How to dump 1mbit mask roms from a konami 80's pcb

[MickyMac]

Would anyone have any experience in dumping 1m mask roms from a konami pcb?
Can you advise on what chip type to select or if I need a special socket?

I've tried a few methods and each time the dump doesnt match mame.

It's the 4x mask roms on a konami jackal pcb. The game is booting but the graphics are corrupt and I'm trying to rule out bad roms.

 

[ic3b4ll]

There are two types of 1 megabit ROMs with slightly different pinouts. Those are mask ROMs so I'd expect them to use... Mask ROM pinout.
Search for 27c301 pinout, it's the same as the one used on mask ROMs.
If your programmer doesn't support this type you can make a simple adapter to the more common 27c010 format.
Do note that 1 megabit ROMs have a very confusing naming, with every manufacturer basically choosing whatever they felt like that day, so you have EPROMs marked 27c1000 that can refer to either of the two pinouts depending on manufacturer.

 

[skate323k137]

How are you comparing to MAME? Are you using Romident?

 

[CoolFox]

You are talking about the 28 pin 23c1000 pinouts. Only the more expensive eprom programmers support the actual 28 pin 1mb pinout. Basically you would need to make an adapter for that, something like this:

https://www.tindie.com/products/caiusarcade/1mbit-mask-romeprom-to-27c010-adapter/