9 Dec
2011
9 Dec
'11
1:44 p.m.
In article <201112092124.pB9LNw61073022 at billy.ezwind.net>,
"Jecel Assumpcao Jr." <jecel at merlintec.com> writes:
The circuit from the Vectrex videogame console might
be an interesting
option. It was based on the 6809 and so should be trivial to adapt for a
6800 machine. It uses analog circuits to draw lines: you set up the
initial x and y values, select the final x and y and let the circuit
interpolate between the two while the processor has time to do other
things.
The Tektronix 401x terminals also have a similar set of analog
circuitry driven by TTL combinatorial logic that handles decoding the
escape codes. Schematics are on bitsavers.
--
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