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ldkraemer
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ldkraemer
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March 13th, 2013
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February 25th, 2021
06:25 AM
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Today,
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...
see more
0 replies | 72 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,...
see more
33 replies | 2083 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...
see more
33 replies | 2083 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 | 2083 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...
see more
33 replies | 2083 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...
see more
2 replies | 43 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...
see more
39 replies | 1771 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...
see more
9 replies | 218 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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9 replies | 218 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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9 replies | 218 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-
see more
9 replies | 218 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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9 replies | 218 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
9 replies | 218 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. ...
see more
19 replies | 504 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 | 291 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 | 291 view(s)
February 6th, 2021,
06:30 AM
ldkraemer
replied to a thread
How to back up TI-99/4A disks?
in
Texas Instruments
Your ftp://ftp.whtech.com/ requires a login...... Try: http://www.whtech.com/ti/ http://ftp.whtech.com/ ...
see more
4 replies | 263 view(s)
February 3rd, 2021,
05:00 PM
ldkraemer
replied to a thread
RTS80 Model IV disk problems
in
Tandy/Radio Shack
I always use a few drops of Dri-Slide a Motorcycle cable lubricant that does not attract dirt. I also use a few drops on scanner rails. The...
see more
8 replies | 301 view(s)
February 3rd, 2021,
05:48 AM
ldkraemer
replied to a thread
Shugart SA400 external drive on AVL Eagle I not cooperating
in
CP/M and MP/M
If you have a CP/M Computer that you can connect the Floppy Drive to, you can use DU-89.ZIP to step the Floppy drive to various tracks and see what...
see more
4 replies | 191 view(s)
February 2nd, 2021,
04:40 AM
ldkraemer
replied to a thread
RTS80 Model IV disk problems
in
Tandy/Radio Shack
JonB, I've found that Tandon TM-100-x's have the two Caps on the RPM board that leak and the acid eats up the PCB traces for the RPM Board. I've...
see more
8 replies | 301 view(s)
January 31st, 2021,
09:29 AM
clh333
replied to a thread
Following on Sparky: 1400 HD
in
Tandy/Radio Shack
The daughter board in question is the controller for the 20 MB Alps HD. There wasn't much information available about the Alps drive or its...
see more
9 replies | 286 view(s)
January 29th, 2021,
11:35 AM
clh333
replied to a thread
Following on Sparky: 1400 HD
in
Tandy/Radio Shack
I'm not well-versed in SMT but after some YouTube instruction I managed to remove the small capacitors. The board underneath was a mess but I...
see more
9 replies | 286 view(s)
January 28th, 2021,
01:10 PM
clh333
replied to a thread
Following on Sparky: 1400 HD
in
Tandy/Radio Shack
Modem slot is on the other side of the bay - RHS viewed from rear. A cable comes up from the motherboard and is fixed in place with a slot facing...
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9 replies | 286 view(s)
January 28th, 2021,
11:53 AM
clh333
replied to a thread
Following on Sparky: 1400 HD
in
Tandy/Radio Shack
Addressing leaky capacitors I come across the following on the mezzanine board: Topside at C1 and C4 are small 22uF 35V capacitors that have...
see more
9 replies | 286 view(s)
January 28th, 2021,
10:52 AM
clh333
replied to a thread
Following on Sparky: 1400 HD
in
Tandy/Radio Shack
Thank you for the information. I have some familiarity with the concept as I have XT-IDEs built from glitch's kits which are deployed in a couple of...
see more
9 replies | 286 view(s)
January 28th, 2021,
08:39 AM
clh333
replied to a thread
Following on Sparky: 1400 HD
in
Tandy/Radio Shack
Mezzanine board under the HD was the restriction. Motherboard out shows signs of leaky caps as does PSU; base tray may be repairable. HD is an...
see more
9 replies | 286 view(s)
January 28th, 2021,
06:40 AM
ldkraemer
replied to a thread
TRS-80 Model 1 ROM adapter supporting 4 banks
in
Tandy/Radio Shack
Just curious if your Model 1 rev G Motherboard had Version 1.3 ROMS. I updated my Older Model 1 from Ver 1.1 ROMS to Ver 1.3 ROMS to get rid of...
see more
5 replies | 411 view(s)
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About ldkraemer
Basic Information
About ldkraemer
Biography:
Electronic Technician
Location:
Chaffee, MO
Interests:
Computers, Hardware, Troubleshooting
Occupation:
Retired
Statistics
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Total Posts
1,678
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General Information
Last Activity
February 25th, 2021
06:25 AM
Join Date
March 13th, 2013
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