Jump to content

Forums

  1. Important Information

    1. The 68kMLA Forum Rules   (9947 visits to this link)

      To quote vintage Apple manuals: "Read Me First!"

  2. Community Connections

    1. General 68kMLA News & Stuff

      What's going down in the barracks.

      3972
      posts
    2. Conquests

      Discuss your latest vintage Mac finds!

      39271
      posts
    3. Trading Post

      Feel free to trade all of your Mac goodies here with all honest intentions. The website provider assumes NO liability, so buyer beware! Please see this topic for more information.

      52503
      posts
  3. Projects & Hosted Forums

    1. RetroChallenge

      What can you do given only one month and strictly "retro" hardware? Find out with RetroChallenge!
      http://retrochallenge.org/

      1484
      posts
    2. 68kMLA Wiki

      The creation and maintenance of the 68kMLA's information repository.
      http://68kmla.org/wiki/

      483
      posts
  4. 68k Model Forums

    1. Compact Mac

      Macintosh, 512k, SE, etc.

      45237
      posts
    2. Mac II, Quadra & Centris

      Just think, having a Quadra 950 in 1992 would be like having a Mac Pro today… except with more slots, more expandability, and on-board SCSI!

      12887
      posts
    3. 68k LC & Performa

      Ah, the consumer computers!

      7889
      posts
    4. 68k PowerBook

      From the Portable to the 190cs.

      9739
      posts
  5. PowerPC Model Forums

    1. NuBus Power Mac, LC & Performa

      The NuBus architecture gets a new brain!

      2636
      posts
    2. PCI Power Mac & Performa

      The PPC comes of age and adopts the industry standard expansion slot.

      5858
      posts
    3. G3/G4/G5 Power Mac, iMac & eMac

      From the Beige G3 to the quad-core G5, via various iMacs!

      13689
      posts
    4. PPC PowerBook & iBook

      All that power in a laptop? Never…

      8952
      posts
  6. Everything Else…

    1. Apple I, ][, /// & Lisa

      Not really 68k Macs, but certainly Vintage!

      7317
      posts
    2. Newton

      The best PDA ever finally gets its own forum!

      1063
      posts
    3. Software

      Includes system stuff, productivity, emulation, design, and games for pre-OS X Macs!

      17354
      posts
    4. Hacks & Development

      Yes, it's back! Hardware hacks/modifications and software development for Mac OS.

      18361
      posts
    5. Peripherals

      Anything you can hook up to your Mac or stuff into it as an interface!

      14441
      posts
  • Posts

    • Monitor adjusted and the color looks great. Thanks @jessenator!
    • On my IIfx and Q950, the 'Serial Switch' control panel will enable a 'Faster' setting and a 'Compatible' setting in Mac OS. It could still be an over-simplistic method of engaging the IOPs, similarly to how the A/ROSE methodology allowed for complex co-processing, but in reality was only really implemented with memory move operations to reduce the number of interrupts the 030 directly deals with. There's still a dramatic difference when the 030 is under load while A/ROSE is utilized, despite this simplified implementation. Similarly, perhaps when data is relayed to the IOPs, the 030 is able to move to the next instruction faster than if it needed to control the serial directly.   I know A/UX is absolutely required to make use of the SCSI DMA onboard the IIfx and available with the WGS95 Pisces card, so it would make sense if A/UX also gave the IOPs more thorough attention.
    • I've been trying to get a Daystar P33 accelerator (50MHz 68030) working in an SE/30 with one of @Bolle's amazing adapters -- in this case the model from the early 2020, short form factor with Asante ethernet card underneath.   The P33 itself is faulty in some odd ways which I'm trying to figure out. Thanks to @james_w we've been able to make comparisons between this P33 and another known-good P33, and also between my Bolle-adapter and the earlier "tall" type Bolle-adapter that James has.   The SE/30 runs with the P33 inserted, but it locks solid when you try to open the Power Central control panel in the Finder. Loading Power Central at boot also locks the machine if and only if the P33 cache is enabled. (To test this I would remove the P33, change the settings, and reboot with P33 inserted again.) Other symptoms are that the floppy drive (including Floppy Emu) doesn't work with the P33 inserted (shows "disk unreadable"), and that a Radius Color Pivot card in the passthrough slot doesn't work, although it works fine without the P33 and Bolle-adapter.   I spent a lot of hours with MacsBug and eventually traced the freeze down to an instruction which reads memory address $52070000. I can open a debugger, type DM 5207000 and it locks. This address appears to be some kind of register on the P33 card. Other addresses accessed in the Power Central control panel include $520F0000, $52050000 and $52040000. None of these lock the system.   James's known-good P33 does not exhibit this lockup problem, so there's clearly a problem with the card (maybe faulty cache RAM?). But here's where it gets weird:   If we put the bad P33 in his Bolle-adapter, the floppy works and the Radius card works.    If we put the good P33 in my Bolle-adapter, the floppy works and the Radius card works.   So it's only the combination of my Bolle-adapter and the bad P33 that produces the other symptoms. Any ideas what might be different between models of this board? Any other thoughts on what to look at on the P33?  
    • My understanding is that on the Mac OS, Apple never took advantage of the IOPs in the IIfx, and just put them in pass-through mode so that operations to the 53C80 and 85C30 were just like on any other macintosh, except that the signals happened to pass through those microcontrollers.   Reportedly, A/UX did make use of the IOPs.   Does the Mac OS make use of the IOPs on the Q900/Q950?      Were they some kind of 7805 variant?
×