I wouldn't be using EEPROMS. I would be using EPROMS. There IS a difference in the method of erasure and programming.

I keep everything from 2716's to 27C040's and everything in between for my machines on-hand.

You could run into problems programming larger than needed EPROMs due to utilizing the wrong address space (just one potential hurdle to overcome).

Greg

Depends on the board. There was a wide range used.

2716, 2532 and 2732 (use 2732 whenever it is easy to do so) for early SS
2764,27128,27256 for later SS games
1-8Mbit or more for DMD era. 27c040, 4Mbit feels most common in WPC games.

Good reference here. Use the file size of the computer image file to determine what size EPROM to use.
https://en.wikipedia.org/wiki/EPROM#EPROM_sizes_and_types

EPROM = Electronically Programmable ROM

EEPROM = Electronically Erasable Programmable ROM

Main difference is EPROM uses UV light to erase while EEPROM uses you write to them to erase. Other than that once erased I'm fairly certain they are compatible. But yeah, you want EPROM.

You will also find one time programmables, aka OTP in WPC ROM sizes. You can only burn these one time. EPROM have a window on the chip. When you expose this window to a special light spectrum, it erases the IC. EEPROM, the burner will erase for you (if supported, i havent messed with these but a few times).

ebay is a pretty fairly safe source to buy EPROMs cheaply.

27c040 will probably be the most used size in WPC from my XP, but i think some games might use smaller and i know whitewater uses a larger 8Mbit eprom for the home rom. IF you want to check this, download ROMs from IPDB or wherever and see what file sizes are used for each game. Then you can decide what you need.

For WPCs and later

27c010/27c1001
27c020/27c2001
27c040/27c4001
27c080/27c801

If you plan on doing Data East / Sega / Stern, get 27128, 27256, 27512 - or 27c128, 27c256, 27c512

Raise The Dead!... Thread!

Appropriate because I'm working on an Addams Family...

I wanted to use the anti-ghosting ROM patcher for WPC games on my Addams Family.

I already screwed-up once: I didn't want to peel the sticker on the current PROM, so I believed a post that said to use a M27C2001. Well that didn't work so good. Turns out I need a 27C4001.

My question is: Does the EPROM's speed matter?
The current PROM has a 10 in the full model number, so I assume it's 10ns. The EPROMs on E-Bay range from 10ns to 150ns.

What speeds work with WPC and WPC-95 games?

Thanks!

- Mark