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clh333
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clh333
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04:49 AM
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ldkraemer
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Yesterday,
02:17 PM
ldkraemer
replied to a thread
Anyone know how to capture Motorola MCM6832 mask ROMs with a Data I/O Unipak?
in
Vintage Computer Hardware
Monty, It should be no big deal. The MCM68A332 is pin compatible with the MCM68766, with the exception of Pins 20 & 21. These are the Chip Select...
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2 replies | 69 view(s)
Yesterday,
09:06 AM
ldkraemer
replied to a thread
Transfering .dsk files to floppies (Tiki-100 CP/M)
in
CP/M and MP/M
The Tiki .dsk file should be the same as a .RAW (Sector Dump) of the Floppy. I have the following .zip files for the Tiki: 94695 Jun 2 ...
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1 replies | 65 view(s)
October 14th, 2019,
07:06 AM
ldkraemer
replied to a thread
Copy II PC Formats
in
Vintage Computer Software
This was very interesting, so I downloaded the LARGE ZIP file, and had a look at the BPB area of KQ1PC.IMG. KQ1PC.IMG 00000000 E8 B7 01 EB ...
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18 replies | 283 view(s)
October 13th, 2019,
05:16 AM
ldkraemer
replied to a thread
Cheat on driving long OC loads?
in
General Off Topic
Chuck, Google isn't locating the 74HCT760 Datasheet for me. Was there a typo? If you have the 74HCT760 Datasheet will you upload it? Thanks. ...
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8 replies | 145 view(s)
October 2nd, 2019,
03:16 PM
ldkraemer
replied to a thread
Northstar Advantage advice please.
in
CP/M and MP/M
Ian, GREAT NEWS! Glad it worked properly. Yes, send it to Al at Bitsavers to preserve. Larry
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54 replies | 1890 view(s)
October 1st, 2019,
10:37 AM
ldkraemer
replied to a thread
Modern TRS-80 Model 1 clone project
in
Tandy/Radio Shack
Glen, Your Character ROM for the Model 1 appears the same as the Motorola MCM6670 Documentation. My Original ROM had that crazy "Flying a" until I...
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6 replies | 762 view(s)
September 29th, 2019,
04:00 PM
ldkraemer
replied to a thread
Model 1 Level II bad video. Also Level 1 no video.
in
Tandy/Radio Shack
Frank, I've got the same problem......getting OLD. I have some Thermal Paste somewhere and still haven't found it. Larry
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3 replies | 152 view(s)
September 29th, 2019,
01:00 PM
ldkraemer
replied to a thread
Model 1 Level II bad video. Also Level 1 no video.
in
Tandy/Radio Shack
Frank, If the Model 1 is a Level II ROM, then All Jumpers on X3 (Z3) need to be shorted. I use a 8 Position DIP Switch instead of the dip jumper...
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3 replies | 152 view(s)
September 26th, 2019,
06:01 AM
ldkraemer
replied to a thread
KayPLUS Kaypro 2X: Boot disk image needed
in
CP/M and MP/M
If you are refering to the Drivetec Floppy drives that were on a few of the Kaypro's (as the MICROcode Disk Format) I found this information in the...
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4 replies | 179 view(s)
September 25th, 2019,
04:14 PM
ldkraemer
replied to a thread
8 inch floppy drives not working!?
in
Vintage Computer Hardware
Do you have the PDF page for the Floppy Jumpers that are required? PM me with your email address. Larry
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7 replies | 227 view(s)
September 24th, 2019,
01:13 PM
ldkraemer
replied to a thread
Northstar Advantage advice please.
in
CP/M and MP/M
Ian, No Problem. I didn't even look at the correct file the first time I posted, and had several mistakes in the HEX BYTES. But, that was because...
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54 replies | 1890 view(s)
September 24th, 2019,
10:21 AM
ldkraemer
replied to a thread
Northstar Advantage advice please.
in
CP/M and MP/M
Yes, but the 63S141 Datasheet shows a 1K size of 4 Output bits each. And 256 * 4 is 1024 = 1K and with {A0..A7} that is 8 Pins for Address...
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54 replies | 1890 view(s)
September 23rd, 2019,
06:46 PM
ldkraemer
replied to a thread
Northstar Advantage advice please.
in
CP/M and MP/M
Ian, I was in a hurry to get to Granddaughter's Volleyball game, and I looked at the 60 HZ file. SORRY! Here is the corrected 50 HZ file. I'm...
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54 replies | 1890 view(s)
September 23rd, 2019,
01:52 PM
ldkraemer
replied to a thread
Northstar Advantage advice please.
in
CP/M and MP/M
Ian, I believe you have the file incorrect. Look at the left column, and it is noted as a Hexidecimal address. {00..32} HEX are 0x02 You HEX...
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54 replies | 1890 view(s)
September 21st, 2019,
03:11 PM
ldkraemer
replied to a thread
Northstar Advantage advice please.
in
CP/M and MP/M
There is a 63S141 on Ebay, but it is expensive. https://www.ebay.com/itm/1-x-63S141J-Fuse-Programmable-PROM-MMI-CDIP-16-1pcs-/162446337397 ...
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54 replies | 1890 view(s)
September 21st, 2019,
04:44 AM
ldkraemer
replied to a thread
Northstar Advantage advice please.
in
CP/M and MP/M
Should be able to use these equivalents for the 63S141: 256x4 Fujitsu 7114TS SIG 82S129 AMD 27S21 MMI 6301, 63S141J NAT 74S287 TI 24S10,...
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54 replies | 1890 view(s)
September 18th, 2019,
01:38 PM
ldkraemer
replied to a thread
TRS-80 III and 4 part interchangability?
in
Tandy/Radio Shack
MrArgent, I sure hope you checked the Solder Joints on the J2 Connector too. Those are prone to getting a thin ring around them where the solder...
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6 replies | 372 view(s)
September 18th, 2019,
01:27 PM
ldkraemer
replied to a thread
Spacers for model 1 units
in
Tandy/Radio Shack
Why don't you add a bit of documentation, with the original source files, and post on thingiverse. The Source files are nice to include because not...
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12 replies | 1459 view(s)
September 17th, 2019,
02:46 PM
ldkraemer
replied to a thread
TRS-80 III and 4 part interchangability?
in
Tandy/Radio Shack
If you clean those pins good, then insert them in the PCB, they should solder properly. You will need to flux the parts and use a temperature...
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6 replies | 372 view(s)
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About clh333
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About clh333
Biography:
69 years old, been involved in personal computers since 1982. Kaypro, Commodore, Atari and PCs.
Location:
Cleveland, OH, USA
Interests:
Electronics, Golf, Boating
Occupation:
Information Technology
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