3 ms·

Some demos offloaded work to the 1541 - https://csdb.dk/release/?id=820 https://csdb.dk/release/?id=820

by leibnitz27 9mo ago

badc0ffee 9mo ago
Some run entirely on the 1541 - https://www.youtube.com/watch?v=zprSxCMlECA https://www.youtube.com/watch?v=zprSxCMlECA
- slfnflctd 9mo ago
  Just when I think the demoscene can't blow my mind any further, it breaks through another unexpected wall. The part where he starts cutting into the cable threw me for a second before I realized where it was going, I actually yelled "WHAT?!" out loud. Seriously unconventional hacking.
  - anthk 9mo ago
    That's nothing; there's an Amiga demo where it runs in the machine without touching the Motorola CPU ever.
    - coldcity_again 9mo ago
      There's a whole open challenge[1] - but you might be thinking of this[2] prod. [1]:https://github.com/askeksa/NoCpuChallenge https://github.com/askeksa/NoCpuChallenge [2]:https://www.pouet.net/prod.php?which=104753 https://www.pouet.net/prod.php?which=104753
rbanffy 9mo ago
Can you upload code to be executed on a stock 1541/1571? Would be fun to see the drive doing things like "read this file, but sorted on columns 3-10" or "add these two files line by line into a third file".
- mkesper 9mo ago
  Absolutely. The eprom of TFA was only needed for standalone usage. But 2K of RAM are not much.
  - is_taken 9mo ago
    As usually the schematics were available in the manual it was not too hard to add some additional static ram. There were unused address lines available which could be used for chip select.
  - rbanffy 9mo ago
    If the OS could load specific code into the drive memory. It’s a bit how “channel programming” worked on mainframes. Not sure modern ones still get advantages from that.
- quux 9mo ago
  Yes you can, back in the day this is how fast loaders worked, they uploaded an optimized serial protocol to the ram on the drive and called into it.
- reaperducer 9mo ago
  Can you upload code to be executed on a stock 1541/1571? Yes. There were disk duplicators that ran entirely on the drives. You'd upload the program to a pair of daisy-chained drives, put the source disk in one, and the destination disk in the other and they'd go about their business. You could then disconnect the computer and do other things with it while making all the disk copies you wanted. I've always wanted a modern equivalent. I thought FireWire might make it happen, but it didn't. And it's my understanding is that USB doesn't allow this kind of independent device linking. The closest thing I've seen in modern times was a small box I got from B&H that would burn the contents of a CF card onto a DVD-RW.

Some demos offloaded work to the 1541 - https://csdb.dk/release/?id=820 https://csdb.dk/release/?id=820

badc0ffee 9mo ago

Some run entirely on the 1541 - https://www.youtube.com/watch?v=zprSxCMlECA https://www.youtube.com/watch?v=zprSxCMlECA

slfnflctd 9mo ago
Just when I think the demoscene can't blow my mind any further, it breaks through another unexpected wall. The part where he starts cutting into the cable threw me for a second before I realized where it was going, I actually yelled "WHAT?!" out loud. Seriously unconventional hacking.
- anthk 9mo ago
  That's nothing; there's an Amiga demo where it runs in the machine without touching the Motorola CPU ever.
  - coldcity_again 9mo ago
    There's a whole open challenge[1] - but you might be thinking of this[2] prod. [1]:https://github.com/askeksa/NoCpuChallenge https://github.com/askeksa/NoCpuChallenge [2]:https://www.pouet.net/prod.php?which=104753 https://www.pouet.net/prod.php?which=104753

rbanffy 9mo ago

Can you upload code to be executed on a stock 1541/1571? Would be fun to see the drive doing things like "read this file, but sorted on columns 3-10" or "add these two files line by line into a third file".

mkesper 9mo ago
Absolutely. The eprom of TFA was only needed for standalone usage. But 2K of RAM are not much.
- is_taken 9mo ago
  As usually the schematics were available in the manual it was not too hard to add some additional static ram. There were unused address lines available which could be used for chip select.
- rbanffy 9mo ago
  If the OS could load specific code into the drive memory. It’s a bit how “channel programming” worked on mainframes. Not sure modern ones still get advantages from that.
quux 9mo ago
Yes you can, back in the day this is how fast loaders worked, they uploaded an optimized serial protocol to the ram on the drive and called into it.
reaperducer 9mo ago
Can you upload code to be executed on a stock 1541/1571? Yes. There were disk duplicators that ran entirely on the drives. You'd upload the program to a pair of daisy-chained drives, put the source disk in one, and the destination disk in the other and they'd go about their business. You could then disconnect the computer and do other things with it while making all the disk copies you wanted. I've always wanted a modern equivalent. I thought FireWire might make it happen, but it didn't. And it's my understanding is that USB doesn't allow this kind of independent device linking. The closest thing I've seen in modern times was a small box I got from B&H that would burn the contents of a CF card onto a DVD-RW.