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  1. Y

    SE/30 Simms

    FYI, I think II, IIx, IIcx, SE/30 all use 120ns or faster SIMMs.
  2. Y

    Reliable source for L88M m68040 CPUs?

    Rochester Electronics has some inventory, sadly expensive: https://www.rocelec.com/parts/details/?part=56b29c5fe4b06adcbe2cd3c3&build=0 K63H mask don't seems to be much different from what I read anyway.
  3. Y

    Reliable source for L88M m68040 CPUs?

    Sadly Freescale just EOLed the MC68040 (I wonder if anyone stocked up before the EOL): http://cache.freescale.com/files/shared/doc/pcn/PCN15939.htm
  4. Y

    Attempt to break the 10MB limit on the Classic II

    I think that is exactly what the original Mac LC does. LC II I think switched to using the PMMU hardware inside the 68030.
  5. Y

    Attempt to break the 10MB limit on the Classic II

    Color Classic is basically another variant of the LC/LC II logic board design I think. I think the reason why a LC III based logic board design for the Classic II case was never done was that the mono 512x342 display was getting obsolete.
  6. Y

    128k Mac Won't "Shut Down"

    FYI, I think it was System 4.0 that introduced the Shutdown Manager. Anything older just ejects the floppies and reboot.
  7. Y

    Is there a 68K mac With PDS and NUBUS slots??

    Yea, I don't think there are any Macs with both LC PDS and NuBus slots.
  8. Y

    Macintosh IIx RAM configuration issues

    16MB PAL SIMMs would be easy to make in the same way as 4MB PAL SIMMs. BTW, the PMMU is required because of how MODE32 maps bank B using it to workaround problems in the original Mac II ROM which would normally limit the RAM to 8MB. The Mac IIx ROMs that also ships with the FDHD upgrade fixes...
  9. Y

    Using an HD20 with a 128k Mac

    Not a thing unless you are running Switcher/MultiFinder
  10. Y

    OS 7 End Date - 2020

    Mac OS itself don't use time_t I think, but other programs may.
  11. Y

    OS 7 End Date - 2020

    I think this is just for the Date/Time control panel, you can use another program to set the date and it will work fine.
  12. Y

    Macintosh IIx RAM configuration issues

    Yea, there is a reason why DRAM capacity quadrupled when Mostek style DRAM was more common and only doubled after SDRAM replaced it. In fact, I don't think having different number of row and column bits caught on until DIMMs with the x8 chips needed it.
  13. Y

    Sanity Check (putting 4MB SIMMs in a Mac II)

    Actually, I think what is happening is that the Mac II ROMs had bugs with more than 8MB of RAM that made such configs unbootable. The Mac II memory controller normally required the address space for Bank A to be larger than Bank B. MODE32 worked around by using PMMU to remap it as mentioned...
  14. Y

    Greenish tinted screen Macintosh Centris 650

    Yea, try changing the DIP switches.
  15. Y

    Greenish tinted screen Macintosh Centris 650

    I think this is called sync on green. I think the "Basic Color Monitor" extension was intended to correct this when a VGA monitor code is detected, which is included in later system versions. Which VGA adapter are you using?
  16. Y

    Trying to identify some old RAM...

    I think probably because the PAL adds delay which the 386 tolerate but the 486 won't.
  17. Y

    OpenStep 68k?

    To be honest, the IIfx did have dedicated IOPs on some hardware including the floppy, but only the IIfx obviously.
  18. Y

    OpenStep 68k?

    Any particular reason why? What about the IIfx for example?
  19. Y

    OpenStep 68k?

    I wonder what would have happened if Apple acquired NeXT years earlier, in say 1993 or so.
  20. Y

    Sanity Check (putting 4MB SIMMs in a Mac II)

    The custom PCBs should not be difficult to make, hopefully with a modern GAL. All that is needed is to force WE high during a CAS before RAS refresh cycle. BTW, what is happening is that normally the larger SIMMs are put in bank A because of the way the Mac II memory controller is designed...
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