14 May
2007
14 May
'07
9:55 a.m.
On Mon, 14 May 2007, Bill Sudbrink wrote:
I went ahead and reverse engineered the TTL on the
NETRONICS ELECTRIC MOUTH, so I have a good idea of
the addresses, etc. that it uses. The main component
on the board is the above mentioned VS100, a 40-pin
chip that seems to be (along with 4 ROMs) the heart
of the board. Anybody have any info on this guy?
An old message:
http://groups.google.com/group/comp.sys.tandy/tree/browse_frm/month/1987-04…
... says that this board is based on a Digitalker MM54104 chip, with a
batch of attendant MM52164 ROMS. There's a lot of info to be found about
the Digitalker, including an article in the May 1891 issue of
Microcomputer which details a circuit for the TRS-80.
http://web.inter.nl.net/hcc/davies/ictadvsp.html
Mike Loewen mloewen at cpumagic.scol.pa.us
Old Technology http://sturgeon.css.psu.edu/~mloewen/Oldtech/