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sigtau

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Everything posted by sigtau

  1. Two questions: Classic or Classic II? I couldn't tell from the video. What version of System is that? I want to say 7.0.1 but I may be wrong. The question then would be if later Macs suffer from similar issues.
  2. There is no video RAM inserted at all, and I don't have an external video card to test with. I've done a fresh PRAM and CUDA reset as of this post, and still no change in the board's behavior.
  3. Capacitor issues around the audio DAC chips in anything from the II, LC, or (Color) Classic series' usually results in dead, or very faint, sound. That would be my first suspect too. To test it out, you can first desolder and replace the caps around the TI amp/dac chip, which should be labeled 343S0129, and then try powering it on to see if you get sound. Warning: If you go with tantalum chip capacitors like most of the people around here do, note that the polarity stripe on tantalums denotes positive, and not negative. Certain tants can be quite explosive if connecte
  4. ROMs are not socketed, it appears to be some kind of single chip, like a PLCC or something to that effect. I don't know which it would be, there are no DIP chips on the board. And I think I mis-wrote that post: I tried Apple Hardware Test and it wouldn't boot, but then tried a separate program, TechTool Pro, which tests all hardware facets you can throw at it, and it crashed immediately. OS 9.1, no extensions. I have a second CPU and I swapped that out, and it crashed with that one too. Performing a CPU test with both also crashes it. The RAM test, however, succeed
  5. Results: I couldn't get the Apple Hardware Test to boot, but I could get it to run TechTool Pro to run on it, which upon attempting a full test of hardware, crashed immediately upon testing the L1 cache. I swapped out the CPU, got the same result, though a markedly faster boot time. I removed the cache module entirely, now doesn't boot at all (powers on, but the power light does not turn on, sits there with seemingly no activity on disk or on screen). Another thing I forgot to mention: when booting after being unplugged when I work on the inside, the computer firs
  6. I've tried every stick individually to no effect. The contacts have been cleaned. I'll try an actual RAM test next.
  7. Troubleshooting advice would help too, but I am fairly certain I have a PM G3 beige minitower that is on its way out. Fresh PRAM battery, all expansions removed, minimal system connected (with the exception of a SATA card later on). Power supply voltages are golden, within 10% or less of the rating. Symptoms: No chime at boot but it does boot. OS 7.6.1 and 8.0 can play audio through the speaker when using them in a Norton Utilities envrionment, so I know that part at least works. Boot RAM test takes a very long time. After a long period of being unplugged, nuked PRAM
  8. I wasn't aware of these... but now I'm tempted to try them. I think the biggest issue with these might be that you have to find a short enough SCSI cable to accommodate it, because the v5 only fits horizontally into the bay, rather than vertically, and the laptop's own ribbon cable cannot be turned or twisted without damage because it is designed to fit a particular way. Also, the PB SCSI is 40 pin, and is being adapted to 50 pin, so this may be useless for the purposes of a powerbook. Apple being proprietary Apple, as always! Might help with those early Toshiba lapto
  9. Oh, hey, this actually garnered interest! So the first run I ended up accidentally orienting the plug incorrectly and--if I hadn't noticed sooner--would have almost fried my v5 SCSI2SD. It's my mistake because I think I expected the mini-scsi connector to be oriented one way when sketching the schematic, then oriented the PCB backwards. As it's very cheap to manufacture the boards I plan on doing a second, revised run this month. If you want one, reply to this thread or PM me as I have a e-mail notification for this thread, I'll get to you when the time comes here in May.
  10. Excellent! Thank you for the insight. Whatever I end up sticking with I'll make sure the 64k ROMs remain safe as those seem to be the more valuable piece between the two.
  11. I have an original 512K and I'd like to see if it's possible to get it up to 512Ke standards (800K floppies, etc). Would I need to simply transplant Plus or Ke ROMs into the 512K, or is there more involved? Furthermore, is it even possible/practical?
  12. I did end up finding this thread: http://www.oldschooldaw.com/forums/index.php?topic=433.0 I've composed a Windows 98 bootdisk, attached below, as a 1.44mb floppy image, with the firmware onboard. I will try it when it arrives, and if not, no harm done. These cards are common enough, and I can always brute-force it by programming the ROM directly. W98_SATA_3112_Mac.img
  13. I've got a PB3112SATA150 card coming in the mail. I've read on here that it's possible to flash the chipset to be bootable in the Beige minitower G3 but I have no idea where to begin/what to search on how to go about doing this. Anyone have a link/guide/pointers on how to do this? I have a few PCI-compatible PC motherboards I can pop it into to do the deed.
  14. Absolutely. As I said in PM, I'm building two variants and I want to see which one fits more snugly--SCSI2SD beneath it or above it. They are cheap to produce individually ($.50 per board, $3 for the connectors) and will likely be dirt cheap in bulk. The one I have posted here so far fits ABOVE the SCSI2SD.
  15. The first batch has arrived! I'm about to head off for Christmas but I'm going to order the parts from DigiKey or Mouser in my absence and they should be there by the time I get home. It fits snugly in less than the size of a PB-SCSI hard drive, leaving just enough overhang for the SCSI2SD v5 to fit in the remaining space.
  16. Yep, mine actually sits underneath the SCSI2SD which may imply needing insulation between the SCSI2SD board and the breakout board. Any stick-on foam pads should do the trick. Absolutely open, under the CERN Open Hardware license. Gerber files attached below, untested as of yet. I have tried SCSI2SD in a beige G3 and it seems reasonably fast. My biggest issue thusfar has been getting it to prioritize SCSI over IDE in cases where both are present, but that really isn't the SCSI2SD's fault. To everyone: I actually updated the board design to use larger traces before
  17. While I'm aware that the Powerbook edition of the SCSI2SD does indeed exist, they can only be manufactured in limited runs due to their design being in significantly lower demand than your run-of-the-mill SCSI2SD, per a conversation I had with Interial via PM. To this end, I took it upon myself to design a PCB that bridges the pinout of the 40-position SCSI connector (at least, the one I have in my powerbook duo 250) to the pinout of a 50-position SCSI ribbon connector, for cases where you may have a v5 board on hand or if you need to test the SCSI header on the board without having to wait f
  18. I'm working on the assumption that your 128k is not a 512k upgrade and that it doesn't have socketed chips. Now would be a good time to install sockets if you suspect more RAM may fail in the future. I also assume that the RAM is addressed sequentially. If the chips are interlaced (i.e. chip 0 is the first bank, chip 2 is the second, chip 1 is the third, or something silly like that) someone please correct me. Correct me as well if I'm totally off base here because this is a whole load of assumptions due to me not having a 128k to compare. 8 kilobytes per chip in a stock Mac 128 (64
  19. Okay, confirming here that installing four 256K SIMMs and replacing R8 did, in fact, permit it to boot, indicating this is an issue with the RAM I was using. All of these RAM sticks have tested good in the past using an old build of memtest on a 486 motherboard, so it's not necessarily that they are bad sticks, but maybe because of parity, timing, or ECC. EDIT: It turns out, one of the SIMMs was indeed bad. Per recommendation of users in IRC, testing in a 2.5MB configuration to narrow down the bad SIMMs one at a time has isolated the bad stick. I have procured another 4MB set and the
  20. IIsi has considerably easier caps to replace than, say, the IIci or IIcx. The caps for the audio filter circuit are in the northwest corner of the board (if 'north' is where all the rear ports stick out). If replacing those fixes your audio issue, you know the caps were bad.
  21. Thought it would be better to have a separate topic so anyone finding this by search/Google could see it more easily. I installed four 9-chip, 30-pin 1MB SIMMs into my newly built Plus, and when it boots upon performing its RAM test, I get a Sad Mac code 030ff0. Googling around indicates the first byte (03) indicates a memory failure, and the latter two bytes indicate which chip failed, although since it's a set of SIMMs that isn't a terribly helpful number. I have several sets of this type of RAM laying around and I've tried different combinations and it doesn't work. Occasionally,
  22. Easy way: Open up the case, look for areas where it isn't coated in the ferric material but hasn't been exposed to sunlight, compare that color to the exterior. Hard way: Probably a serial number, but FWIW, mine was one of the M0001A variants that did not list memory on the back (i.e. Macintosh Plus 1MB)--it just said "Macintosh Plus" and it was Platinum.
  23. It works! It chimed this afternoon with all the parts inserted. However, there's no picture, despite adjusting the screen control pots. The CRT is definitely receiving some amount of energy as I discharged the anode cap without issue. The cap had a hook broken off inside but a solder bodge later and that was fixed. I think I may try reflowing the analog board as a first shot to debug this thing. I also have the parts needed now to recap it. If not that, then just procuring a new analog board shouldn't be too bad.
  24. I ended up buying some 8-32 type machine screws with a philips head to secure the parts on the inside so that I could save the remaining Torx driver screws for exterior casing and key parts like the CRT. They grip fairly well, and it's no issue--89 cents for a box at Menard's. In the meantime, I've retrobrited a bunch of stuff. I am also having to repaint the Apple logo because it's just faded so terribly, it looks like a 30 year old VHS tape but in real life. Enamel paint spreads very, very, very well, so I have to mask each of the Apple stripes off individually. I can't use normal
  25. I guess since this is a good Beige thread to ask questions in, is there a known issue with Mac OS beyond 8.1 that causes it to only play sound through the Personality Card? I have the AV Personality in mine, and while it all appears to be in working order, only when I boot from the FWB utility disc (which is running 8.1) do I get sound from the internal speaker--it seems to only want to redirect through the personality card in versions later than 8.1. I just wanted to make sure this is a known thing, and if there's a driver or somesuch I need for 9.2.2 to recognize both the built-in audio
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