4 ms·

This reminds me of a story of how Logo was implemented on 8-bit microcomputers. Leigh Klotz was the man who ported MIT Logo to the Apple ][ and then the Commod

This reminds me of a story of how Logo was implemented on 8-bit microcomputers. Leigh Klotz was the man who ported MIT Logo to the Apple ][ and then the Commodore 64. According to him “The Commodore 64 CPU 6510 has a bidirectional parallel port at location 0 and 1, taking up 2 of the 256 "page zero" locations, which are the only ones you can indirect through. When I ported MIT Logo from the Apple II, there were lots of places that dereferenced nil without checking, and those caused crashes. Commodore gave me a chip they fabbed in qty 12 yield that brought out the I/D decide status as a pin, and we used a Nicolet-Paratronica logic analyzer to feed the address and data bus to a Pet running a BASIC disassembler. I could then set a breakpoint in-circuit to see the 256 instructions prior to or after the errant memory access, so I could go put on guard code...” I got it from Jamie Zawinski's weblog. Be forewarned. Following the link from Hacker News will lead to an unsavory image. Just copy & paste it, instead. https://www.jwz.org/blog/2018/11/weird-machines/#comment-192213 https://www.jwz.org/blog/2018/11/weird-machines/#comment-192...

js2 8y ago
Safe clickable link via deferrer: http://www.dereferer.org/?https%3A%2F%2Fwww%2Ejwz%2Eorg%2Fblog%2F2018%2F11%2Fweird%2Dmachines%2F%23comment%2D192213 http://www.dereferer.org/?https%3A%2F%2Fwww%2Ejwz%2Eorg%2Fbl...
johnwyles 8y ago
DDoS of brogrammers and financially obsessed man-children. I think he nailed it. However the content in his pages is very lightweight and hosted in AWS it looks like so maybe that referrer logic pre-dates him hosting it and the DNA Lounge website there and... also because what he has to say is certifiably true. Good laugh.
nikofeyn 8y ago
why does hacker news redirect the link like that? isn't this a major bug and security issue?
- jachee 8y ago
  It's JWZ's way of expressing his opinion of HN, by serving up content when HN is the referrer.
  - nikofeyn 8y ago
    oh. i didn't even notice the words at the time, probably because i wasn't looking for it since i had no idea who this person is. i had made the assumption that hacker news' link shortening did something to it.
    - cmbailey 8y ago
      HackerNews doesn't impose any link shortening. Which is great.
msla 8y ago
Oh, joy. Now we have to have a disucussion about jwz' anti-autistic bullshit.

js2 8y ago

Safe clickable link via deferrer: http://www.dereferer.org/?https%3A%2F%2Fwww%2Ejwz%2Eorg%2Fblog%2F2018%2F11%2Fweird%2Dmachines%2F%23comment%2D192213 http://www.dereferer.org/?https%3A%2F%2Fwww%2Ejwz%2Eorg%2Fbl...

johnwyles 8y ago

DDoS of brogrammers and financially obsessed man-children. I think he nailed it. However the content in his pages is very lightweight and hosted in AWS it looks like so maybe that referrer logic pre-dates him hosting it and the DNA Lounge website there and... also because what he has to say is certifiably true. Good laugh.

nikofeyn 8y ago

why does hacker news redirect the link like that? isn't this a major bug and security issue?

jachee 8y ago
It's JWZ's way of expressing his opinion of HN, by serving up content when HN is the referrer.
- nikofeyn 8y ago
  oh. i didn't even notice the words at the time, probably because i wasn't looking for it since i had no idea who this person is. i had made the assumption that hacker news' link shortening did something to it.
  - cmbailey 8y ago
    HackerNews doesn't impose any link shortening. Which is great.

msla 8y ago

Oh, joy. Now we have to have a disucussion about jwz' anti-autistic bullshit.