This fits with a really neat trick I just read - have not yet tried out. See www.scitoys.com topic "computer controlled transmitter".
They use the DTR signal of an RS232 port to output low speed signals, in their case send morse code by feeding the DTR voltage into an oscillator chip (1MHz). But you could use DTR to control the gate array you envision. No need to get fancy; just a bit of C or Basic peek/poke to the registers maybe, or whatever you are comfortable with. The program for the morse sending is online but it's an exe only, so I cannot see what was done in terms of programming. Still, the basic idea of using the DTR port for output signal is what is important.
Guess you could use DSR as input, correspondingly.
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They use the DTR signal of an RS232 port to output low speed signals, in their case send morse code by feeding the DTR voltage into an oscillator chip (1MHz). But you could use DTR to control the gate array you envision. No need to get fancy; just a bit of C or Basic peek/poke to the registers maybe, or whatever you are comfortable with. The program for the morse sending is online but it's an exe only, so I cannot see what was done in terms of programming. Still, the basic idea of using the DTR port for output signal is what is important.
Guess you could use DSR as input, correspondingly.
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See http://www.bolis.com/amillar/electronics/serial-port-control-power-switch which at the end has perl code, referencing perl module, which source code could be read to gather tricks of trade.
Good luck!
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