Home designed hardware

[Rick C. Hodgin]

Anybody out here want to discuss home-built hardware?

--
Rick C. Hodgin

[Paul]

Rick C. Hodgin wrote:
> Anybody out here want to discuss home-built hardware?
>

I've actually made a keyboard by the way.

Probably more than 30 years ago now.

It was made before keyup/keydown encoding, and
the keyboard just sends a character when pressed,
via an 8 bit bus. The controller chip was commercial, so
that part was easy. It had a three-scan debounce time
for the scanning matrix.

The PCB was a colossal pain to do. Preparing the
PCB wasn't difficult. The board was thru-hole, and
the first task is transferring the matrix pattern onto
the PCB (you drill holes for all the switches first).
The hardest part was getting the key assembly to mate
with the PCB. That took *hours*.

The keyboard used diodes, for N-key rollover. One
diode per crosspoint.

Paul

[Rick C. Hodgin]

On 7/26/2018 11:03 AM, Paul wrote:
> [snip]

You know how to crush a person, Paul. You know how to discourage
them, to hurt their feelings and trample on them, their desire, drive,
and initiative. You know how to do harm.

You're a hurtful person, Paul. What a legacy to possess and occupy.

I am sad for you.

--
Rick C. Hodgin