🚀 go-pugleaf

In article <LOKI.89Sep29125354@marvin.moncam.co.uk> loki@moncam.co.uk (Never Kid A Kidder) writes:
>Next question: I've seen inside my 520 ST, and I've seen the 17 wire
>connection from the keyboard to the rest of the computer.
But only 5 connect the keyboard subsystem to the main processor
>  Now I would
>like to make the keyboard separate, but I don't know if adding a whole
>length of cable (say two metres) will affect the operation.  Has
>anyone else tried this, or can anyone say if the connection needs to be
>as short as it already is?

My cable is 1.5 meters long. Works fine:

Find out the 5 wires for the serial interface: Send Data, Receive Data,
+5 Volts, Ground and -RESET.

Connect two 9-pin D-Sub connectors to the 17-wire connector. Now You
connect Mouse an joystick to the keyboard.


If You need a real long cable, use line drivers for the serial lines (74
07 and pullups or the like). I use 7407 and a pullup to +12 Volts as
sender and some 40XX CMOS chip as level converter at the receiving end
of the line (makes 2 TTLs and 2 CMOSses); I use the +12 Volt for power,
too. My keyboard has a 7805, so it gets real +5 V, not just 4.something.

hase
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