19 Aug
2013
19 Aug
'13
1:07 a.m.
On Sun, Aug 18, 2013 at 9:24 PM, dwight elvey <dkelvey at hotmail.com> wrote:
The 8035 is a mask rom part but that doesn't mean
it can't be used.
Actually the 8035 is the ROMless variant of the 8048. It may actually have
a ROM of unspecified content, but the 8035 part number designates that it
was sold as a ROMless part. EA (pin 7 of a DIP-packaged part) is an active
high "External Access" input, which forces the part to ignore the internal
ROM. For an 8035, the spec requires this to always be asserted. If you're
curious, you can use that do dump the ROM contents of the supposedly
ROMless part.
Eric