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Can you use a pi as an eeprom emulator?

razorx

hi guys i have some spare time on my hands and ive started looking into some retro consoles like the master system and im thinking of maybe making my own homebrew game, i already have a programmer and some M27C256B and AT28C256 eprom/eeproms and i was wondering for testing if there is a way to setup my raspberry pi as an emulator using the gpio instead of having to keep erasing and reprogramming the chips.

 

ive already looked into an actual eeprom emulator but there far too expensive is there anyone who can help me with this thank you.

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  • in reply to razorx

    If I needed one I would build it myself  - either on a custom pcb or possibly on veroboard wired point to point with solderable wire (I don't use that technique much now.)

     

    I was going to suggest a little FPGA baord from lattice but it won't be 5V compatible.

     

    Are you able to make a board or wire on veroboard  -the chips won't cost much, Farnell have a 512k x 8 (4Mbit RAM) in DIP and 5V tolerant for £3.31 - you'll need a handful of other chips but it isn't a huge job.

     

    MK

  • in reply to michaelkellett

    i dont really have any experience with this im new, i am looking to make or setup the simplest and/or cheapest eprom/eeprom emulator for M27C256B and AT28C256 chips i just need to know where to start or what to buy

  • in reply to razorx

    Hi Michael,

     

    Since you mention simplest/cheapest, a quick solution is to use a software simulator or emulator. A lot of the old games consoles have emulators that run on a PC. It may be quicker to prototype directly in such an emulation/simulation and then write to EEPROM (or EPROM) when you've ironed out all bugs.

     

    As a digression, I once had up to 50 attempts to develop some software for a particular offering - because I only had 50 OTP devices (no EPROM windows : ).

    The software was complete and product delivered to a customer within just a dozen attempts. Partially this was due to testing on a PC as much as possible.

  • in reply to shabaz

    yeah i know i could do that but im looking for a simple hardware solution as a bit of a project to do but thank you for the suggestion