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Author Topic: A Couple of Hobbyist Computers  (Read 252 times)

Sterophonick

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A Couple of Hobbyist Computers
« on: 31 August 2019, 22:30 »

I would like the Gigatron TTL Microcomputer, and the PE6502 hobby computer to be emulated in MAME. They are both interesting computers, and might be potential MAME preservation targets.
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Stiletto

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Re: A Couple of Hobbyist Computers
« Reply #1 on: 22 November 2019, 12:55 »

We could possibly emulate both of these in MAME (aside from the PE6502's Propeller interface).

To emulate the Gigatron at the TTL level, we will need a lot more devices added to MAME's netlist library: 74138 (74HCT138), 74139 (74HCT139), 74157 (74HCT157), 74240 (74HCT240), 74244 (74HCT244), 74273 (74HCT273), 74283 (74HCT283), 74377 (74HCT377), 74595 (74HC595), 27C1024, 62256, CD4021... Even if they could all be supported, the simulation could surely not run at the megahertz-plus needed.
So we might need to emulate it at a higher level for now instead.
But it doesn't need to be dumped! It's open-source and ROMs are available. So it does not (yet) have a home at Undumped Wiki. Maybe in the Discrete page, but that's only for arcade games at the moment.

As for the PE6502...
The PE6502 ROM has not been dumped (though it largely uses Apple software). He does not offer it for free, so it would require the purchase of a PE6502.

Even after that - there's the unofficial "3 year rule", and it seems like we might be barely past that in the PE6502's case.
« Last Edit: 22 November 2019, 13:13 by Stiletto »
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Stiletto

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Re: A Couple of Hobbyist Computers
« Reply #2 on: 22 November 2019, 19:31 »

Added the Putnam Electronics PE6502 to the Undumped Computers and Consoles list:
https://mamedev.emulab.it/undumped/index.php?title=Undumped_Computers_and_Consoles#Putnam_Electronics

As for the Gigatron, I added it... then I removed it, as it is (and has always been) dumped.
https://mamedev.emulab.it/undumped/index.php?title=Undumped_Computers_and_Consoles&diff=135984&oldid=135983
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