CPS1 PAL chips (SF2CE)

[RetroReboots]

Hi,

Does anyone know the purpose of the PAL chip located at position 11D and why I sometimes see it included with the SF2 upgrade rom set? When I upgraded mine I only replaced #21,22,23.
Thanks

 

[Pythagoras]

An excerpt from Mame CPS1 Driver source. Take a look for more info about the subject)

"bprg1.11d", CRC(31793da7)"

"The BPRG1 PAL found on later B-boards allows the use of a larger program ROM space."