Jump to content

paws

68000
  • Content Count

    1097
  • Joined

  • Last visited

About paws

Profile Information

  • Location
    Copenhagen

Recent Profile Visitors

The recent visitors block is disabled and is not being shown to other users.

  1. Yeah, those could work as well! Supposedly also some of the MAX II and MAX V CPLDs from Intel/Altera, by use of an external resisting (current limiting, I'm guessing): https://www.intel.com/content/www/us/en/products/programmable/cpld/max-ii.html https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/pt/max-ii-product-table.pdf https://www.intel.com/content/www/us/en/products/programmable/cpld/max-v.html https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/pt/max-v-product-table.pdf
  2. I'd love to hear about these projects you allude to btw.
  3. I don't know much about GALs, but from those equations it looks like it's just combinatorial logic? I've been playing a bit with the Lattice FPGAs that somebody made an open source toolchain for, and if I'm reading this correctly it'd be extremely simple to implement in one of those. The syntax is a little different but you could probably translate those equations to Verilog with a bit of your favourite text munging tool. There are two problem with picking out a device: first of all, voltages, of course, since nothing modern is going to like 5V. You can still get some 5V parts, both FPGA and CPLD, but quickly glancing at Digikey, there's not really anything that has the ~90 i/o I'm counting for this board - they're mostly smaller ones. The big ones are all obsolete and very expensive. If you could accept using two or three it looks more managable, e.g. the Xilinx XC9500XL series. Level shifting is of course totally doable, but at that point I'd probably start thinking about whether you want to use a real '030, and not get a perhaps slightly bigger chunk of programmable logic and stick a soft core in there. That'd make business sense, but maybe not aesthetic sense... (and that's not being snarky - I've actually spent the past few days desperately resisting the desire to make a board with a smallish FPGA and a 68SEC000, a 3.3V 68k that's still in production)
  4. paws

    PCMCIA SD Card - Compact flash

    Not tried that, but I have a very generic-looking PCMCIA SD card reader that works fine with my Lombard.
  5. paws

    Recapping Macintosh IIci?

    This'd be a great service, I think.
  6. paws

    China Ebay 68040 processor

    Mine says FPU: Built-in Hardware FPU: Yes.
  7. paws

    China Ebay 68040 processor

    Well, mine just arrived and it appears to be a genuine full 68040, 33 MHz, according to TattleTech. This was the auction: https://www.ebay.de/itm/361225888013 I give them a low offer first, they returned with 43USD.
  8. paws

    Dead Performa 475

    I have 132 mb in the Quadra 650 I'm putting together. It takes ages to boot and I can't see myself ever using half of it, even doing audio. Nice job on the troubleshooting here.
  9. paws

    China Ebay 68040 processor

    Gulp. I just ordered a 33 mhz 68040 from Hong Kong. Hoping it'll be a good one, will be sure to report back.
  10. paws

    Macintosh 7100/66 Fried PSU

    Hi, I can't help you much with troubleshooting, but generally in electronics just become something burns doesn't really mean it was causing the problem, it just means that something went wrong, somewhere, and this part was the one that couldn't take it. The most common type of component to fail is electrolytic capicitors. They're often used as filters, and as they get older they dry out and don't filter as well as they used to. I have heard of that causing other components to give out like this. This board looks quite badly damaged, though, I'm not sure how much time I'd spend on it.
  11. I have an Acard thing that I've used both for spinning drives and CF cards in adaptors.
  12. paws

    Ethernet via SCSI2SD V6

    The problem is mainly convincing the Mac to speak ethernet across the SCSI bus and getting the STM32 to turn that into into something we can use. Depending on what actually goes over the SCSI bus, this can be quite trivial or require lots of reverse engineering. Networking on the STM32 side is not too much of a problem, IP stacks and drivers for USB networking devices exist in the open,I've tried turnkey demos for at least ChibiOS. I'm not sure what the Pi would do, although I suppose it can act as a cheap and flexible USB->Wifi dongle. Scuzzygraph is interesting, but it says that it has an "intelligent graphics processor" so unless you're emulating that on the "modern side" of the equation its drivers aren't going to be much use. But it is an interesting concept.
  13. paws

    Newton Documentary

    This was very enjoyable. Also thank you for making it available via Vimeo so I could just download the file and play it locally.
  14. Thanks for the info. I actually have a Mac Mini Core Duo with 10.6 collection dust, I'll try it on that.
×