Electronics > Projects, Designs, and Technical Stuff

Cloning a Commodore PET-2001

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mikerj:
Fantastic project! I seem to be missing the time and motivation to do this kind of thing these days.

james_s:
It's totally cool, although I think if I were going to do it I'd just put the whole thing in a small FPGA, though there is something neat about "real" hardware.

The PET is simple enough that it could probably be put into the same hardware as this http://searle.hostei.com/grant/Multicomp/  I've built all the variations and it works great.

GK:
Yeah, that was discussed earlier in the thread. Here I'm just making use of the current production 6502/6521/6522 variants/equivalents currently produced by WDC and sold by Mouser. It's just fun to functionally clone a ~40 year old computer basically the old fashioned way using entirely current production discrete CMOS logic, uP and peripherals.
 
The (Z80) TRS80 model 1 is next on my list. I don't think that there are too many other "mini" computers from the era which can be cloned this way (not requiring NOS chips no longer manufactured).

Given the almost cult following and nostalgia for the 6502, I'm surprised that so far I appear to be the only one around here building a 8-bit machine with the modern WDC 65XX parts.

james_s:
That really is pretty cool. The surprising aspect is just how few parts are on that board even using individual components. It's also a bit surprising that in 2018 there is still a current production DIP packaged 6502.

LaserSteve:
If you clone the TRS-80, make sure you do an expansion interface. Its pretty much a paperweight without one.
I imagine a CSAVE/CLOADusing wav files is a lot better then using the cassette player.

I wonder if all those trash-80 magazines with their One Line Program competitions are still one line.
A 16K Level II TRS-80 would burn a lot of memory for every new program line. A tradition appeared for writing one line programs to save ram.

Answered my own question about one liners...

Edit, Yep.. Lots of them...

https://www.muppetlabs.com/~breadbox/software/trs80-oneliners.html

I gave my TRS-80 to a Russian immigrant kid in the late 90s, you would have thought I had given him a Mainframe or a Cray given the look on his face.

I still have the "TRS-80 modular furniture system" desk. Yes, the Shack once sold computer furniture.

Steve

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