What is the EPROM equivalent of a 40-pin '4M-16Bit' mask ROM?
I ask as I'm currently working on a Konami 'Bells & Whistles' PCB with an empty mask ROM socket at 3K. All other chips (custom and otherwise) are fine. Have tried the same mask ROM from a fully working Bells & Whistles and that works perfectly in this board, so I just need to program up a suitable EPROM with the binary.
There is provision on the board for a 40-pin or 42-pin chip (the mask ROM is 40-pin).
I've tried a 40-pin 27C4000 EPROM but no luck (although I believe that this SHOULD work!). Have also tried assorted 42-pin EPROMs .......... still no luck.
The size of the binary is 512K
Any ideas please?
Ta.
I ask as I'm currently working on a Konami 'Bells & Whistles' PCB with an empty mask ROM socket at 3K. All other chips (custom and otherwise) are fine. Have tried the same mask ROM from a fully working Bells & Whistles and that works perfectly in this board, so I just need to program up a suitable EPROM with the binary.
There is provision on the board for a 40-pin or 42-pin chip (the mask ROM is 40-pin).
I've tried a 40-pin 27C4000 EPROM but no luck (although I believe that this SHOULD work!). Have also tried assorted 42-pin EPROMs .......... still no luck.
The size of the binary is 512K
Any ideas please?
Ta.