When deciding if you can use a larger size eprom in place, check out the pin outs. If the pinouts basically match, yet the larger eprom just has more address lines, you can double, quadruple, etc the image and use it.

2732 can replace 2716 with a doubled up image because the pinout match except 2732 has an extra address line connected to P21

Bit and Byte confuses people. EPROM sizes are expressed in megabit, but windows expresses file sizes in megabyte or KB. There is a chart on this page that should help you pick what EPROM you should use based on the image file size.

https://en.wikipedia.org/wiki/EPROM

Fun tip.... you can even use a FM1608 as a really expensive 2764 EEPROM.

When doubling or quadrupling up images in windows. I recommend using batch files (.bat).

Open up notepad application and put a line like this into it. Then save that notepad as a .bat file (not .txt) in the same folder with your image.

copy /b GAME.ROM + GAME.ROM + GAME.ROM + GAME.ROM QUADGAME.ROM

When you execute the batch file That string would quadruple the file GAME.ROM and output a quadrupled image file as QUADGAME.ROM. You must use the /b flag (binary)

Some EPROMs do not follow the standard pinout. Check out 27C301

27c301 (resized).png

I don't think this will come up in pinball systems, but i had to deal with it when putting custom software inside some atari 7800 cartridges.

I am not sure if I understand properly. The 27C301 is an EPROM that is close to the pinout used in masked PROMs, but not exactly. I had to modify the atari pcb board to take a standard pinout erpom like 27c010. Once the atari cart pcb was modded to the standard pinout, then i could sub larger eproms in that are doubled up.

bit or bye i think is the confusion.

if you binary file is one megabyte in size on the computer you need an eight megaBIT to burn it.

The way i think about it to pick eprom to use is I look at the file size and multiply by eight. If the file size on the computer is 4 kByte then I need a 2732 or 32 kBIT EPROM.

this chart on wikipedia helps.
https://en.wikipedia.org/wiki/EPROM#EPROM_generations,_sizes_and_types

hopefully when the board layout was done all the extra JEDEC standard pins are logically tied to something when larger memory is available in the same pin count package used. In pinball world I think this is always done, but probably worth checking the board or schematic.

sneak a pull resistor in or just be handcuffed to the original memory size... but I'd like to think that is a rare case.