Jeff is right, but Kickstart ROMs are mainly on MX23c2100 (256KB roms) and MX23c4100 (512KB roms).
I also have a 3.1 ROM on a AM27c400, but it gives me problems, doesn't work properly on my A500 rev.6a and not at all on my A2000-A.
I have asked the pinout to AMD, 'cause they don't have it on their site, and they have sent me a fax.
Actually 27c400 is perfectly compatible with MX23c4100, but there may be some capacity differences.
Hi
S.
