Well that doesn’t look anything like a square wave. Bad multiplexer. Saved a Vintage computer from the scrap heap with good tools and a 79 cent chip that is still being manufactured
10 minute lunchtime progress: Working on more advanced ciphers I need a modulo 32 rotater (wraps 32 bit numbers around by bit at a time). Took a few minutes to wrap my mind around it, but I got it. Step 1 of a bazillion for ChaCha(and AES) complete but I’m happy at the moment #commodore #c64 #crypto
Implementing ChaCha… I need 4 eight bit ROLs, but the 6502 is really a 9 bit ROL. I don’t know why it didn’t occur to me to just to a CMP #$80 until now to set the carry before the rotate. Problem solved.
My first ever VIC-20 arrived. It seem salvageable, black screen, and you can’t beat $25US… I don’t own a dead test for a 20 so working on it old school. It was after I desoldered the horrible socket on UE11 that I realized I’m apparently out of 24 pin sockets. #commodore
Late lunch 10 minute progress: Next up is Pontifex from Cryptonomicon. Occurred to me while planning that I better do some card routines first so I don’t bite off too much at once. So create a deck and shuffle (requires two different jokers to work) is done. #commodore #c64
Today on my operating table is my very reliable Evinrude 50. Just changing the plugs, it’s not even sick or anything.
Michael Doornbos 