[Coco] $4 USB HOST a chip

Allen Huffman alsplace at pobox.com
Fri Feb 24 09:09:11 EST 2017

> On Feb 24, 2017, at 6:53 AM, farna at amc-mag.com wrote:
> "Now I see, said the blind man..."
> Wasn't clear where you were plugging this thing in at first. I was
> thinking (like most, apparently) that you were talking about a general USB
> port addition... either plugged into the serial or cartridge port. With a
> $4 chip making an adapter for each device is practical, though a finished
> product would probably be $25 or so... still reasonable. Wouldn't some
> programming or hardware be needed for the CoCo keyboard matrix though? I
> can see joysticks being much simpler.

Well, the keyboard matrix is just a list of switches, so it's just a lookup table. "If A is pressed down, connect X and Y".

I have more "key down, key up" switches in a haunted house I worked on that the CoCo keyboard matrix, and that was all driven by a $9 Arduino clone. :)

		-- A

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