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Michael Doornbos

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Category Archives: on the move

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

Posted bymrdoornbosMay 5, 2021Posted inon the move

Because what I really need is another project… #commodore

Posted bymrdoornbosMay 5, 2021Posted inon the move

Something is different…

Posted bymrdoornbosMay 5, 2021Posted inon the move

That worked even better than I expected. #commodore #fixallthethings

Posted bymrdoornbosMay 4, 2021Posted inon the move

This might be the worst non chicklet keyboard I’ve ever used.

Posted bymrdoornbosMay 4, 2021Posted inon the move

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

Posted bymrdoornbosMay 4, 2021Posted inon the move

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.

Posted bymrdoornbosMay 3, 2021Posted inon the move

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

Posted bymrdoornbosMay 3, 2021Posted inon the move

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

Posted bymrdoornbosMay 3, 2021Posted inon the move

Today on my operating table is my very reliable Evinrude 50. Just changing the plugs, it’s not even sick or anything.

Posted bymrdoornbosMay 2, 2021Posted inon the move

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