26 Jun
2008
26 Jun
'08
6:42 p.m.
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