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Everything posted by paws

  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.
  15. I have a 1 GHz G4 iMac that I use for running a few music applications under Tiger. One of them is a bit heavy, and sometimes I think about getting a G5 iMac to replace it just for performance, although I much prefer the look of the G4. Does anybody know in some sort of numbers how big the performance difference is? Only thing I know for comparison is that my Sawtooth is quite a bit slower than the 2x2.0 PMG5 I used to have, but I'm assuming this would be much less drastic.
  16. The main programme I want to run (Reaktor 4) is PPC only, unfortunately, and I don't want another tower here, so the G5 iMac is my only option. 1.5x would be worth it though. Thanks for you reply.
  17. Slight derail: Is it possible to make a passive ADB splitter? Like, take three female connecters with the datalines wired together to attach two peripherals to the same host? Is that basically what the extra connector in ADB keyboards are?
  18. Hello. I've been poking around my Sawtooth and Lombard, and I just now noticed that the modem in them is identical. I know that there existed boards for the PowerMac towers that added a serial port by replacing the modem and looking at pictures of the Stealth ports as well as the datasheets for the chips on the modem, it looks like a new board would be simple to make. This interests me, since I've been learning to make PCBs and I would like a serial port on one of my Macs for an old MIDI interface. I'm wondering if anybody has the pinout for the connector on the motherboard. (Actually, I'd love to see the schematics for any of these new-old Macs)
  19. Welp - you snooze, you looze! http://alexhixon.com/jamport/index.html
  20. paws

    IDE to SD adapter in a Pismo?

    I've heard (but not personally confirmed) that with early-gen New Worlds (and Old Worlds I'd assume) you have to stay below 127GB for the Mac to want to boot. I'd assume this also applies to anything on the other side of an adaptor.
  21. The USB modem from the iMac G4 shows up in my backup Gigabit Ethernet tower under OS X, so there is a USB connection of sorts on that header as far back as that. It's a seventy pin connector, and handful of them are for serial, another two for USB...
  22. The Lombard sees and talks to it fine, but it gets in the way of the keyboard so you can't actually reassemble it.. It'd definitely be possible to make one that fits, though, if anybody really wants a serial port in a Lombard or (I'd expect) Pismo. Does anybody have any idea what the type/part number of the connector is?
  23. Hey. Been working on something else for a bit when two of the GeeThree Stealth G4+ ports showed up for sale locally. Snagged 'em, and put one in my Sawtooth that runs 9.2.2. This works of course. Unfortunately I don't actually have a proper cable, must of lost them in the Great Disaster of '09 (left a bag of cables behind when I moved), but I've got a mini din-8 -> db9, and this works for talking to a Soekris board. It also works in my 1GHz OS X-only G4 iMac, which is not on the compatible models list. I don't have a screwdriver small enough to remove the modem port here, so I've just got the cable running between the top and bottom parts. Hopefully there's a solution. One thing that's interesting is that the iMac modem board is the same connecter, but the actual modem is USB-based, so they must be using different pins for that. Do wonder what else is lurking on that connector! I'd expect it to work in the Lombard as well, but there are obvious physical difficulties here too. From pictures, the module in the G4 Mini is different, but it might actually be the same as the one for the G5s. I hope to post a pinout soon for anyone not lucky enough to find real ones, it's plainly simple stuff
  24. paws

    ANS 700

    Hm, usually for me breaking in to Macs involves starting in single-user mode and resetting the root password. This is much cooler.