Electronics > Projects, Designs, and Technical Stuff

Cloning a Tandy TRS-80 Model 1

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nick_d:
That's good to hear (about the lowercase support being much improved in later versions of the system). And, also, yes the disassembly has already been done, even if it isn't needed for this purpose. I was looking into it the other day and I discovered the book "Microsoft BASIC decoded and other mysteries" which I think you are referring to. Since Level II BASIC includes the double precision (though incomplete as cut down to fit in 12K) and other goodies, I think this disassembly may be a useful supplement to the NASCOM 8K BASIC disassembly for my purpose of analyzing the extended CP/M BASIC.
cheers, Nick

b1ackmai1er:
Hi GK,

I came across your TRS-80 Model I development post in my search for a graphics font. Impressive work indeed.

I was wondering if you would be able to share a copy of the graphics character "rom". I saw you posted a hex file of the standard character set but you advised that the graphics character set is "generated". Would you still be able to do a dump of this character set and share it? Alternatively, if thise is generated by Z80 code, would you mind sharing the code?

I have found heaps of trs-80 font resources on the net but they are all font conversions to ttf or similiar. It's seems nearly impossible to get these back to a bit map rom.

Thanks for your time.

I'm chasing these to add a graphics character set for 128 to 256 character modification:

https://www.retrobrewcomputers.org/doku.php?id=boards:ecb:vdu:start
https://www.retrobrewcomputers.org/doku.php?id=boards:ecb:vdu:fonts

Regards Phillip

rambobrite:
Regarding sound - the Model I was notorious for spewing RF interference.

If memory serves, Softside magazine had a program that would play "Don't it Make My Brown Eyes Blue" through for-next loops and the like. Just placing a radio near the computer would pick up the noise. (I won a free game from my Radio Shack on a bet, the manager being certain the Model I couldn't make sound.)

Some early games leveraged this "capability", until sound generation through the audio jack became a thing. I'll see if I can track any down.

DDunfield:
Hey.. just noticed this thread. Good job on the TRS-80 M1 clone!

I've got a couple homebuilt TRS-80 Model IIIs on S-100 cards in my collection, I didn't build them, they were donated by the guy who built them.

http://www.classiccmp.org/dunfield/t80s/index.htm

Dave

Rick-S:
GK, This  is an amazing project.  I'm in awe of your reverse engineering skills.  I can't wait until you get it complete to see the final outcome. 

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