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If I had to guess, the sixty or so diodes required for an NKRO matrix might have blown the money budget for the project, about like trying to do that kind of wo
by throwanem 1y ago
If I had to guess, the sixty or so diodes required for an NKRO matrix might have blown the money budget for the project, about like trying to do that kind of work in an interrupt handler would blow the cycle budget for any interesting program even had it been possible. Typing more slowly is free.
Hard to say. I would need to look up component prices for a few years prior to my birth, and it would take me a few minutes to find that archive of 70s Radio Shack catalogs again - though I believe it was actually posted here, so. Of course anyone serious enough to be building an entire computer in those days, brilliant keyboard hack and all, probably wouldn't be sourcing a jellybean part like 1N400x signal diodes one by each...
- WalterBright 1y agoThe keys I used weren't jellybean. They were excellent keys. They were in the surplus bin because EBCDIC keyboards were already obsolete by then. I had very little money at the time, and scrounged for parts.
- throwanem 1y agoBy "jellybean" I meant the sort of small signal diodes one might use to prevent aliasing in a keyboard matrix. I know where I'd have gone to get those in my twenties, but not really how I'd have afforded that many for one project, even at the (very) small discount they might have given me on an order of that size. Unfortunately, now that I've finally reached a point of being able to really effectively use such a resource as that store, in its place now stands a Sonic drive-in. So it goes.