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ldkraemer
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ldkraemer
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March 13th, 2013
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Yesterday,
05:22 PM
ldkraemer
replied to a thread
Piccolo RC702 8inch FFD -Boot Problem CP/M
in
Minis and Mainframes
I have extracted all the files in the following Images: DOTEST.RAW GAMES.RAW MBASIC521.RAW WORDSTAR.RAW CPM56K.RAW I can create a ZIP of each...
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9 replies | 122 view(s)
Yesterday,
09:38 AM
ldkraemer
replied to a thread
Piccolo RC702 8inch FFD -Boot Problem CP/M
in
Minis and Mainframes
As an example I started with CPM56K.IMD and created the CPM56K.RAW file, then copied the first 2048 bytes to a new file. Then appended the complete...
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9 replies | 122 view(s)
Yesterday,
06:28 AM
ldkraemer
replied to a thread
Piccolo RC702 8inch FFD -Boot Problem CP/M
in
Minis and Mainframes
Your Original 22DISK definitions: BEGIN RC70 PICCOLO RC702 - DSDD 48 TPI 5,25" DENSITY MFM ,LOW CILINDERS 40 SIDE 2 SECTORS 9,512 SIDE1 0...
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9 replies | 122 view(s)
Yesterday,
05:10 AM
ldkraemer
replied to a thread
Piccolo RC702 8inch FFD -Boot Problem CP/M
in
Minis and Mainframes
If you want to try using a 3.5" Floppy Drive to emulate an 8" Floppy, Marcus Bennett has that information available. While his site is down...
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9 replies | 122 view(s)
March 6th, 2021,
07:51 PM
ldkraemer
replied to a thread
Piccolo RC702 8inch FFD -Boot Problem CP/M
in
Minis and Mainframes
If you have a bootable 5.25" Floppy, you can try using BIN2IMD to write a 8" image from the .RAW image. BIN2IMD input-file output-image ...
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9 replies | 122 view(s)
March 6th, 2021,
06:47 PM
ldkraemer
replied to a thread
Piccolo RC702 8inch FFD -Boot Problem CP/M
in
Minis and Mainframes
For your two Definitions "RC70" & "RC71" the total number of tracks per side is 35 with the total being 70. You can verify this with the Imagedisk...
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9 replies | 122 view(s)
March 4th, 2021,
03:51 AM
ldkraemer
replied to a thread
Help with 8 inch floppy YE-DATA YD-174D
in
PCs and Clones
Fran, Sorry I missed those pictures of the jumpers in the corners of the PCB. And I assumed the red Lines were added Jumpers. Thanks for clearing...
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21 replies | 416 view(s)
March 3rd, 2021,
07:37 PM
ldkraemer
replied to a thread
Help with 8 inch floppy YE-DATA YD-174D
in
PCs and Clones
How about posting closeup photo's of top left Pins and text on PCB, bottom left pins and text on PCB. And close up photo of the PADS 0, 1, 2, 3 with...
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21 replies | 416 view(s)
March 3rd, 2021,
07:13 PM
ldkraemer
replied to a thread
Help with 8 inch floppy YE-DATA YD-174D
in
PCs and Clones
From your Photo #2 in the last post I see you added some red jumpers trying to get the signals to the correct place. Rather than doing that what we...
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21 replies | 416 view(s)
March 3rd, 2021,
02:06 PM
ldkraemer
replied to a thread
Help with 8 inch floppy YE-DATA YD-174D
in
PCs and Clones
It looks to me like your Photo on the Right (PCB) is numbered as follows. The Pin you have as 1 is really 2, as 1 3, 5 are GND. Pin 7 has no Pin in...
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21 replies | 416 view(s)
March 3rd, 2021,
11:29 AM
ldkraemer
replied to a thread
Help with 8 inch floppy YE-DATA YD-174D
in
PCs and Clones
The easiest test would be take your 8" floppy Drive and check Pin 26 of the 50 Pin connector. It will go to the DS1 Jumper for Drive Select. That...
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21 replies | 416 view(s)
March 2nd, 2021,
11:44 AM
ldkraemer
replied to a thread
Help with 8 inch floppy YE-DATA YD-174D
in
PCs and Clones
I found a PNG with the pinout for using Disk Change with 8" Floppy Drive. PC(34p) 8"(50p) Description > 2 TG43 8 ...
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21 replies | 416 view(s)
February 28th, 2021,
04:56 PM
ldkraemer
replied to a thread
Help with 8 inch floppy YE-DATA YD-174D
in
PCs and Clones
Fran, I can't determine if you are using two floppy drives or just the 8" Drive. Plus I've not seen or used the FDADAP Interface Board. I'm...
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21 replies | 416 view(s)
February 28th, 2021,
11:15 AM
ldkraemer
replied to a thread
Help with 8 inch floppy YE-DATA YD-174D
in
PCs and Clones
Fran, Your YE-DATA YD-174D appears to be very similar to the "YD180_~1.PDF" file I downloaded from Bitsavers (PDF). Page 25 describes the...
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21 replies | 416 view(s)
February 27th, 2021,
04:23 AM
clh333
started a thread
The definition of insanity...
in
PCs and Clones
... is doing the same thing over and over and expecting different results. Undeterred, I have acquired another AT&T machine, having bricked two...
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0 replies | 117 view(s)
February 25th, 2021,
06:52 AM
clh333
replied to a thread
S-100 Power Supply Design Question
in
S-100
Never seen an Altair, or an IMSAI, either, for that matter. I considered finding a "legacy" machine but I thought better. Not so much for the cost,...
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33 replies | 2237 view(s)
February 25th, 2021,
05:20 AM
clh333
replied to a thread
S-100 Power Supply Design Question
in
S-100
I dug through the drawers and found a 12VDC 3A switcher that will do for now, mainly just to run the fans. The case I chose - CoolerMaster HAF XB...
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33 replies | 2237 view(s)
February 24th, 2021,
10:46 AM
clh333
replied to a thread
S-100 Power Supply Design Question
in
S-100
Thanks, Rich; makes sense to me. There is plenty of room in this chassis so one more switcher is pretty easily accomplished. And thanks, too, for...
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33 replies | 2237 view(s)
February 24th, 2021,
09:19 AM
clh333
replied to a thread
S-100 Power Supply Design Question
in
S-100
Once again, thank you all for your input. I took on this project for its educational value; I have learned a lot already*. The backplane is...
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33 replies | 2237 view(s)
February 24th, 2021,
06:49 AM
ldkraemer
replied to a thread
Mitsubishi MF501B-318U Jumper Settings
in
Vintage Computer Hardware
Here is a list of the typical jumpers found on assorted Floppy Drives. HC - Head loading is continous HD - Head loading controlled by the Drive...
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5 replies | 119 view(s)
February 18th, 2021,
07:29 PM
ldkraemer
replied to a thread
RX01 floppy drive adventures
in
DEC
I continue to use Dri-Slide, a Motorcycle Cable Lubricant, that does not attract dirt. Just a few drops will lubricate the Head Guide Rails and it...
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40 replies | 2070 view(s)
February 17th, 2021,
03:19 PM
clh333
replied to a thread
RTC for 4D
in
Tandy/Radio Shack
I am in the process of mapping the DS1216 to its carrier; not all DS pins are carried out. The carrier is 28 pin and U4 is 24 pin so the carrier...
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11 replies | 360 view(s)
February 17th, 2021,
05:47 AM
clh333
replied to a thread
RTC for 4D
in
Tandy/Radio Shack
Anti-static, but not conductive, according to the supplier. Also the supplier, McMaster-Carr, notes that the anti-static properties diminish over...
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11 replies | 360 view(s)
February 17th, 2021,
03:11 AM
clh333
replied to a thread
RTC for 4D
in
Tandy/Radio Shack
Thanks for the tip. The foam was sold as anti-static; I'll have to verify that. But I never would have thought of tinfoil. -CH-
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11 replies | 360 view(s)
February 16th, 2021,
03:26 PM
clh333
replied to a thread
RTC for 4D
in
Tandy/Radio Shack
Indeed. This is getting more interesting; thanks again for pointing this out. -CH-
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11 replies | 360 view(s)
February 16th, 2021,
11:51 AM
clh333
replied to a thread
RTC for 4D
in
Tandy/Radio Shack
Tarkie101, I believe you're right, thanks. Not sure the chip can be replaced and battery is most likely dead, but interesting idea. Maybe...
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11 replies | 360 view(s)
February 16th, 2021,
07:22 AM
clh333
started a thread
RTC for 4D
in
Tandy/Radio Shack
Going through a Model 4D motherboard that appears to have suffered some damage through exposure to the elements I found a few "features" that at...
see more
11 replies | 360 view(s)
February 14th, 2021,
04:40 AM
ldkraemer
replied to a thread
Tandon TM-100-2 Track Seeking
in
Vintage Computer Hardware
It shouldn't take long to check the Motor's windings with an OHM Meter, as there is a Plug that disconnects the Motor as shown on the Schematic. ...
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19 replies | 566 view(s)
February 9th, 2021,
07:06 AM
ldkraemer
replied to a thread
Model 4P Scrambled 80 Characters Mode - only when floppy cable connected ??
in
Tandy/Radio Shack
I'd suggest checking the Power Supply(s). I've never worked on a 4P, but the Model 3's and 4's that had the Tandy Power Supply (vs Astec) with a...
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8 replies | 365 view(s)
February 7th, 2021,
06:04 AM
ldkraemer
replied to a thread
Model 4P Scrambled 80 Characters Mode - only when floppy cable connected ??
in
Tandy/Radio Shack
What happens if you leave the Ribbon cable connected to the floppy's and just unplug the Power Cables to both floppy's? Is the video correct? Or...
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8 replies | 365 view(s)
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About ldkraemer
Basic Information
About ldkraemer
Biography:
Electronic Technician
Location:
Chaffee, MO
Interests:
Computers, Hardware, Troubleshooting
Occupation:
Retired
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1,692
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Last Activity
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Join Date
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