insulated, for collection & demonstration purpose only.

I will install FDC+ for rest 48K RAM, and run Altair Disk with FDC+. And I'm waiting FDC+ to arrive.

leiy
May 24th, 2015, 03:39 AM
update

This will almost be the final look of inside of the Altair 8800 SN221148A, I will insert FDC+ between 88-2 SIO and 88-S4K DRAM board and insulate the pin of Altair disk controller.

From CPU board, 88-S4K DRAM, 88-S4K DRAM, 88-S4K DRAM, 88-S4K DRAM, 88-2 SIO board, 88-4-PIO board, Altair disk controller board #1, Altair disk controller board #2

http://www.vintage-computer.net/bbsupload/sn221148a/final/01.jpg

Marty
May 25th, 2015, 04:22 AM
Hi All;

Leiy, can You do me a favor, this is for K1atn..
Can You post the following, voltages from the three Transformers ?? and Voltages from the Buss both without Boards and with Your Boards in it ??

THANK YOU Marty

leiy
May 25th, 2015, 05:28 AM
Hi All;

Leiy, can You do me a favor, this is for K1atn..
Can You post the following, voltages from the three Transformers ?? and Voltages from the Buss both without Boards and with Your Boards in it ??

THANK YOU Marty

You are welcome.

Since I'm not so professional. Please indicate which point I should measure, please mark red rings on the photo so I can measure the proper voltage for you.

http://www.vintage-computer.net/bbsupload/sn221148a/psu.jpg

http://www.vintage-computer.net/bbsupload/sn221148a/psu1.jpg

http://www.vintage-computer.net/bbsupload/sn221148a/psu2.jpg

http://www.vintage-computer.net/bbsupload/sn221148a/psu3.jpg

Marty
May 25th, 2015, 06:04 AM
Hi All;
Leiy, Thank You for your response..
I do NOT know how to do the Red Ring thing..
But, on page 62 of the Altair Assembly Manual, it shows all of the connections..
Anyway on the Black connector Block, that You show in Your picture.. Set Your Voltmeter to DC to somewhere above the 50 volt range and put one probe on the Bottom screw which is Ground.. And put the other probe on each of the four screws above that last one.. One at a time and record those voltages, with All Boards in and with NO Boards in..
Next, switch Your Meter to AC and Measure the between the two "Y" connections, and record that voltage for T3, Measure between the two "G" connections, and record that voltage for T1 and Measure the voltage between one of the "W" and one of the "R" connections and record that voltage for T2.. These are on the right side of the Power Supply Board, looking from the front of the computer.. The Power Supply Board just sits below the Black Block You Measured DC from..
I hope this makes sense..
If You cannot Measure the input voltages from the Transformers, then don't worry about it and I hope that Kt1an understands and If He need those reading can ask for them..

THANK YOU Marty

leiy
May 25th, 2015, 06:36 AM
Hi All;
Leiy, Thank You for your response..
I do NOT know how to do the Red Ring thing..
But, on page 62 of the Altair Assembly Manual, it shows all of the connections..
Anyway on the Black connector Block, that You show in Your picture.. Set Your Voltmeter to DC to somewhere above the 50 volt range and put one probe on the Bottom screw which is Ground.. And put the other probe on each of the four screws above that last one.. One at a time and record those voltages, with All Boards in and with NO Boards in..
Next, switch Your Meter to AC and Measure the between the two "Y" connections, and record that voltage for T3, Measure between the two "G" connections, and record that voltage for T1 and Measure the voltage between one of the "W" and one of the "R" connections and record that voltage for T2.. These are on the right side of the Power Supply Board, looking from the front of the computer.. The Power Supply Board just sits below the Black Block You Measured DC from..
I hope this makes sense..
If You cannot Measure the input voltages from the Transformers, then don't worry about it and I hope that Kt1an understands and If He need those reading can ask for them..

THANK YOU Marty

Hi, Marty

I mean "red ring" is small indicator you can mark on photo so I can measure the voltage.

I've read your instruction. I can measure the voltage in my 221876K Altair 8800, the S-100 boards in 221876K are relatively easy to detach (boards in 221148A are so tight in slot, that are very hard to plugin and pullout, and that is too risky to broke the board pillars). I will have multi-meter tomorrow and measure it in working 221876K

Cheers, Leiy.

Marty
May 25th, 2015, 09:09 AM
Hi All;
Leiy, Thank You for Your response..

"" I mean "red ring" is small indicator you can mark on photo so I can measure the voltage. ""
I knew what You meant, I just don't know how to do that.. I have never done anything with photo's except copy them..

"" I've read your instruction. I will have multi-meter tomorrow and measure it in working 221876K ""
That's fine..

THANK YOU Marty

leiy
May 25th, 2015, 09:53 PM
Hi All;
Leiy, Thank You for Your response..

"" I mean "red ring" is small indicator you can mark on photo so I can measure the voltage. ""
I knew what You meant, I just don't know how to do that.. I have never done anything with photo's except copy them..

"" I've read your instruction. I will have multi-meter tomorrow and measure it in working 221876K ""
That's fine..

THANK YOU Marty

Hi, Marty

Here's the result from 221876K

=================

with six boards attached and ROM monitor running (CPU board, four 16K SRAM boards and one Turnkey board.)

10.8V
17.1-17.2V
7.5-7.6V
10.5V
<Ground SCREW>


without board attached:

17.6-17.7V
20.7V
10.6V
10.6V
<Ground SCREW>



=================


The AC power lines are too underneath, I can't measure the AC line without tear-down power supply board and some transformer. It is too risky as I'm not a professional for this, Sorry.

=================

http://www.vintage-computer.net/bbsupload/sn221148a/voltage.jpg

Marty
May 26th, 2015, 04:49 AM
Hi All;
Leiy, Thank You for doing this..
I am sure that there are others that need this information and the pictures.. So, Thanks again !!

THANK YOU Marty

Corey986
May 26th, 2015, 04:56 AM
Ok I'm really confused by your last picture. Maybe I missed a pic. But how are you removing the other motherboards from the chassis? Are they not jumper wired in to the first motherboard? Also could be a trick of the light, but the attached motherboard looks like a rev-1. It looks thick and dark green. I have only seen rev-1 boards like this. Actually I have seen rev-1 boards in natural and dark green. When you take the chassis off and look underneath. What does the motherboard that's attached say?

Thanks,
Corey

Marty
May 26th, 2015, 02:39 PM
Hi All;

"" What does the motherboard that's attached say? ""

Ouch, Beg your Pardon, I was comfortable there..

THANK YOU Marty

leiy
May 26th, 2015, 05:01 PM
Ok I'm really confused by your last picture. Maybe I missed a pic. But how are you removing the other motherboards from the chassis? Are they not jumper wired in to the first motherboard? Also could be a trick of the light, but the attached motherboard looks like a rev-1. It looks thick and dark green. I have only seen rev-1 boards like this. Actually I have seen rev-1 boards in natural and dark green. When you take the chassis off and look underneath. What does the motherboard that's attached say?

Thanks,
Corey



The 221187K rev 0 only has stock configuration, the additional s100 plate is from California computer system, I use a self made connector to connect each other.

Principally, I can also connect the 12 slots California computer plate to 23th Altair, without any damage to the original stock (But I decide never do this. I permanently place the 23th to dry glass box with humidity level <25RH)

http://i4004.info/data/attachment/forum/201501/31/140846mmuuakao99yzulfl.jpg

Below is my 221876K with alot of boards populated in 12 slots plate.
http://i4004.info/data/attachment/forum/201501/31/172925gjpjv5dq0yj8atvy.jpg

leiy
May 26th, 2015, 05:17 PM
Hi All;
Leiy, Thank You for doing this..
I am sure that there are others that need this information and the pictures.. So, Thanks again !!

THANK YOU Marty


You are welcome.

Corey986
May 27th, 2015, 03:14 AM
Very cool idea on how to add boards without making modifications.

Just be careful how many boards you put on that stock power supply. They are undersized.

Marty
May 27th, 2015, 04:49 AM
Hi All;

"" Just be careful how many boards you put on that stock power supply. They are undersized. ""
That is why I went to switchers, and that the Ripple is less.. I used the same ones that Grant used in His Replica's..

THANK YOU Marty

leiy
May 31st, 2015, 12:14 AM
Very cool idea on how to add boards without making modifications.

Just be careful how many boards you put on that stock power supply. They are undersized.

Thanks for advice, I will insulate Altair Disk controller pins when I received FDC+

leiy
May 31st, 2015, 12:23 AM
Finally, it fun 4K Basic happy, the computer is fully working!


Bootstrap loader before send basic to RAM.

000: 076 003 323 020 076 025 323 020
010: 041 256 017 061 032 000 333 020
020: 017 320 333 021 275 310 055 167
030: 300 351 013 000



http://www.vintage-computer.net/bbsupload/sn221148a/basic/SCREEN_BASIC_OK.png

http://www.vintage-computer.net/bbsupload/sn221148a/basic/SCREEN_BASIC_OK1.png

http://www.vintage-computer.net/bbsupload/sn221148a/basic/SCREEN_BASIC_OK2.png

Front penal light status when running loops.

http://www.vintage-computer.net/bbsupload/sn221148a/basic/DSC04805.jpg

I will test the Altair Disk, when I get hard sectored 8 inch floppy disk.

leiy
June 5th, 2015, 08:59 PM
I designed a simple acrylic adapter to mount DB37 cable on backpanel DB25 holes.

The DB37 Altair Disk cable can safely connect to drive.

http://www.vintage-computer.net/bbsupload/sn221148a/db37.jpg

tkc8800
June 6th, 2015, 12:25 AM
Nice work on the adapter and getting 4k Basic loaded!

leiy
June 19th, 2015, 11:37 PM
Nice work on the adapter and getting 4k Basic loaded!

Thank you.

Today, I tested My Altair Disk and Altair Disk controller, run test code to enable disk successfully, it seems in working condition. I desperately need some hard sectored 8" floppy disk to do a full test.

The electric motor in Pertec drive running happily, the running sound is good!


http://www.vintage-computer.net/bbsupload/sn221148a/altair_disk/1.jpg

The test code I'm used from Altair Disk manual:
http://www.vintage-computer.net/bbsupload/sn221148a/altair_disk/4.jpg

http://www.vintage-computer.net/bbsupload/sn221148a/altair_disk/3.jpg

http://www.vintage-computer.net/bbsupload/sn221148a/altair_disk/2.jpg

After some single step, The HEAD LOAD light turns on:
http://www.vintage-computer.net/bbsupload/sn221148a/altair_disk/5.jpg

http://www.vintage-computer.net/bbsupload/sn221148a/altair_disk/6.jpg

The disk drive should work properly, I need some hard sectored diskette to do a final test.

Marty
June 20th, 2015, 04:33 AM
Hi All;

Leiy, where are You Located, I think I asked before, I just forgot ??
I have some 8" Diskettes.. I will need to find them..
My Altair Drive Boards Quit some Years ago..

THANK YOU Marty

deramp5113
June 20th, 2015, 06:13 AM
Leiy,

While you wait on hard sector floppies, your FDC+ will work with soft sector floppies and make them look like hard sector floppies. It does this by syncing to the rotational rate of the drive and generating sector pulses on the fly. You'll even see the pulses on the front panel lights as described in Note 3 in the test you just ran.

Mike

Marty
June 20th, 2015, 10:46 AM
Hi All;

I just got my Altair out, and Re-configured it, for Altair use, instead of Z-80 and FDC..

Here is a Picture of it, with one Drive, the Second Drive is still put away..

24873

Leiy, I will try to get it up to speed like what You are doing..

24876

My copy of Burcon CPM 2.2 does not work, it just keeps on scrolling the Sign-on message,
But, my MITS DOS ver. 1.0 does work, I only need to find the Manual for it, to find out what commands it accepts..

24883 24884

THANK YOU Marty

Marty
June 22nd, 2015, 06:23 AM
Hi All;

I found my Dos manual, so I know some commands.. It is missing some pages, so the Basic Dos Pages are missing for these commands..
But, I know about MNT, DIR and RUN..

24898

Possibly, I can attach my Second Drive, and Maybe fix my Burcon CPM Diskette, I would just need to figure out How to do that..

THANK YOU Marty

deramp5113
June 22nd, 2015, 07:03 AM
Marty,

Burcon CP/M for the Altair is typically configured at 59K (really 60K, 1K of headroom just in case). Do you have 60K of RAM in the machine you're using?

Mike

leiy
June 23rd, 2015, 03:05 AM
Hi All;

I just got my Altair out, and Re-configured it, for Altair use, instead of Z-80 and FDC..

Here is a Picture of it, with one Drive, the Second Drive is still put away..

24873

Leiy, I will try to get it up to speed like what You are doing..

24876

My copy of Burcon CPM 2.2 does not work, it just keeps on scrolling the Sign-on message,
But, my MITS DOS ver. 1.0 does work, I only need to find the Manual for it, to find out what commands it accepts..

24883 24884

THANK YOU Marty

Nice try!

Thanks Marty.

leiy
June 23rd, 2015, 03:11 AM
Leiy,

While you wait on hard sector floppies, your FDC+ will work with soft sector floppies and make them look like hard sector floppies. It does this by syncing to the rotational rate of the drive and generating sector pulses on the fly. You'll even see the pulses on the front panel lights as described in Note 3 in the test you just ran.

Mike

Thanks for advice, the bare PCB need soldering, I will try when I get spare time.

One more problem, I have a 1Mbps usb to serial adapter, I try FDC+ serial drive future but failed, all configuration seems OK, I can't get disk enable in serial drive server.

Marty
June 23rd, 2015, 03:39 AM
Hi All;

A serial to USB converter does not work with the Altair, just like the DEC machines..
You need a true Serial computer port for it to work..

THANK YOU Marty

tkc8800
June 23rd, 2015, 02:47 PM
Hi All;

A serial to USB converter does not work with the Altair, just like the DEC machines..
You need a true Serial computer port for it to work..

THANK YOU Marty

They do work. I use two usb to serial adapter cables with my Altair, they work both with the Altair serial cards: 88-2SIO, SSMIO4 and I've also used them with the FDC+ serial server. The FDC+ serial port uses very high baud rates: 403.2k (default), or 460.8k or 230.4k. Make sure the pc you're using can support these baud rates. You might want to try all three baud rates and see if any of them work.

To get the FDC+ serial server working, I start the program on the pc and load a disk image prior to powering up the Altair. Once the Altair is powered up, examine the disk boot loader and run. That usually works for me.

Corey986
June 24th, 2015, 02:35 AM
Marty,

With USB to serial adapters, you could have a few problems besides needing more signals crossed over. First is the voltage may not work. USB to serial usually use ground not negative and less than 9V not 12V or more RS232 usually sees. Still within spec but not great.

The second and more common is a ground loop. I always use opto isolators with mine to prevent this problem. Learned the hard way with intermittent behavior on my Scelbi when I had a bit bang IO setup.

Cheers,
Corey

Marty
June 24th, 2015, 04:01 AM
Hi All;

OK, USB didn't seem to work with my system.. I have a serial port working, so i'll stick with that..

THANK YOU Marty

TJ_Mossman
June 24th, 2015, 05:29 AM
Hi All;

I just got my Altair out, and Re-configured it, for Altair use, instead of Z-80 and FDC..

Here is a Picture of it, with one Drive, the Second Drive is still put away..

24873



THANK YOU Marty

Marty, what's the story behind the paintjob and rackmounting?

Marty
June 24th, 2015, 07:41 AM
Hi All;

Mike, "" Burcon CP/M for the Altair is typically configured at 59K (really 60K, 1K of headroom just in case). Do you have 60K of RAM in the machine you're using? ""
I actually have a 64K Memory Board that uses 6116's, 32 of them.. It is configured to opt out at F000h and above, for the Altair 1702 Prom Board..
But, I found it has a Bad ram by running the Mits Ram test program, at 154000 Octal it fails.. So, that possibly is why my CPM fails.. I need to find the correct 6116 and replace it and see if that takes care of the problem..

"" Marty, what's the story behind the paintjob and rackmounting? ""
What Paintjob are You refering to ?? As far as Rackmounting and possibly the Paintjob it is How I got the machine when I bought it.. So, I don't know who put them on.. The Altair Serial Number is -- 220687K.. So, It was a kit and maybe the original owner put them on..

24953 24954

Sorry about the Serial Number picture, if I don't put my finger over the flash it white's out the picture..
The Ram Board is a Tanner Computers 1981 64K Static Ram Board..
I found a Jumper for Ram number 28 was not jumpered correctly.. I will retest it..

It Passed !! And it boot's CPM !!!!!!! Sorry about the focus, camera said it was OK, I most likely moved, when pressing the botton..

24955

THANK YOU Marty

Marty
June 29th, 2015, 04:34 AM
Hi All;

I have been diasecting some of the Disk based part of Altair Disk Basic 5.0, as I have an old program that was a monitor based on the Processor Technology stuff, using their Cassette based Cutter and I/O Boards.. Rewritten for the Altair, and it has a small section written for the Altair Disk, Part of which was taken from the Altair Basic Manual.. And so it is only partially done, I think it was not totally finished.. It does read and write Track and Sectors..
Anyway, I have the hex listing for Altair Disk Basic 5.0 and I am Dis-assembling the Disk Routines.. Until, I loose interest, but for now while I am lying on some Ice for some of the last week and for some of this week, it gives me something to do.. And having it on Paper really helps me..
I also have Altair Basic 3.2 in 4K and 8K, and Extended (12K).. I have Altair Basic in Extended 4.0 and Altair Disk Basic 5.0 ..
So, I can compare the different versions (that I have) with each other.. The Extended 4.0 and Disk 5.0 are alot alike..
The Altair Basic 3.2 is fully Dis-assembled as a reference and I have a copy of the 4K online dis-assembled version as well..
So this should keep me out of trouble this week..

THANK YOU Marty

leiy
July 2nd, 2015, 07:36 PM
Hi All;

Mike, "" Burcon CP/M for the Altair is typically configured at 59K (really 60K, 1K of headroom just in case). Do you have 60K of RAM in the machine you're using? ""
I actually have a 64K Memory Board that uses 6116's, 32 of them.. It is configured to opt out at F000h and above, for the Altair 1702 Prom Board..
But, I found it has a Bad ram by running the Mits Ram test program, at 154000 Octal it fails.. So, that possibly is why my CPM fails.. I need to find the correct 6116 and replace it and see if that takes care of the problem..

"" Marty, what's the story behind the paintjob and rackmounting? ""
What Paintjob are You refering to ?? As far as Rackmounting and possibly the Paintjob it is How I got the machine when I bought it.. So, I don't know who put them on.. The Altair Serial Number is -- 220687K.. So, It was a kit and maybe the original owner put them on..

24953 24954

Sorry about the Serial Number picture, if I don't put my finger over the flash it white's out the picture..
The Ram Board is a Tanner Computers 1981 64K Static Ram Board..
I found a Jumper for Ram number 28 was not jumpered correctly.. I will retest it..

It Passed !! And it boot's CPM !!!!!!! Sorry about the focus, camera said it was OK, I most likely moved, when pressing the botton..

24955

THANK YOU Marty

HI Marty.

Good information about the serial and the nice working Altair!

I have updated my Altair 8800 rev.0 survivor list. http://www.vintage-computer.net/?p=144

I'm curious about the "tilt trail" front panel, is it replaced later by original owner or not???

Thank you.
Leiy.

Marty
July 3rd, 2015, 04:36 AM
Hi All;

Leiy, I have No idea what You are referring to or about.. I don't know what a Tilt Trail is..
"" I'm curious about the "tilt trail" front panel, is it replaced later by original owner or not??? ""
But, the Front Panel is How I received it, except for the Paper Strip along the bottom, It did not come with one and the one I have is a generic copy, but not a Raised one like the original..

THANK YOU Marty

Marty
July 4th, 2015, 10:53 AM
Hi All;

"" Marty, what's the story behind the paintjob and rackmounting? "'
I finally realized what Paintjob You were referring to, the Original Altair was Light Blue and White and mine is Black and Rackmounted..
And I really have no answer, except that was the way I got it..

I just missed out on an Altair, my friend saw it by a clothing collection point, and called me on the phone, by the time I had gotten there, someone else had come and took it.. So, I suspect it will show up on Epay for a large amount, coming from this area.. It was the Box and one Board..

THANK YOU Marty

leiy
July 4th, 2015, 10:34 PM
I can enable the serial drive manually use code below:

000000 076
000001 000
000002 323
000003 010
000004 076
000005 004
000006 323
000007 011
000010 333
000011 011
000012 333
000013 010

http://www.vintage-computer.net/bbsupload/sn221148a/fdc/serial.png

But I can't use disk boot loader to load disk image, when I set address & examine FF00, nothing happen when I hit run switch, both light on the serial drive soft window not turn to red.

Any help about this problem? Thanks.

Here's my fdc+ switch setting.

http://www.vintage-computer.net/bbsupload/sn221148a/fdc/fdc.jpg

deramp5113
July 5th, 2015, 05:24 AM
Based on the switch settings, I assume you have no other RAM or ROM in the system - is that correct?

After single stepping through the code you list, was the "Head Load" light on as well?

What is the "Z:, drive? If "Z:" is a network or USB drive, try running with the disk image on your "C:" drive.

Mike

Marty
July 5th, 2015, 05:42 AM
Hi All;

What is the Board that is behind the FDC+ Board, and If it is an I/O type of Board, What Ports is it set to ??
Is there a conflict of interest, between it and something else ??

THANK YOU Marty

leiy
July 5th, 2015, 06:31 AM
Based on the switch settings, I assume you have no other RAM or ROM in the system - is that correct?

After single stepping through the code you list, was the "Head Load" light on as well?

What is the "Z:, drive? If "Z:" is a network or USB drive, try running with the disk image on your "C:" drive.

Mike

No other RAM or ROM in in the system.

And yes, after single stepping through the code, the "Head Load" light is on.

The "Z" drive is a software emulated virtual drive. Thanks for the advice, I will try tomorrow.

leiy
July 5th, 2015, 06:49 AM
Hi All;

What is the Board that is behind the FDC+ Board, and If it is an I/O type of Board, What Ports is it set to ??
Is there a conflict of interest, between it and something else ??

THANK YOU Marty

Is a 88-4 PIO board, the board pin is insulated from the edge connector. I will examine the jumper wire on the board to figure out what ports is it set to.

leiy
July 5th, 2015, 08:15 PM
Hi All;

Leiy, I have No idea what You are referring to or about.. I don't know what a Tilt Trail is..
"" I'm curious about the "tilt trail" front panel, is it replaced later by original owner or not??? ""
But, the Front Panel is How I received it, except for the Paper Strip along the bottom, It did not come with one and the one I have is a generic copy, but not a Raised one like the original..

THANK YOU Marty

I move the file to C: drive, nothing happened, the both light not turn to red.

Could you send me disk boot loader code in Octal? I can enter DBL manually to test out.

Thank you.
Leiy.

Marty
July 6th, 2015, 04:16 AM
Hi All;
Leiy, Yes, I can, my system displays it in Hex, so I will need to copy it as Hex first and then convert it to Octal.. This may take awhile..
Then I can take some pictures of it for You, and You can tell me if it is legible enough for You to Read..
I will be adding pictures as I write out each Page..

25153 25154


25155 25156

Half way there..

THANK YOU Marty

Marty
July 6th, 2015, 05:47 AM
Hi All;

The last half..

25157 25158


25159 25160



25161


THANK YOU Marty

deramp5113
July 6th, 2015, 07:52 AM
Leiy,

Is the server running on a normal, fairly recent PC? Or is it an old machine, or a virtual machine on a Mac or something like that?

It is very unlikely the problem is with the boot loader in the EPROM on the FDC+.

As detailed in Appendix B of the FDC+ manual, the boot ROM code at FF00 is actually Martin Eberhard's "combined" DBL code (CDBL) that can boot either an 8" floppy or the minidisk. You can find out more about CDBL at:

http://deramp.com/downloads/index.php?dir=altair%2Fsoftware%2Froms%2Fupdated_r oms%2FM+Eberhard+Improved+ROMs%2F

The original Altair DBL (8" only) can be found at:

http://deramp.com/downloads/index.php?dir=altair%2Fsoftware%2Froms%2Forginal_r oms%2F

I'd run the Altair floppy disk exerciser program (AFEXER) which can be used to manual select a drive, load the head, step, etc., so you could see if these actions reflect on the server program. You can find AFEXER at:

http://deramp.com/downloads/index.php?dir=altair%2Fsoftware%2Futilities%2Fflop py_disk%2F

You can use the Intel hex loader in ROM to load AFEXER.HEX. Examine FC00 on the front panel and depress RUN. You should see a prompt to send the hex file. Send AFEXER.HEX using simple text transfer (i.e., not XMODEM). When the transfer completes, hold up STOP and raise RESET, then examine the start address of the program, 0100h, and depress run. When prompted at startup, choose the 8 inch drive type. From there, you can simply press return at the command prompt to see a list of commands.

On the server, mount an 8" drive images on both drives 0 and 1.

Type "D 0" C/R to select drive zero. The drive zero select light should come on.
Type "D 1" C/R to select drive one, the drive one select light should come on and the drive zero light should go out.
Type "R" C/R to restore to track 0.
Type "S 30" C/R to seek to track 30. The track number should quickly increment to 30.

You can then switch back to drive zero and run similar commands. Do these operations seem to work?

Mike

Marty
July 11th, 2015, 08:28 AM
Hi All;

I got all of Altair Disk Basic 5.0 copied on to paper, I still need to make the Jump, Call, Etc., list.. And finish Dis-assemble what I have copied so far.. And sometime in the Future do the same for the Rest of the versions, Altair Extended Basic 4.0 and 4.1 and Altair Disk Basic 4.0.. But, I am copied out for now..

THANK YOU Marty

leiy
July 21st, 2015, 02:20 AM
Hi,

Marty and deramp5113, quite thanks for help, I will try next few days.

leiy
September 27th, 2015, 06:32 PM
Leiy,

Is the server running on a normal, fairly recent PC? Or is it an old machine, or a virtual machine on a Mac or something like that?

It is very unlikely the problem is with the boot loader in the EPROM on the FDC+.

As detailed in Appendix B of the FDC+ manual, the boot ROM code at FF00 is actually Martin Eberhard's "combined" DBL code (CDBL) that can boot either an 8" floppy or the minidisk. You can find out more about CDBL at:

http://deramp.com/downloads/index.php?dir=altair%2Fsoftware%2Froms%2Fupdated_r oms%2FM+Eberhard+Improved+ROMs%2F

The original Altair DBL (8" only) can be found at:

http://deramp.com/downloads/index.php?dir=altair%2Fsoftware%2Froms%2Forginal_r oms%2F

I'd run the Altair floppy disk exerciser program (AFEXER) which can be used to manual select a drive, load the head, step, etc., so you could see if these actions reflect on the server program. You can find AFEXER at:

http://deramp.com/downloads/index.php?dir=altair%2Fsoftware%2Futilities%2Fflop py_disk%2F

You can use the Intel hex loader in ROM to load AFEXER.HEX. Examine FC00 on the front panel and depress RUN. You should see a prompt to send the hex file. Send AFEXER.HEX using simple text transfer (i.e., not XMODEM). When the transfer completes, hold up STOP and raise RESET, then examine the start address of the program, 0100h, and depress run. When prompted at startup, choose the 8 inch drive type. From there, you can simply press return at the command prompt to see a list of commands.

On the server, mount an 8" drive images on both drives 0 and 1.

Type "D 0" C/R to select drive zero. The drive zero select light should come on.
Type "D 1" C/R to select drive one, the drive one select light should come on and the drive zero light should go out.
Type "R" C/R to restore to track 0.
Type "S 30" C/R to seek to track 30. The track number should quickly increment to 30.

You can then switch back to drive zero and run similar commands. Do these operations seem to work?

Mike

Only after running AFEXER, I can get FDC+ serial drive function properly

Thank you