[Coco] Re: [Color Computer] Re: MC-10 joystick interface
Torsten at Dittel.info
Fri Aug 5 05:59:17 EDT 2005
Thanks for figuring this out. I'll post a schematic and a layout after
completing my testing of Roy's CoCo2VGA converter which had been delayed
by the preparations of my weding party last saturday.
> The chips closest to the connector are 74LS138N's.
> That's a 1 of 8 decoder/demultiplexer.
> Those do the address decoding.
> The HEF40097BF is a "3-state hex non-inverting buffer".
> This provides the connection between the joystick and the data buss.
> The decoder sends out an enable for the buffer to output the lines
> passed through the joystick when it's address is accessed.
> The caps are for noise reduction and the resistors probably keep the
> inputs to the HEF chip low till the joystick is moved or a butten is
> pressed and then those lines on the HEF go high.
> It should be easy to reproduce.
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