DOS ain't dead

lDebug release 8 (Announce)

posted by Japheth , Germany (South), 11.03.2024, 10:47

> Both dosemu2 and HDPMI appear to set the ss B bit but leave esph as zero.

Yes. Win9x has problems with hiword(esp) of 16-bit stacks trashed in ring0 - I definitely wanted to avoid that, although the ring0 ss segment in hdpmi needs access to both dos memory and host memory ( which is > 0xff800000 ).

It was fixed by mapping the few needed conv. memory pages into the host address space; that "double" mapping causes a measurable speed penalty, btw.

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MS-DOS forever!

Complete thread:

• lDebug release 8 - ecm, 08.03.2024, 19:29 (Announce)
  • lDebug release 8 - Japheth, 10.03.2024, 10:40
    • lDebug release 8 - roytam, 10.03.2024, 11:53
    • lDebug release 8 - ecm, 10.03.2024, 15:02
      • lDebug release 8 - ecm, 10.03.2024, 15:25
        • lDebug release 8 - Japheth, 11.03.2024, 10:47
    • lDebug release 8 - ecm, 11.03.2024, 09:30