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Recent content by yuhong

  1. Y

    IBM PC's 8088 replaced with a Motorola 68000

    For example, the difference between MC68000G8 and MC68010P8.
  2. Y

    IBM PC's 8088 replaced with a Motorola 68000

    I am talking about the difference between the "G" and the "P" packaging for example.
  3. Y

    IBM PC's 8088 replaced with a Motorola 68000

    Nope, I don't think this is true. You can see this in the different package types.
  4. Y

    IBM PC's 8088 replaced with a Motorola 68000

    I mean that it was based on a die shrink, which is why it took so long.
  5. Y

    IBM PC's 8088 replaced with a Motorola 68000

    http://www.easy68k.com/paulrsm/dg/dg17.htm "As a result, work on a faster (shrunk) 68000 has been set aside and all hands are concentrating their efforts on the 68010. We understand that the 68010 will be the chip targeted for speed improvement. The good news is that the 68010 is pin compatible...
  6. Y

    Discovered RTC bug in PC DOS 2000 / IBM DOS 7

    I wonder if this change was to avoid partial register stalls on the AH register.
  7. Y

    720kB and 1.44MB drive compatibility riddle with 720kB floppy disks

    I am talking about HD floppies. Edit: Though this is a good time to mention that cobalt is probably far common than barium, but...
  8. Y

    What was the first PC BIOS that copied itself from ROM into RAM?

    I doubt HIMEM had an option to shadow ROM into RAM. EMM386 might have though.
  9. Y

    Did anyone release software, updates of patches commercially on 2.88MB floppy?

    I wonder if the fact that it was based on barium ferrite made them unattractive to software companies.
  10. Y

    640x400 256 color mode on standard VGA

    Actually, I wonder if the pixel clock is actually halved or if the pixels are just doubled.
  11. Y

    640x400 256 color mode on standard VGA

    Interestingly http://bitsavers.trailing-edge.com/components/chipsAndTech/82C452_Super_VGA_Graphics_Controller_199109.pdf : "The maximum display bandwidth is 200 MBits/s - 25 MB/s at 8 bits/pixel" I wonder if this required faster DRAM chips for example.
  12. Y

    Reviving an IBM CGA Card

    I know, but there was almost certainly plenty of alternatives by 1985.
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