26 Jun
2008
26 Jun
'08
8:34 p.m.
The vt100 PS was for that unit only ( and 105 and 125). I don't recall the #
now. The 101, 102, 131,132 and others all used the same PS and the boards
were interchangable. The 100 had a "backplane" type connecter, the other ps
had about a 10 pin connecter.
The 100 could be upgraded to a 105 or 125.
I think the vt103, which had a q-bus backplane had a ps of its own, along
with the PDT110.
On Thu, Jun 26, 2008 at 8:42 PM, Ethan Dicks <ethan.dicks at usap.gov> wrote:
On Thu, Jun 26, 2008 at 08:32:26AM -0700, Mr Ian
Primus wrote:
I was wondering, what are the differences between
the VT100 and the
VT102? I've never seen a VT102, but I have heard that there
were some
differences having to do with screen editing. Anyone know?
Similarly, does the VT102 hardware differ from the VT100, or is it just a
software
change?
My recollection is that the VT102 always has features that are described
as options for the straight-VT100. One I recall is that if you put a
VT100 into 132-column mode, it doesn't have enough video memory for all
24 lines, so you get a short screen. One of the hardware options (AVO?)
adds enough memory to give a full screen in wide mode.
I think that must be there because of the cost of SRAMs when the VT100 was
introduced (weighting the costs in favor of the majority 80-column usage
of the day). I don't recall seeing any clones with that limitation, just
the original VT100.
There are probably a couple other minor differences. Somewhere, someone
should have some DEC literature on the subject.
-ethan
--
Ethan Dicks, A-333-S Current South Pole Weather at 27-Jun-2008 at 01:30
Z
South Pole Station
PSC 468 Box 400 Temp -91.3 F (-68.5 C) Windchill -131.0 F (-90.6
C)
APO AP 96598 Wind 9.7 kts Grid 61 Barometer 672.1 mb (10928
ft)
Ethan.Dicks at usap.gov
http://penguincentral.com/penguincentral.html