to be a
at least
replacement ROM
after an
Chip
CS line
(1985) is
internal
most of
work just fine.
Donald, you are correct about the 8051, it is running at 12Mhz .
and in case i have not mentioned before the D23256AC lines/pins are consistent with the 27c256 in terms of conections made to the
8051now i am just awaiting new mouser ROMs to test the new style ROM reads that look like real code.
no readable ascii strings such as copyright strings or company name in the new style ROM reads though ?? so that has me still a little suspicious but as code the new ROM download actually runs and loop in an 8051 simulator so that is promising.
Thanks for all the help donald, robb