8 Feb
2023
8 Feb
'23
5:30 a.m.
Paul Koning wrote:
Given 16 bit wide ROMs, I would expect the microcode
width to be
rounded up to a multiple of that, so 64 bits, which means the expected
ROM size is 64k bits. That matches two of the ROMs you mentioned.
I don't know if they are 16 bits wide. The two 68000 ROMs are 8 bit
wide. The others I have no data on.
Also, there aren't enough bits on the BBA board ROMs to make up 56x1024.
(I was wrong in my previous post, the microcode is 56 bits wide, not
57.) Besides, the contents doesn't look like code but graphics masks.