![]() ![]() Alternate a high/high impedance low signal across the 0-4 'pins' on the left, and read the resultant signal level on the right (pulling low to drain it.) - i.e. while there's tonnes of docs on this stuff, it's pretty obvious what's going on here. (the colouring was actually done in about 5 minutes using paint shop pro - the wand tool really is good!). ![]() The speccy membrane from RWAP, scanned in (click for big) Since we're after a proper USB keyboard, remapping on the host seems really lazy (I can't exactly remap random colleagues' keyboards in work), so we decided to do it. You might have seen the excellent "Entire PC Speccy" - here, this chap used bits from a modern USB keyboard, and (since he had the entire PC in the case) remapped the keyboard. Fortunately there's a brilliantly retro guy selling new replacement membranes, so another (well deserved) £15, and we're back in business. as soon as I pulled it apart, it became obvious that the keyboard membrane was a wreck (25 year old Polyethylene seems to dessicate badly) - simply pulling out of the connectors caused it to fall apart. I got one of said devices on ebay (on a whim) about 2 years back, and it's been sitting gathering dust. They're full of nostalgia, and make me quite weak at the knees. You can pick these up on ebay for about a tenner (15 quid if you're unlucky). However, this has been on my todo list for about 2 years now, and since I noticed something similar on hackaday, I thought I'd better get it finished before someone else does! ![]() About every year or so, I get a sudden urge to do some undergrad hardware.įortunately, LanceR is actually pretty good at the hardware side (heck, he got me to solder in a straight line - that's nigh on a miracle), so we occasionally end up hatching some hard/soft hybrid plan, which is great, and goes nowhere, because we're both extremely important and busy people. ![]()
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