22 Oct
2015
22 Oct
'15
7:48 a.m.
The way I remember it is that the VT100 comes in
several configurations (for example AVO or
not) and you can field modify it from one to another.
On the other hand, the VT101 and VT102 are fixed configs (that is, not intended to be
field
upgradable), roughly matching the base and AVO versions of the VT100 in functionality.
That is basically how I remember it too. The VT100 was terminal that could be
field-upgraded, the
AVO [1] added, printer port added, graph board (VT105) added, and so on.
The VT101 is (officially) a fixed-configuration terminal, similar in features to a
'base' VT100
The VT102 is a fixed-configuration terminal similar in featurers to a VT100 with AVO and
printer port (?)
Internally the chassis metalwork and PSU are very different between the VT100 and the
VT101/VT102
The logic boards are different too, but from what I remember the circuit ideas are much
the same, the
same 2 custom chips are used in the video circuit of all these terminals. Am I remembering
correctly,
the VT100 uses an 8080 processor, the VT101 (and VT102 I guess) has an 8085?
[1] That acronym is a bit strange for me. Over here, AVO (standing for Amps, Volts, Ohms)
is
a famous brand of multimeter (analogue and digital) and also other test gear like signal
generators and valve testers. It is one of those trademarks like 'Hoover; that has
almost
become generic, people over here will ask for an 'Avo' meaning a multimeter.
-tony