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  1. In my experience any OS 9 compatible USB card will work in 8.6 with the USB extensions copied from OS 9. Even simple devices like a mouse will probably only work once you reach the desktop though, so the Wombat is a more comprehensive option, even without considering non-PCI macs.
  2. The second link in my post is the Apple tech note, but it's not really any help other than to show Apple disclosed this officially. I'll defer to the wisdom of those who know the Catalyst platform better, but if I recall correctly the 7200 was an entry level version of the 7500, both of which are significantly different from the 7100, which was before the PCI "PowerSurge" redesign. Other notes also point out it used a 64-bit data path rather than 128-bit and therefore didn't support interleaving, which all other PowerSurge machines did. I suspect the memory controller was created a
  3. 7200 requires 5v memory just like most others of the time (3.3v and 5v modules are keyed differently and should never fit the incorrect slot.) The issue here is EDO vs FPM, and Apple did officially state this incompatibility, though unfortunately there's not much technical info on what goes wrong... https://www.macgurus.com/products/motherboards/mbppc7200.php https://web.archive.org/web/20070812065510/http://docs.info.apple.com/article.html?artnum=20101
  4. Glad you got that 550c board! I've seen this symptom before, but never nailed down exactly what causes it. In my case though, it may have been related to damaged resource forks, or damaged/non-ideal disk format. If you have a running Appletalk share, try running the apps from the mounted share rather than the 540's boot drive. I only found one similar case online, and in that case it seemed the file was on a damaged section of a floppy diskette. - https://discussions.apple.com/thread/4092030?answerId=18887689022#18887689022 You can also run the memory test in Apple Per
  5. I noticed a number of official references to a Macintosh 19" Color Display (circa 1994, mostly in service manuals for the x100 series machines.) Supposedly a 1024x768 tube, though I can't seem to find any evidence that it ever existed. https://www.google.com/search?q="Macintosh+19"+Color+Display" Anyone know more?
  6. I'm using a SanDisk CF card in a generic adapter (CF is logically compatible with IDE.) https://www.amazon.com/gp/product/B00NUB2TWI https://www.ebay.com/itm/271583773005 I bought over two years ago, but the same listings are still live, so these should work for you. Be sure to insert the 2.5" adapter correctly, as there's nothing to prevent it from being installed in reverse. I have my 2.5" IDE cable folded 180 outward towards the open back, so that the CF card assembly pushes against the inside frame to stabilize it. The cable keeps enough tension on it to hold i
  7. The slow SCSI bus is connected to the external port as well, so as to be compatible with most cabling without issues. Those hooks stabilize the CPU daughtercard when the case is closed, so don't route cables there or you'll pinch them/stress the CPU & logic board. Those bottom bays didn't have factory cabling in my experience, but they may have in the Workgroup server configurations, which included a 40MB/s 68-pin Jackhammer PCI card. You could also use a SATA or IDE PCI add-in to utilize the bays that way, but if you found an adequate SCSI cable you could route all the bays to your intern
  8. I know, but I chose HFS for my 8.1 install primarily so it would be accessible when I'm booted to 7.6.1, though with @elliottnunn's revelation below I may revise this.
  9. I don't have it in front of me, but I believe 7.6.1 and 8.1 are both Mac OS Standard (HFS) each 2 or 4GB (can't remember.) 8.6 and 9.1 are HFS+ (Extended) and divide the remainder of the space.
  10. 8.6 will run with OS 9's extensions for Firewire and USB. Architecturally, It's quite similar to 9.0-9.0.4, just not as built out with features, so it is a bit lighter weight, but application compatibility will mostly overlap, even for softwares that advertise only OS 9 compatibility. I installed a 128GB CF card on my TAM's internal IDE, and partitioned it for 7.6.1, 8.1, 8.6, and 9.1. Running with the stock 603ev I prefer to stay on 7.6-8.1, but with a G3/500 even 9.1 is as snappy as you can ask for classic Mac OS. Anything that won't perform adequately at 500MHz is likely hitting
  11. I just dragged this one in from ebay, it needs some attention to say the least but confirms your part number.
  12. These will accept any signal within their range. Mine works fine in 6.0.7 on my IIfx, though on cards that do not support software resolution switching a dipswitch adapter is needed to change to resolutions above 640x480. This is a limitation of those older video cards, not the monitor.
  13. Good to hear you have it working! I run mine in a Mach V board as well, so it's not an inherent design defect. The 'divide by zero' error is what I expect to see with no NVRAM patch, but it should always chime with video output if it's connected properly. I think you can restore the NVRAM patch using a Sonnet diskette if you zap it, rather than needing to revert to the 604ev. Holding shift may also work... Is there a current source for 128MB modules for these? I tried Memoryx a few years ago, but the modules all read as 64MB, despite a pair of OWC ones reading correctly... Oh well,
  14. Yes- the video connector on the card is driven by the RAMDAC reading from the card's VRAM every screen refresh, and likewise the internal video is drawn from the onboard RAMDAC, which pulls data from the expandable VRAM on the logic board. The RAMDAC reads from the VRAM extremely fast- 640x480x8-bit@67Hz is already 20MB/s, and a nicer Nubus' 1152x870x24-bit@75Hz is 215MB/s! (this is why high end RAMDACs and large VRAM frame buffers were expensive.) Even if you just wanted the Nubus graphics processor write to the onboard VRAM during instructions, it would require interrupting the C
  15. Leads on this are pretty cold... it's a SuperMac SpeedCard Thanks to this eBay seller we know what the driver diskette looks like, and handily the front cover of the manual shows a screenshot of the System 6 control panel, indicating that the cdev is likely just called 'SpeedCard.' Perhaps they or a future buyer could be persuaded to image the diskette. https://www.ebay.com/itm/0006279-0001-SUPERMAC-SpeedCard-for-Macintosh-SE-16MHz-68000-Accelerator-Card-/142361808825 Other than that, there was mention of one in a collection here in 2007 and another on arstechnica
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