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clh333
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clh333
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February 22nd, 2015
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Today,
04:58 AM
clh333
replied to a poll
System architecture for a Z380 TRS-80 compatible.
in
Tandy/Radio Shack
I was following the sage advice: "It is better to keep your mouth shut and be thought a fool than to open it and remove all doubt." But since I have...
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13 replies | 215 view(s)
January 16th, 2021,
01:08 PM
clh333
replied to a thread
70 Mb HD Documentation Needed
in
Tandy/Radio Shack
Thank you Mr. G.: Two more places I never knew existed. I'll have to look more closely at the bulb to verify its specs (I will need a magnifier...
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10 replies | 686 view(s)
January 16th, 2021,
11:19 AM
clh333
replied to a poll
System architecture for a Z380 TRS-80 compatible.
in
Tandy/Radio Shack
Z380, CPLD, bus extension / expansion. (my 2c)
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13 replies | 215 view(s)
January 16th, 2021,
09:50 AM
clh333
replied to a thread
70 Mb HD Documentation Needed
in
Tandy/Radio Shack
Another issue: The front panel indicator lights (two green one red) are Taiko K-16 S0 manufacture. The lamp, nominally 24VDC, is an unusual "grain...
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10 replies | 686 view(s)
January 16th, 2021,
08:14 AM
ldkraemer
replied to a thread
Kaypro 10 / MTS / Kaypro 1 81-478-A ROM reloading issues, please advise?
in
CP/M and MP/M
TJ, You can use cpmtools (or cpmtools built with libdsk) to access the Files and get directory listings. $ TD02IMD K10U-RLD.TD0 > K10U-RLD.TXT...
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29 replies | 295 view(s)
January 15th, 2021,
02:55 PM
ldkraemer
replied to a thread
Help, I am lookin for a modifacation for my model 1 system
in
Tandy/Radio Shack
Yes, it is easy. PM me your email address and I'll send you the Document. Larry
see more
5 replies | 149 view(s)
January 15th, 2021,
09:37 AM
clh333
replied to a thread
70 Mb HD Documentation Needed
in
Tandy/Radio Shack
Correction: This is a Micropolis 1325, which makes it a 70 Mb MFM drive, as Al Kossow suggested. I may have damaged the drive surface by turning...
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10 replies | 686 view(s)
January 15th, 2021,
06:34 AM
ldkraemer
replied to a thread
Help, I am lookin for a modifacation for my model 1 system
in
Tandy/Radio Shack
Rick, So, you are going to use a stock Model 1 keyboard, and the EI that has zero memory installed. If so, then all you need to do is add the two...
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5 replies | 149 view(s)
January 15th, 2021,
02:47 AM
ldkraemer
replied to a thread
Help, I am lookin for a modifacation for my model 1 system
in
Tandy/Radio Shack
Rick, Your best bet is to keep the 64K RAM IC's in the Keyboard and not add any memory to the EI. The 64K RAM is a lit better than the Older RAM...
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5 replies | 149 view(s)
January 14th, 2021,
12:30 PM
clh333
replied to a thread
70 Mb HD Documentation Needed
in
Tandy/Radio Shack
After a lengthy siesta, back to this topic: The attached pictures illustrate the non-standard wiring and modifications to that non-standard wiring...
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10 replies | 686 view(s)
January 14th, 2021,
02:56 AM
ldkraemer
replied to a thread
Commodore 1541 drive can't format or read disks
in
Commodore
What is the Device Number of the Drive? 8, 9, 10, 11 ?? After you format the Floppy, Did you Initialize it? What was the Read Error? Send...
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8 replies | 128 view(s)
January 13th, 2021,
02:30 PM
clh333
replied to a thread
Soldering station heating element replacement
in
Vintage Computer Tools
I obtained a Hakko 1321 heating element and installed it in the Zeny iron. The specs are the same and the leads are long enough but the Hakko board...
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3 replies | 192 view(s)
January 12th, 2021,
03:14 PM
ldkraemer
replied to a thread
Problem with Expansion Interface
in
Tandy/Radio Shack
Rick, I have no knowledge of what the FreHD auto boot ROMS do. I think you need Ian involved. Larry
see more
4 replies | 127 view(s)
January 12th, 2021,
08:23 AM
ldkraemer
replied to a thread
Problem with Expansion Interface
in
Tandy/Radio Shack
Rick, Can you answer the following questions? 1. What version ROM is in your model 1? ver 1.1 or 1.3? 2. Do you know if it is the 3 ROM set or...
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4 replies | 127 view(s)
January 7th, 2021,
12:03 PM
clh333
replied to a thread
Model 4P First Questions
in
Tandy/Radio Shack
After a few twists and turns I have the machine back together, having rebuilt the PSU, added another 64k memory and repaired or replaced the Tandon...
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9 replies | 558 view(s)
January 6th, 2021,
02:09 PM
clh333
replied to a thread
Soldering station heating element replacement
in
Vintage Computer Tools
Thank you for the suggestion; I think maybe not. I have ordered a couple of HAKKO elements after inspecting the Yihua and researching its specs. ...
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3 replies | 192 view(s)
January 5th, 2021,
01:32 PM
clh333
started a thread
Soldering station heating element replacement
in
Vintage Computer Tools
Sorry for asking another dumb question but this is my first time through this problem. Graduated from the "pencil" soldering iron (Radio Shack...
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3 replies | 192 view(s)
January 4th, 2021,
05:20 PM
ldkraemer
replied to a thread
Model 4 Non-GA Garbage at power on
in
Tandy/Radio Shack
Bill, I'd just go back and check A{0..15} using the Pullup Resistor and checking the HIGH and LOW Voltages on the Address Lines to the ROM(s). If...
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61 replies | 4058 view(s)
January 4th, 2021,
06:30 AM
ldkraemer
replied to a thread
Model 4 Non-GA Garbage at power on
in
Tandy/Radio Shack
Bill, The replay from David was years ago and I had saved it in a Note under my Model 1 folder. Sorry for the confusion. Try holding down the...
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61 replies | 4058 view(s)
January 4th, 2021,
06:16 AM
ldkraemer
replied to a thread
Kaypro 4/84
in
CP/M and MP/M
Here is a bit more information I OCR'd. CHARACTER ROM D3 A 2716 (2K x 8) EPROM is used to store the dot information for every character...
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4 replies | 239 view(s)
January 3rd, 2021,
04:26 AM
ldkraemer
replied to a thread
Tandy 1000 EX Gotek
in
Tandy/Radio Shack
I've created three screenshots of the Floppy layout and the dummy disk screenshot. Also exported the *.HFE file for booting on the GOTEK...
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2 replies | 244 view(s)
January 3rd, 2021,
03:19 AM
clh333
replied to a thread
Linux: Upgrade version or reinstall?
in
General Off Topic
Just yesterday I upgraded one of the machines from Fedora 32 to Fedora 33. Because of its location it had been receiving update by wi-fi, but the...
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56 replies | 3472 view(s)
January 2nd, 2021,
03:27 AM
clh333
replied to a thread
Need TRS-80 Model IV software on disk!
in
Tandy/Radio Shack
Ian Mavric offers software on disk for several different TRS Models. See: http://members.iinet.net.au/~ianmav/trs80/ -CH-
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4 replies | 271 view(s)
December 31st, 2020,
08:23 AM
ldkraemer
replied to a thread
Model 4 Non-GA Garbage at power on
in
Tandy/Radio Shack
Bill, I'm 99% sure you have the problem fixed with the HIGH on A6 with a LOW on the Input as shown by the following SN74LS244 Photo. Larry
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61 replies | 4058 view(s)
December 31st, 2020,
06:50 AM
ldkraemer
replied to a thread
Model 4 Non-GA Garbage at power on
in
Tandy/Radio Shack
Bill, I found a previous note that David Miltimer had posted about {A7..A15} for the Model 1. I had forgotten about it, until I was searching for...
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61 replies | 4058 view(s)
December 31st, 2020,
06:32 AM
ldkraemer
replied to a thread
Fred the Floppy's Repair Log (8050M)
in
Commodore
Lithium Grease will attract Dirt/Dust. Why not use some Dri-Slide (a Motorcycle cable lubricant that does not attract dirt/dust)? It available at...
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37 replies | 1437 view(s)
December 29th, 2020,
05:32 AM
ldkraemer
replied to a thread
Hi from Spokane, WA
in
Introductions
Bo Zimmerman has lots of Commodore Info here: http://www.zimmers.net/ http://www.zimmers.net/commie/index.html...
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2 replies | 217 view(s)
December 28th, 2020,
03:02 PM
ldkraemer
replied to a thread
Model 1 Video RAM issue(s)
in
Tandy/Radio Shack
Let's start with the first screen and understand it. It is as follows: MEM@SIZE @@@@@@@@ which has 7 spaces between the two character strings...
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2 replies | 182 view(s)
December 28th, 2020,
04:24 AM
ldkraemer
replied to a thread
PC XT Power Supply Repair
in
PCs and Clones
Here are a couple Schematics I found somewhere on the Internet. It has the same Transistors. AT_compow11.gif ATX_psu_schematic.pdf Send me a...
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15 replies | 941 view(s)
December 26th, 2020,
06:30 AM
ldkraemer
replied to a thread
Osborne 1 "BOOT ERROR" on Drive A: only, help diagnosing..
in
CP/M and MP/M
The Drive Select Signals originate from Sheet 5 Area B5 and go to Sheet 9 Area A8. Larry
see more
2 replies | 181 view(s)
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About clh333
Basic Information
About clh333
Biography:
73 years old, been involved in personal computers since 1982. Kaypro, Commodore, Atari and PCs.
Location:
Cleveland, OH, USA
Interests:
Electronics, Golf, Boating
Occupation:
Was: Information Technology. Now: retired
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February 22nd, 2015
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ldkraemer
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