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Upgrade ROMs to 2 Roms v1.3

J

joeatact

Member
Joined
Nov 29, 2023
Messages
24
Is there instructions how to replace the 3 cable set roms with the 2 rom v1.3 set?

Joe
 
I have a ZIP file on replacing the three ROM's with Texas Instrument EPROMS (TMS-2532 & TMS-2564).
It's easy enough just to use the EPROMS. (I may have had to use one PULLUP resistor, I'd have to look
at my Model 1. (Won't be able to do that until Early April.) No need to just use two EPROMS and do a
lot of rewiring.

Do you have the Lowercase modification in your Model 1? What is the number of your Character Generator IC?

Larry
 
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ldkraemer said:
I have a ZIP file on replacing the three ROM's with Texas Instrument EPROMS (TMS-2532 & TMS-2564).
It's easy enough just to use the EPROMS. (I may have had to use one PULLUP resistor, I'd have to look
at my Model 1. (Won't be able to do that until Early April.) No need to just use two EPROMS and do a
lot of rewiring.

Do you have the Lowercase modification in your Model 1? What is the number of your Character Generator IC?

Larry
Click to expand...
Larry, do you mind posting or DM the ZIP file with the instructions for replacing the 3 ROMS with TMS-2532 & TMS-2564? Thanks Jim
 
Jim,
Here are the files for the Radio Shack TRS-80 Model 1 Version 1.3. If you need different formats
for your programmer I can also convert the .HEX to what your programmer requires.
You will have to program the Large EPROM with two files, depending on what order you use.

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Larry
 
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