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Michael Doornbos

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Category Archives: on the move

Why are PAL VIC-20 (CR) video output circuits wired like the left and NTSC like on the right?

Posted bymrdoornbosJune 2, 2021Posted inon the move

Before morning workout progress: This is the last of these before the refactor to do large sets on an unexpanded VIC-20. This one cheats and uses a 128 to do 30k DIMs. #commodore

Posted bymrdoornbosJune 2, 2021Posted inon the move

SUPER happy with this so far. Generating 100 random mod 256 integers with a Lagged Fibonacci Sequence, then test the distribution for randomness-Monte Carlo value for pi (is it in the circle?) on an unexpanded VIC 20 #commodore #embracecontraints

Posted bymrdoornbosJune 1, 2021Posted inon the move

Well, that random distribution count really sucks. Gonna have to work on this algorithm a lot more… In 10000 iterations, 1 came up 358 times and 2 came up 1669 times. Bleh.

Posted bymrdoornbosJune 1, 2021Posted inon the move

Sometimes during conference calls I do weird things.You know, like write a Lagged Fibonacci Generator (PRNG) on a VIC 20…

Posted bymrdoornbosJune 1, 2021Posted inon the move

Headed out for a holiday cookout, but while I’m waiting for everyone… I need top 500, 1000,10k and 50k English word files in SEQ files. Was simple enough

Posted bymrdoornbosMay 31, 2021Posted inon the move

I’ve read a lot of marginal documentation over the years. This one is in the bottom 5 of all time. I’ve read it twice and I still don’t know how to do anything with it.

Posted bymrdoornbosMay 29, 2021Posted inon the move

Done a fair amount of Commodore Assembly now but never on the VIC 20. No time like the present. Seems simple enough but I’m going to have to find a decent editor, the monitor method only works so long.

Posted bymrdoornbosMay 28, 2021Posted inon the move

Another new to me VIC 20 “untested” and cheap. Looks good, packed well and passes tests. Sweet.

Posted bymrdoornbosMay 28, 2021Posted inon the move

Back to implementing Enigma. These rings are obviously horizontal for testing, but top down they are left, middle and right. Middle should rotate when right(bottom) gets to V (the “notch”) and top when middle gets to E. Making progress…

Posted bymrdoornbosMay 28, 2021Posted inon the move

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