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Michael Doornbos

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Category Archives: on the move

15 years after we landed on the moon, a Commodore 64 running BASIC could find the prime numbers between 1 and 10000 in 16 minutes. Same algorithm in Python on a MacBook: 0.04 seconds. Rust: 0.002 seconds. What are you doing with this power? Nothing. Lame.

Posted bymrdoornbosApril 20, 2021Posted inon the move

This satellite tracker is very cool. You have to hand enter the TLE data which isn’t a big deal. It’s in BASIC though so just oh so slow ;-) #commodore #c64 #hamradio

Posted bymrdoornbosApril 20, 2021Posted inon the move

Gonna try to do a Commodore 64 to Commodore 64 Packet session THROUGH the ISS with @K0FFY_Radio. The only thing I was missing was a TNC, so I picked this one up that’s a HAT for a Raspberry Pi. If it works, it’ll be nice and portable.

Posted bymrdoornbosApril 19, 2021Posted inon the move

Loving the collaboration between @DarrenFouldsand @8BitShowAndTell so much it’s my office theme today. Even running on a real floppy for the occasion.

Posted bymrdoornbosApril 19, 2021Posted inon the move

Made a Python, Assembly and BASIC version of RC4 encryption on old computers. Other than questioning my existence on earth for a few days in the process, it went swimmingly!

Caution: Reading ahead https://imapenguin.com/making-and-breaking-ciphers-on-the-commodore-64-part-8-rc4/

Posted bymrdoornbosApril 19, 2021April 19, 2021Posted inon the move

Oh. My. God. THIS mistake took me hours to see. HOURS. Okay, NOW I have a working RC4 in Python, Commodore BASIC, and Commodore Assembly. I need a drink.

Posted bymrdoornbosApril 17, 2021Posted inon the move

RC4 in Assembly is still kicking my butt. This is close but wrong. The python and BASIC versions took and hour, I don’t know how long I’ve been at this version this week, but I still don’t have it. Sigh.

Posted bymrdoornbosApril 17, 2021Posted inon the move

Trying out a thing on Fridays I’m currently calling “The Nostalgia Files”. In this first one I reveal my favorite book of all time.

Read it here.

Posted bymrdoornbosApril 16, 2021April 17, 2021Posted inon the move

RC4 in assembly… stuck on the nested loops with a double position swap. This one is making my brain hurt. I’m sure it will seem obvious once I get it but I’m putting it down for the evening.

Posted bymrdoornbosApril 15, 2021April 17, 2021Posted inon the move

Some new additions to our library

Posted bymrdoornbosApril 15, 2021April 17, 2021Posted inon the move

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