13 Apr
2001
13 Apr
'01
2:53 p.m.
Glenn Roberts <groberts(a)mitre.org> wrote:
I've been working with someone who has an old
8080-based single board
computer he's trying to get to work. We're investigating several
possible problems but it's starting to look like there's a problem with
the EPROM. I have the ROM code he needs and will be checking out the
EPROMS, but we may be faced with a need to reprogram one or both of
these. They're the old 256 byte 1702A Intel chips (ceramic). I've only
programmed the 27xx series but have read that the 1702's are "really
difficult" to program. Was wondering if folks in this group could
comment on how to proceed if/when we decide we need to reprogram one of
these. Are there more modern plug compatible alternatives? We may also
need to replace one or both - any sources known other than eBay?
thanks.
Hi Glenn
I can program 1702A's and with some notice, on time, I
can reconfigure to do 1702's but these are so rare I
haven't dealt with them. For small quantities, if you
send PROMs with return postage, I'll program them for
free ( not more than 10 PROMs ). I can also get schematics
for a programmer that can be put together with a number
of parts ( mostly discrete transistors ) that can be run
from most any uP with a number of I/O ports ( from an
original Intel App note ).
The files should be on DOS format files and can be
S, HEX or BPNF formats. Other formats will take me
some effort to make a converter.
Don't send known blown parts. I don't want to be your
test for parts. I can't be responsible
for parts that may fail while programming but they
will be programmed on an Intel build programming card,
that is know to work.
Let me know.
Dwight