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Parallax TurboROM

txmarshtxmarsh Posts: 58
edited 2015-02-19 15:32 in General Discussion
Soooooo..... by any chance does anyone know if the old (circa 1992) Parallax TurboROM supports 2716 or 2732 eproms? I have a chance to buy one but the seller doesn't know much about it and I cannot find a spec sheet on the web. I work primarily with old 2716 eproms.
Thanks,
Tim

Comments

  • txmarshtxmarsh Posts: 58
    edited 2015-02-17 17:25
    Surely someone from Parallax knows the TurboROM design specs ... it's only been 20+ years! ; )
  • kwinnkwinn Posts: 8,697
    edited 2015-02-17 20:00
    I'd suggest contacting someone in tech support for that info.

    A lot of equipment I was involved with years ago used 2708/16/32 eproms, and I still have a bunch of them. Is the TurboROM an eprom programmer or perhaps a ram based eprom emulator?
  • Ken GraceyKen Gracey Posts: 7,392
    edited 2015-02-17 20:32
    I asked Chip to answer this post. He's the only person who will know for certain.

    Ken Gracey
  • cgraceycgracey Posts: 14,155
    edited 2015-02-18 09:01
    As I recall, the Turbo ROM could emulate up to a 27256 (32KB). It was a 28-pin system. I believe 2708/2716 EPROMs were 24-pin devices. I looked and can't find the source code for the Turbo ROM, so I can't say for sure whether it would work. I miss how simple and straightforward things used to be.
  • txmarshtxmarsh Posts: 58
    edited 2015-02-18 11:28
    Yes.. 2716s are 24 pin. I guess the TurboROM is too new for my use!
    Thanks!
  • kwinnkwinn Posts: 8,697
    edited 2015-02-18 11:37
    txmarsh wrote: »
    Yes.. 2716s are 24 pin. I guess the TurboROM is too new for my use!
    Thanks!

    If you only want to emulate 2716/32 eproms you can probably do that with a propeller and 2 or 3 buffers/level translators. May not even need the buffers for some applications.

    If you also want to upload and and program eproms that can also be done but it is a bit more complicated. I built one from an old magazine project using a Z80 many years ago so for sure the propeller can handle that.
  • txmarshtxmarsh Posts: 58
    edited 2015-02-18 11:50
    kwinn wrote: »
    If you only want to emulate 2716/32 eproms you can probably do that with a propeller and 2 or 3 buffers/level translators. May not even need the buffers for some applications.

    If you also want to upload and and program eproms that can also be done but it is a bit more complicated. I built one from an old magazine project using a Z80 many years ago so for sure the propeller can handle that.

    I just want to emulate. I'm trying to avoid taking on another project just to support a project .. But maybe I'll need to look into designing an emulator. Thanks!
  • jmgjmg Posts: 15,173
    edited 2015-02-19 14:40
    txmarsh wrote: »
    Yes.. 2716s are 24 pin. I guess the TurboROM is too new for my use!
    Thanks!

    Isn't that just a simple adapter header, to go into the subset socket ?
  • kwinnkwinn Posts: 8,697
    edited 2015-02-19 15:32
    jmg wrote: »
    Isn't that just a simple adapter header, to go into the subset socket ?

    It's usually a bit more than that. An emulator can be a simple battery backed sram and a bit of logic that allows it to be programmed by the eprom programmer or a unit that sits in the eprom socket and can be reprogrammed while it is in the circuit. A propeller would be great as an in circuit eprom emulator for such old eproms. It has enough I/O, memory, and speed for the task. The only thing it might need is a buffer/level translator for the data bus.
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