deskthority

I'm not shocked that the IBM's choices had this appearance - they had been using similar designs during the previous decade for their membrane and pcb based read-only-stores (ROM to us)

http://www.glennsmuseum.com/ibm/ibm.html#ibm_ros

Fun times, grats on more tests DMA!
dfj

XAXAXA

Definitely - I've hoping to eventually work out a, say, kll <-> augmented FA model, as I already have one for the scan and debounce.
I'm hoping someone could eventually create an interface between user-editable configs and a matrix description to generate almost all of the grunty parts of the ...

DMA:

Yeah - I used a very primitive filter to deal with my noise - and I roughly know the sources as well.

The spikes are interesting - they are located at the front and back of the strobes, so I smoothed the rough edges off of them with some 10 nF I had around, but I didn't do the math nor fix ...

Damn - your work is inspirational - made me mess around with my scoping and see if I couldn't replicate one of my claims - namely, that after a few tries, I can get off a double tap on F within a 16ms window.

It's been a long time - this was harder than I expected, and I'm getting some 60Hz noise I ...

At first I thought I agreed they were RLC filters to deal with a noisy environment, but notice the last strobe line is heavily filtered - it's the one that is on the left-hand side of the keyboard, and fairly exposed - but it is a strobe, so it's pretty much noise-immune.
The way the IBM F works ...

I've discussed the OSS of the firmware a number of times with Soarer, and it has been clear that it was not *yet* his intention to open it, though it was likely a future option.
Decompiling his firmware, modifying and redistributing it is not a polite, nor particularly legal thing in many countries ...