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
Search found 7 matches
- 08 Jun 2018, 22:47
- Forum: Workshop
- Topic: Alternative capsense patterns testing
- Replies: 10
- Views: 4460
- 24 Apr 2018, 23:21
- Forum: Gallery
- Topic: Make Cyrillic Great Again
- Replies: 86
- Views: 26704
- 04 Feb 2018, 14:30
- Forum: Workshop
- Topic: Using the Ragel state machine compiler for the firmware layer logic
- Replies: 3
- Views: 1848
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 firmwa...
- 28 Mar 2017, 18:57
- Forum: Workshop
- Topic: CommonSense: matrix LCR meter with a HID interface
- Replies: 572
- Views: 210591
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 the ...
- 28 Mar 2017, 06:49
- Forum: Workshop
- Topic: CommonSense: matrix LCR meter with a HID interface
- Replies: 572
- Views: 210591
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 ...
- 08 Dec 2015, 22:38
- Forum: Gallery
- Topic: ITC XKB-3 (Modified XT Keyboard)
- Replies: 3
- Views: 1518
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, it...
- 03 Dec 2014, 22:52
- Forum: Workshop
- Topic: Soarer desparately needed!
- Replies: 73
- Views: 23523
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....