DOS ain't dead

UIDE etc. (Oct. 7) (Announce)

posted by Rugxulo , Usono, 13.10.2011, 22:02

> Johnson Lam has posted an updated 7-Oct-2011 DRIVERS.ZIP file on
> his website, at http://johnson.tmfc.net/dos/driver.html . The
> site still has a "Last Update" date of 9-30, but the files which
> download ARE dated 10-07-2011 and have been verified O.K.
>
> This update is not more driver improvements but fixes a "BUG" in
> some of the "EDD BIOS" logic being used today!
>
> Daniel Nice noted that on 3 of his 5 systems, a USB memory stick
> declared to the BIOS as a "hard disk" caused the UIDE drivers to
> "duplicate" his last actual hard disk! He found the "EDD BIOS"
> is NOT updating the "DPTE" pointer for a "USB stick" disk -- The
> BIOS declares 30 bytes of EDD data, but in fact returns only 26,
> leaving the last actual hard-disk's "DPTE" pointer still there!!
> This is clearly an ERROR in the BIOS, that needs to be CORRECTED
> by those ["children", usually!] who create BIOS programs!
>
> Daniel suggested a "workaround" of setting the "DPTE" pointer to
> all-ones before UIDE issues Int 13h AH=048h. That worked fine!
> The UIDE drivers can again handle all "real" SATA/IDE hard disks
> without getting confused when USB-stick "disks" are also in use.
>
> Users should upgrade immediately to the 7-Oct-2011 UIDE drivers,
> if (A) their system BIOS lets "USB memory sticks" be declared as
> "hard disks" and (B) their system also has one or more REAL hard
> disks attached!
>
> Many Thanks to Daniel, who in fact did all my "Leg Work!" in his
> analysis and resolution of this Bad BIOS "BUG"!

Complete thread:

• UIDE etc. (Sep. 23) - Rugxulo, 25.09.2011, 03:40
  • UIDE etc. (Sep. 30) - Rugxulo, 04.10.2011, 15:49
    • UIDE etc. (Oct. 7) - Rugxulo, 13.10.2011, 22:02
      • UIDE etc. (Oct. 16) - Rugxulo, 16.10.2011, 20:44