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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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  • If you refer to the datasheet, the first line reads: "Fast acces time: 150ns". This means that anywhere that when emulating you  have a 150ns time window to react to the inputs of the circuit where the chip is being emulated.

     

    Using "bare metal" programming I'd say that would be "worth a try". But keepnig convenient things like Linux running on the 'pi would be impossible.

     

    That said: you're going to emulate a 28-pin chip. With only two power pins you'll need 26 free GPIO pins. I don't think the 'pi has that many free GPIOs.

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  • If you refer to the datasheet, the first line reads: "Fast acces time: 150ns". This means that anywhere that when emulating you  have a 150ns time window to react to the inputs of the circuit where the chip is being emulated.

     

    Using "bare metal" programming I'd say that would be "worth a try". But keepnig convenient things like Linux running on the 'pi would be impossible.

     

    That said: you're going to emulate a 28-pin chip. With only two power pins you'll need 26 free GPIO pins. I don't think the 'pi has that many free GPIOs.

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