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daver2
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daver2
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Today,
09:16 AM
daver2
replied to a thread
SBC6120 - IOB6120 FLASH trouble
in
DEC
>>> Don't I just issue the 6410 IOT which takes the contents of ACC and pokes that out on the data bus. Yes, but the signal will only be active...
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15 replies | 492 view(s)
Today,
06:08 AM
daver2
replied to a thread
SBC6120 - IOB6120 FLASH trouble
in
DEC
>>> I subsequently reprogrammed the Lattice GAL22V10B successfully to match Bob's original IOT2.jed. The trouble is that you may now have...
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15 replies | 492 view(s)
Today,
05:40 AM
daver2
replied to a thread
Apple ][+ rolling video started today
in
Early Apple (I, ][, ///, etc.)
The thing to watch out for with 4164 DRAM is whether they are 128 or 256 cycle refresh devices. 128 cycle DRAM will work in place of 256 cycle...
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7 replies | 84 view(s)
Today,
03:26 AM
daver2
replied to a thread
Apple ][+ rolling video started today
in
Early Apple (I, ][, ///, etc.)
I checked the online schematics and the ICs referenced (B14 and C11) are the types as specified. There must be at least two (2) revisions of the...
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7 replies | 84 view(s)
January 22nd, 2021,
07:21 AM
daver2
replied to a thread
Aim-65 video card mystery
in
Vintage Computer Hardware
I see you have found some DIN connectors. If you run out, I may have access to some. I think I have right-angled male plugs (solder type) and...
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32 replies | 532 view(s)
January 22nd, 2021,
07:15 AM
daver2
replied to a thread
Memory problem with PET 2001
in
Commodore
Assuming RDx is the RAM Data, then the logic analyser is indicating potential problems somewhere... Unfortunately, a logic analyser is no good for...
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52 replies | 1596 view(s)
January 21st, 2021,
02:52 PM
daver2
replied to a thread
Aim-65 video card mystery
in
Vintage Computer Hardware
Getting there ... Dave
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32 replies | 532 view(s)
January 21st, 2021,
07:58 AM
daver2
replied to a thread
Aim-65 video card mystery
in
Vintage Computer Hardware
This is the best photograph of the top of the buffer board I have been able to find: ...
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32 replies | 532 view(s)
January 21st, 2021,
04:22 AM
daver2
replied to a thread
Memory problem with PET 2001
in
Commodore
I suppose it is also worth pointing out that there are two (2) +5V regulators (and, therefore, two +5V rails) on the PET 2001N. Obviously, both dc...
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52 replies | 1596 view(s)
January 21st, 2021,
03:52 AM
daver2
replied to a thread
Aim-65 video card mystery
in
Vintage Computer Hardware
The AIM-65 is supposed to interface to the serial world via a 20 mA current loop. However, with the addition of an RS232 transmitter buffer, it...
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32 replies | 532 view(s)
January 21st, 2021,
03:02 AM
daver2
replied to a thread
Memory problem with PET 2001
in
Commodore
Post #28 should cover the rail voltages. Worth double-checking them though with an oscilloscope - looking for dc level and ripple/noise. That...
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52 replies | 1596 view(s)
January 20th, 2021,
07:26 AM
daver2
replied to a thread
What did I do to my PDP-8 today.
in
DEC
Tom, Yes, the text "write" appears to be hard-coded where the warning appears - but the previous messages correctly identify the transaction as a...
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152 replies | 10098 view(s)
January 20th, 2021,
12:52 AM
daver2
replied to a thread
Memory problem with PET 2001
in
Commodore
Those traces look fine to me (on a quick check at least). As you can see, triggers are the all important factor with both an oscilloscope and a...
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52 replies | 1596 view(s)
January 19th, 2021,
07:56 AM
daver2
replied to a thread
What did I do to my PDP-8 today.
in
DEC
>>> On my Straight 8, PAL opens the side panel and an arm with an open hand reaches out and slaps the programmer silly. I can think of quite a few...
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152 replies | 10098 view(s)
January 19th, 2021,
07:53 AM
daver2
replied to a thread
What did I do to my PDP-8 today.
in
DEC
There is a file on the disk called CHESS.TXT. Suggest reading it... It is also here...
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152 replies | 10098 view(s)
January 19th, 2021,
04:59 AM
daver2
replied to a thread
What did I do to my PDP-8 today.
in
DEC
There might be a clue here. https://raymii.org/s/articles/Creating_an_OS8_RK05_system_disk_from_RX01_floppies_for_the_PDP-8_with_SIMH.html#toc_2 ...
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152 replies | 10098 view(s)
January 18th, 2021,
01:53 PM
daver2
replied to a thread
Memory problem with PET 2001
in
Commodore
Hi Greg, You need to be a little bit careful with what you are looking at on a scope / logic analyser. You need to know what is happening on the...
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52 replies | 1596 view(s)
January 18th, 2021,
11:57 AM
daver2
replied to a thread
Help with fixing Commodore 2040 Dual Floppy drive
in
Commodore
Forget the drive for now - and concentrate on the PET IEEE port. As I stated back in post #3, we have already gone through a process of...
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8 replies | 103 view(s)
January 18th, 2021,
02:24 AM
daver2
replied to a thread
Help with fixing Commodore 2040 Dual Floppy drive
in
Commodore
There is another very recent thread on the forum where we did exactly this and tested the IEEE port in isolation from anything else. The other...
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8 replies | 103 view(s)
January 18th, 2021,
02:18 AM
daver2
replied to a thread
CBM 8032 - What does the startup chirp actually mean?
in
Commodore
Set ourselves the goal of getting space invaders running! Dave
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157 replies | 7127 view(s)
January 18th, 2021,
02:06 AM
daver2
replied to a thread
Aim-65 video card mystery
in
Vintage Computer Hardware
One of the documents I read yesterday I am sure had the bit patterns for the character generator in it. Dave
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32 replies | 532 view(s)
January 17th, 2021,
01:59 PM
daver2
replied to a thread
CBM 8032 - What does the startup chirp actually mean?
in
Commodore
Well done that man :-)! Have you tested all of the PET functions yet? Do you have a cassette to load space invaders for example!!! We have...
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157 replies | 7127 view(s)
January 17th, 2021,
10:04 AM
daver2
replied to a thread
Aim-65 video card mystery
in
Vintage Computer Hardware
I fired up my AIM-65 emulator this afternoon and I found that it already contained the AIM 65 DOS VERSION 1.0 ROM image. I remember now what the...
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32 replies | 532 view(s)
January 17th, 2021,
08:38 AM
daver2
replied to a thread
Microkit 8/16
in
Other
I was merging the screen display from the other 'half' of the EPROM - but I am not making much sense of it... Can you just confirm the wiring of...
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81 replies | 6075 view(s)
January 17th, 2021,
04:40 AM
daver2
replied to a thread
Aim-65 video card mystery
in
Vintage Computer Hardware
I am guessing (from looking at the photograph) that there are two parts to this. 1. Is an adapter from the expansion bus to a ‘commercial’ bus....
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32 replies | 532 view(s)
January 17th, 2021,
04:35 AM
daver2
replied to a thread
Fun with New AIM-65
in
Vintage Computer Hardware
Nice purchase! Dave
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6 replies | 151 view(s)
January 16th, 2021,
10:38 AM
daver2
replied to a thread
Microkit 8/16
in
Other
I can't answer that question though. Is there a -9V generator on the board? Presumably you can follow the -9V pin(s) from the EPROM to where it...
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81 replies | 6075 view(s)
January 16th, 2021,
10:32 AM
daver2
replied to a thread
What did I do to my PDP-8 today.
in
DEC
Excellent work Tom. Dave
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152 replies | 10098 view(s)
January 16th, 2021,
03:09 AM
daver2
replied to a thread
Can someone help me re-install windows on......
in
General Off Topic
This information is from soooo long ago! Use the Windows Installation disk. Answer the language and time questions. Click Next. Select...
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3 replies | 102 view(s)
January 14th, 2021,
12:01 AM
daver2
replied to a thread
Memory problem with PET 2001
in
Commodore
At 1V/div those traces are even more suspect... We need to ‘poke around’ the databus buffers first... Dave
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52 replies | 1596 view(s)
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SW/HW design engineer
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