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  1. Thread: Petsd

    by Eudimorphodon
    Replies
    17
    Views
    1,212

    I'm curious, does this new version support the...

    I'm curious, does this new version support the BASIC 4.0 disk access commands (and relative files), or is it still mostly program-loading only using the BASIC 2.0 syntax?

    With some luck (fingers...
  2. Replies
    10
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    217

    My gut feeling is you'd need a machine...

    My gut feeling is you'd need a machine significantly faster than a 286 (IE, something where ISA's limitations actually seriously start turning into a pinch point) and a very specialized application...
  3. Not really apropos of anything, but I thought...

    Not really apropos of anything, but I thought someone might get a kick out of this particularly obscure piece of Commodore video hardware history I dredged up to use on my project:

    For various...
  4. Poll: I was referring to this: And like I said,...

    I was referring to this:



    And like I said, from reading the creator's description at least, this card basically run the whole show; there's a Z80 attached to RAM hanging off the Raspberry Pi,...
  5. Little known trivia: Radio Shack was reluctant to...

    Little known trivia: Radio Shack was reluctant to release a hard drive for the Model I because the only prototype they could cook up needed to be cranked over by hand and it kept breaking users' arms...
  6. Poll: If you want a laugh here's my lo-tech approach....

    If you want a laugh here's my lo-tech approach. The big black chip in the lower left is an AVR324 that's programmed to do address generation and sync. (IE, it would basically be possible to rip it...
  7. Poll: The linked RC2014 card above uses a Raspberry Pi...

    The linked RC2014 card above uses a Raspberry Pi Zero, and essentially all it does is DMA. (It uses some external hardware glue to regularly pause the attached Z80 with the WAIT lines and block-copy...
  8. ... The IEEE topic opens up a whole can of worms,...

    ... The IEEE topic opens up a whole can of worms, actually. If this actually comes together I'm going to want some kind of storage device, but I'm badly torn how to implement that.
  9. I'm *pretty sure* cursor blink is done by...

    I'm *pretty sure* cursor blink is done by counting the vertical refresh IRQs. There's a mention of it in here, and I think I may have seen the code for this when I was ignorantly shuffling through...
  10. Poll: Just googled up RC2014, and looking at the...

    Just googled up RC2014, and looking at the structure of the bus... When you say "z380 with simple hardware compatibility", do you mean a single card with the CPU and all the 4P-specific parts on it,...
  11. Replies
    7
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    140

    The thing to watch out for is many cards newer...

    The thing to watch out for is many cards newer than the mid-1990's don't actually support "packed" 24-bit color (IE, three bytes per pixel), they need to use 4 bytes per pixel. (The extra byte can be...
  12. Poll: That's pretty much what I was talking about on...

    That's pretty much what I was talking about on the nose; Realtek is still churning out "full" 8019s and they also sell a similar chip which has the same core but it has some of the ISA-specific bus...
  13. Poll: Incredibly stupid idea: if you're confident/eager...

    Incredibly stupid idea: if you're confident/eager to get TRS/LS-DOS 6+ running on an eZ80 and the switch to the z380 is entirely forced on you because of the impossibility of achieving backwards...
  14. Poll: Another fact of life that's pretty much slam-dunk...

    Another fact of life that's pretty much slam-dunk argument for doing some kind of processor offload is if the goal is to let your Z80/6502/whatever actually "surf the web", access email, or do almost...
  15. Poll: To be clear, I'm pretty much agnostic about most...

    To be clear, I'm pretty much agnostic about most cases of using microcontrollers as elements for replacing obsolete/unobtanium hardware parts for "retrocomputing"; heck, right now I'm in the middle...
  16. VIA clock in Commodore PET: is it important it run at 1mhz?

    Resurrecting this thread with another ignorant question about arcane Commodore/6502-family obscurities. This is specifically about how the VIA is used in the PET.

    According to the datasheet the...
  17. Poll: Some of the other constraints that EtherNUT code...

    Some of the other constraints that EtherNUT code has to deal with is running on microcontrollers with as little as 4K of RAM (It's an IoT OS, after all) so I can imagine it's not *that* hard to push...
  18. Poll: I have to admit I'm not sure where realistically...

    I have to admit I'm not sure where realistically this would ever be a worry for a machine like this, especially if it's primarily in a client role instead of a server. Sure, if you're planning to...
  19. Poll: Hey, I don't mind hearing about CPLDs. ;) I'm...

    Hey, I don't mind hearing about CPLDs. ;) I'm still mucking around with GALs so they're a bit out of my league yet, but maybe one of these days...

    On the question of using as microcontroller to...
  20. Whoever told you that is misinformed. On a...

    Whoever told you that is misinformed. On a “standard” 1.44mb drive the density selection jumper directly controls the write current, if you insert a 720k disk (or a 1.44mb disk with the hole covered...
  21. Replies
    11
    Views
    464

    On the flip side, I sort of wish the XUB...

    On the flip side, I sort of wish the XUB configuration software would incorporate direct support for SST flash chips one of these days. The 128KB ones are massive overkill capacity-wise but they’re...
  22. The details give me a headache, but the long and...

    The details give me a headache, but the long and short of it is the circuitry that has to trap out the narrow bandwidth chroma pulses and compare them to the reference phase imposes significant delay...
  23. But the chroma data isn’t shoved into the back...

    But the chroma data isn’t shoved into the back porch, only the color burst lives there. (Which is the sync/phase reference for the chroma data overlaid/mixed on the luminance signal.)

    Sure, it’s...
  24. It's *possible* in CGA's case that IBM never...

    It's *possible* in CGA's case that IBM never actually thought of it and the fact that the hardware is capable of it is a happy accident resulting from sheer cheapness. (IE, it's possible IBM could...
  25. A stock 5170's going to have an MFM + FDC board...

    A stock 5170's going to have an MFM + FDC board in it, not IDE, of course. But if you put a generic IDE/FDC card in there and want to just play the "I'll pick the biggest type on the list" game......
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