Can you use a pi as an eeprom emulator?

Used to make them back in the day with C64s, used the parallel port to FIFO the one side of the dual-port ping pong.  You may be able to find DIP ribbon cable terminations, we would use them with ZIF sockets so the DUT would be neat when it left the bench.

would it be easier for me to just replace the eprom/eeprom with flash memory or something similar to make it easier is that something that can be done i just want something that will allow me to easier change the data on it, ideally i would replace the chip with mmc so i can simply connect it to the pc through usb and flash the mmc with the rom is that something that would be easy to do or more complicated than trying to emulate the eeprom?

Michael,

You want cheap, easy, fast and convenient. You can't have them all.

I still don't understand where you want to use your eeproms. So anything that is not actually an eeprom may fail to emulate the eeprom close enough. So unless you tell us where you want to use the chips, we'll have to make suggestions that emulate the eeprom really really closely.

With an SRAM, you can emulate an 27c256 pretty close.

A quick google turned up: Ruud's Commodore Site: EPROM emulator

and EPROM Simulator | HW-server.com

(they look a bit similar)

Still it is quite a lot of hardware. Most of it is involved with getting the data into the SRAM chip.

If I were to design one of these myself today I'd use an STM32F072RB chip.It has USB and lots of IO pins (That gets rid of most of those buffer chips you see in the design above). Then I'd allow the PC via USB to write to the SRAM. Battery keeps the SRAM alive when unplugged, and when you plug it into the target, the SRAM will more or less directly emulate the eprom.

But the "eprom-emulator" is not my problem today. So I'm not designing it for you. If you're not designing it yourself, you'll have to find something that someone else has designed.

im sorry for the confusion basically i wanted to emulate the eeprom so i didnt have to constantly erase and reflash the chip but it seems like its not an easy thing to do so if there is an easier solution i would like to go for that instead that is why i was thinking perhaps it would be easier to replace the eeprom with something else like flash, essentially i just want to be able to easily replace the rom for testing purposes without having to keep removing the eeprom and connect it to my programmer and erase then reflash it if you have a suggestion i would love to here it thanks

Of course flash is easier.

AGAIN: where where you intending to use the eprom chip?

at the minute ive modifed an old master system game and added a zif socket and ive bought some eeproms and basically for fun i want to maybe create some homebrew games since i have some time on my hands so that is where the eeprom is gonna be but i want to take it up a notch and replace the eeprom with something easier to work with rather than having to keep using my programmer but im not sure where to start thats why im interested in perhaps getting rid of the eeprom and going for some sort of flash method or something along those lines but this is new to me.

at the minute ive modifed an old master system game and added a zif socket and ive bought some eeproms and basically for fun i want to maybe create some homebrew games since i have some time on my hands so that is where the eeprom is gonna be but i want to take it up a notch and replace the eeprom with something easier to work with rather than having to keep using my programmer but im not sure where to start thats why im interested in perhaps getting rid of the eeprom and going for some sort of flash method or something along those lines but this is new to me.

Why not use a game emulator in software to develop with? Then use the eeprom for final load.

i have been doing a bit of that too but i want a little project to do from the hardware front too so in the end i can make a pcb