Electronics > Projects, Designs, and Technical Stuff
Cloning a Tandy TRS-80 Model 1
kizmit99:
--- Quote from: oPossum on January 08, 2019, 02:14:47 am ---'Enter' for default. It will then ask "CASS?", 'Enter' for default again. Then you will get "READY>".
--- End quote ---
Huh??? I've never seen one do that?
I suspect you may be thinking about a Model-III or possibly Model-4 boot sequence?
oPossum:
Yep, got it confused with Model III/4. Thanks for the correction.
Had to run my emulator to refresh my memory.
kizmit99:
Oooo... I notice your Model-1 emulator is running the "upgraded" ROMs (I think they may be called "version 3"?). The ones where "RadioShack" was abbreviated "R/S" to reduce space and allow the upgraded basic to fit in the 12K.
I've been looking up and down for that ROM image and can't seem to find it anywhere on the 'net. (I obviously must not be looking in the right places).
Any chance you could either share that rom image, or point me in the direction of where I can find it?
Thanks in advance!
rrinker:
I believe Dave is correct, and the lower case mod became standard equipment on later Model 1's. Subsequent systems, Model 3 and Model 4, had it all designed in to the system, no bodge board needed.
Note that the Model 100 uses an 80C85 CPU and it a completely different animal from what is being discussed in regards to cloning a model 1.
Now a clone of my old Model 4P - which was NOT just a Model 4 repackaged, there were a few differences in the design.....
oPossum:
--- Quote from: kizmit99 on January 08, 2019, 02:16:27 pm ---I've been looking up and down for that ROM image and can't seem to find it anywhere on the 'net. (I obviously must not be looking in the right places).
--- End quote ---
Already posted in the PET thread https://www.eevblog.com/forum/projects/otp-eprom-programmer/msg1605259/#msg1605259
This stuff was easy to find 20 years ago when I wrote that emulator!
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