10 Sep
2001
10 Sep
'01
2:39 p.m.
From the classiccomp archives :)
http://www.classiccmp.org/mail-archive/classiccmp/2000-02/0645.html
AMD used 91xx for RAM, 92xx for mask ROM (with a couple of exceptions),
and >97xx for EPROM. AM9217 is an NMOS 2048 x 8-bit ROM; A is the
speed >(550ns), P means 24-pin plastic, C means commercial temperature
range (0-70 >Celcius). Pinout is the same as an 8316, 2716 compatible, but
the chip >selects on pins 18,20,21 can be specified either active-high or
active-low. > The AM9217 was superceded in the late 70's by the AM9218.
does that help?
At 11:26 PM 9/10/01 +0100, you wrote:
I'm looking at dumping the ROMs from a VT100 board,
but I'm having
trouble finding pinouts of the ROMs.
The VT100 FMPS says that locations E40, E45, E52 and E56 on the basic
board are 8316E 2Kx8 ROMs. However, the schematics don't show the
designations for all 24 pins. The online Chip Directory doesn't contain
the pinout for the 8316 either.
My PROM Programmer will handle 2716 EPROMs, which the Chip Dir. does
contain a pinout for, and looks compatible with the 8316. I'd be tempted
to try dumping one of them, were it not for the fact that E45 on my
board is actually labelled "AM9218CPC", the pinout for which is also
absent from the Chip Dir.
Could anyone please tell me definitively whether the 8316, 9218 and 2716
are pin-compatible?
Cheers,
Paul