On Thu, Oct 4, 2018 at 05:00 AM, lop pol wrote:
IIRC the 468 ROM's came in three revisions, -00, -01 & -02, where
-00 and -01 were Mostek. The -02 had the same digital content as
the -01 but were CY7C264 EPROM's. The Mostek's are unreliable and
for that reason ought to be replaced although replacements could
be hard to find. With an adapter board common 27C64's could be used.