18 Jan
2012
18 Jan
'12
10:57 a.m.
There are a lot of adapters (Atmel and PIC) that will take a PS/2
keybaord and make it into a USB device.... those would be a very good
start as you'd have 1/2 of the work down, next you'd want to guy the
VUSB core out of the code, then take the input from the PS/2 and set of
the ports of the microcontroller for output, setup a row and column and
create your matrix and then build the hardware with some diodes for the
outputs to avoid debounce and and other issues.
Jim Brain wrote:
On 1/17/2012 6:24 PM, Chuck Guzis wrote:
On 17 Jan 2012 at 16:49, Jim Brain wrote:
I agree. C=Key does exactly that, using a crosspoint for the matrix
and an AVR for the PS/2 protocol.
Jim
As Tony notes, KB matrix diodes would make things
more complicated, if
not impossible.
I concocted my soluation after looking at the TRS-80 model 4
schematics.
Clearly, other keyboard schemes will require other solutions. But
I'd still want a MCU to decode the PS/2 keyboard proposed. Maybe
Tony wants to do the decoding with discrete logic, but that would not
be my first choice for simplicity, expense or power. It's not the
PS/2's choice either to the best of my knowledge.
--Chuck