I'm pretty familiar with the VT-11 (GT-40) instruction set, and would be
able to write a port
of that code to run on a HP1350 vector box.
Ah, somebody else has one of those interesting units... I asusme you've
looked inside. It's all random logic (lots of it) to decode a small
subset of HPGL (in ASCII!) into binary numbers of the endpoints of the
vectors, and then display them.
I have a couple of them, and the official HP service manual...
On the main board there are 2 10bit DACs. There are 6 presets in each DAC
to adjuse the 6 most significant bits (the lower 4 don't matter too
much). These 2 rows of presets, due to their appearance and function,
were quickly named the 'graphic equaliser' here :-)
You do realise that the GT40 is a complete computer (there's a PDP11
processor in there), while the HP1350 is just a display. Still you can
hang the 1350 off just about any machine with an HPIB port I guess.
-tony