Suitable CHR EPROM for HVC-RROM?

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togemet2
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Suitable CHR EPROM for HVC-RROM?

Post by togemet2 »

What would be the most suitable EPROM for use on a HVC-RROM reproduction?
The CHR pinout is extremely odd, would I absolutely have to resort to having to rewire it, if so, are there any good examples on what exactly to do? Or should I just push it aside and grab a much simpler NROM board instead. Thanks!

Code: Select all

  RROM Non-standard 64-kbit CHR pinout
             ---_---
      A7  - |01   28| - +5V
      A6  - |02   27| - A8
      A5  - |03   26| - A9
      A4  - |04   25| - A12
      A3  - |05   24| - /CE
      +5V - |06   23| - NC
      +5V - |07   22| - /OE
      A2  - |08   21| - A10
      A1  - |09   20| - A11
      A0  - |10   19| - D7
      D0  - |11   18| - D6
      D1  - |12   17| - D5
      D2  - |13   16| - D4
      GND - |14   15| - D3
             -------
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Ben Boldt
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Re: Suitable CHR EPROM for HVC-RROM?

Post by Ben Boldt »

There is plenty of room inside the shell isn't there? If I were you, I would get a DIP socket and solder wires from it to the PCB. This has the advantage of being a removable EPROM, so you can reprogram it at a later date.
Pokun
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Re: Suitable CHR EPROM for HVC-RROM?

Post by Pokun »

To fit a DIP socket you would usually have to cut a whole in the cartridge shell, and even when doing that there's only just enough space for it. Unless maybe if you have a very low-profile socket or something.
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Ben Boldt
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Re: Suitable CHR EPROM for HVC-RROM?

Post by Ben Boldt »

If you put a DIP socket into the original PCB, it will not fit into the shell, that is correct. But, if you put the socket free-floating in the empty space in the shell, connected with wires, it does fit.
Pokun
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Re: Suitable CHR EPROM for HVC-RROM?

Post by Pokun »

Ah yeah of course.
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togemet2
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Re: Suitable CHR EPROM for HVC-RROM?

Post by togemet2 »

Ben Boldt wrote: Thu Mar 17, 2022 10:49 am There is plenty of room inside the shell isn't there? If I were you, I would get a DIP socket and solder wires from it to the PCB. This has the advantage of being a removable EPROM, so you can reprogram it at a later date.
Thanks for the advice, didn't think of that! I don't mind cutting a hole in the shell to take out and reflash the eproms as I'm just making it as a fun project.
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