DOS ain't dead

UIDE etc. (July 22) (Announce)

posted by Rugxulo , Usono, 25.07.2011, 21:26

Johnson Lam has posted a new 7-22-2011 DRIVERS.ZIP file
on his website at:

http://johnson.tmfc.net/dos/driver.html

In it, UIDE and UIDE-S now have a /E "emulator" switch,
for use with VirtualBox. /E makes both drivers "call
the BIOS" on hard disk I-O requests. This permits the
drivers to go-around most of their hard-disk init logic
and prevents VirtualBox trouble (it may not emulate ATA
Identify-Device commands and EDD-BIOS calls correctly).

Users who had been running UIDE /N1 (no hard-disks), to
avoid VirtualBox problems, can now try UIDE /E instead.
/N1 causes UIDE to totally ignore all hard-disks, while
/E does permit hard-disk data to get cached, after UIDE
"calls the BIOS" to do disk I-O. This is much better!

Note that "calling the BIOS" may cause a BIG speed loss
if using JEMM386 or other protected-mode setups. Many
cheap BIOS programs omit DOS "Virtual DMA" support, and
in protected-mode they can only do SLOW "PIO mode" data
transfers! VirtualBox users who use UIDE /E shouldn't
enable protected-mode, if possible, to avoid such hard-
disk speed losses.

Complete thread:

• UIDE etc. (July 22) - Rugxulo, 25.07.2011, 21:26
  • UIDE+jemm+VCPI - david, 28.07.2011, 13:34
    • UIDE+jemm+VCPI - Rugxulo, 28.07.2011, 22:38
  • FYI: DEATH (of Jack) - DOS386, 29.07.2011, 09:20
    • FYI: Jack still alive - Japheth, 30.07.2011, 07:57
      • FYI: Jack still alive - DOS386, 30.07.2011, 16:12
    • BORLAND DPMI-16bit - david, 31.07.2011, 18:31
      • BORLAND DPMI-16bit - Japheth, 31.07.2011, 21:09
        • BORLAND DPMI-16bit - david, 02.08.2011, 17:10
          • BORLAND DPMI-16bit - Rugxulo, 13.08.2011, 01:35
            • BORLAND DPMI-16bit - bretjohn, 13.08.2011, 17:30
              • BORLAND DPMI-16bit - Rugxulo, 14.08.2011, 00:13
                • BORLAND DPMI-16bit - Laaca, 14.08.2011, 12:07
                  • BORLAND DPMI-16bit - Khusraw, 14.08.2011, 18:04
                    • BORLAND DPMI-16bit - Rugxulo, 14.08.2011, 18:36
                    • BORLAND DPMI-16bit - Laaca, 16.08.2011, 22:24
                • BORLAND DPMI-16bit - bretjohn, 14.08.2011, 18:48
          • BORLAND DPMI-16bit - a workaround for this issue - Japheth, 15.08.2011, 16:29
            • BORLAND DPMI-16bit - a workaround for this issue - Rugxulo, 15.08.2011, 22:29
              • BORLAND DPMI-16bit - a workaround for this issue - Japheth, 16.08.2011, 03:37
              • BORLAND DPMI-16bit - a workaround for this issue - Rugxulo, 16.08.2011, 07:51