10 Sep
2001
10 Sep
'01
6:17 p.m.
Pete Turnbull wrote:
On Sep 10, 23:26, Paul Williams wrote:
That's interesting, I hadn't realised it was selectable. I'll check the
polarity on the FMPS.
I'm looking at dumping the ROMs from a VT100
board, but I'm having
trouble finding pinouts of the ROMs.
Could anyone please tell me definitively whether the 8316, 9218
and 2716 are pin-compatible?
Nearly, providing you're referring to the 5-volt-only 2716. The
polarity of the chip selects is mask-programmable on the 8316. I
don't know which way DEC used for the VT100, but the way they
usually did it was CS1 and CS2 (pins 18 and 20) active-low with
CS3 active high So if you are reading DEC 8316's on a programmer,
set it for 2716,
and if it reads as if empty, bend out pin 21 and ground it.
Thanks, although that would be redundant, after your next statement...
I'd be interested to know which VT100 ROMs you
have
The standard VT100 ROMs are 031 (or 061), 032, 033, and 034, but
there are lots of variants.
061, 032, 033, 034, exactly as the FMPS says.
I have images (and original ROMs) of 061, 032, 033,
034 but I'd
like to get any others to add to the archive.
They're not online, Pete! I would like a copy of those, please, because
there is a guy on comp.sys.dec who is planning a VT100 front-end to Bob
Supnik's SIMH (thread called "Need VT100 Expert"). I would also like a
copy of the chargen ROM, 23018E2-00, if you've got it.
Would you like a copy of the VT320 ROM? I've got that handy.