mrdoornbos
@mrdoornbos • 3,491 subscribers
Engineer, pilot, outdoorsman, accidental storyteller, and founder of https://t.co/VtnYheQNBn and Evadot I'll likely be voiding a warranty today.
Videos
For the last few weeks, I've been writing a multi-CPU single-board computer like explorer. I'm calling it CROSSWOZ (Hat tip to Woz and the WOZMON). Seven vintage CPU cores (6502, 65C02, Z80, 8080, 8085, 6809, 1802) share a 64K memory bus and the same WOZMON-style monitor. I can swap CPUs in place. It's got a mini-assembler per CPU, JMON-style debug, and animated paper-tape I/O. I'm pretty pleased with how it's turning out.
mrdoornbos14,876 views • 25 days ago
When I was a kid, I learned SO MANY math and computing concepts from Logo on the Commodore 64. Recursion was a big one. As a seasoned technologist, I'm still blown away by how much they packed into a single 170kb floppy to give a simple 8-bit computer so much power and flexibility. It's only now that I've started playing with the built-in assembly language interfaces in Logo. Something that was completely over my head as an 11 year old. Here's the kind of thing I did a lot of in the 80s (and even understood most of what I was doing).
mrdoornbos13,544 views • 3 months ago
Continuing my fun with the Enigma machine: I wrote two emulators for a Commodore 64, one in BASIC and the other in Assembly (Turbo Macro Pro, coded on a C64). The BASIC version does about 3 characters per second. The assembly version can encrypt/decrypt roughly 1500 characters per second.
mrdoornbos12,491 views • 3 months ago
Osborne restoration day 5 continued: The real reason I wanted to get this thing working: 10 PRINT on all the things! I can now check Osborne 1 off of my list :) Left drive is now a Gotek and the right drive is a working floppy drive. Have some case work/cleaning to do so I left the front cover off. The iPhone doesn’t do justice to how good the screen looks in person. I’m really digging it. Time to do a happy dance. Another non working dinosaur computer now ready to do some serious computing.
mrdoornbos14,621 views • 1 year ago
Today's PicoCalc fun: Finding and printing all primes from 0 to 2^16. Because of memory constraints, I had to do it in 15000 integer chunks, but it's pretty fast. The print to console takes longer than the rest of the program. Pretty fun. We'll race a Commodore next.
mrdoornbos13,264 views • 1 year ago
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