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IBM Portable PC
November 20th, 2013, 12:40 AM
I have a Compaticard IV issue and I'm trying to see if specifying a drives geometry will help.

According to: http://www.4dos.info/tools/undoc_dos.txt

"DRIVPARM (CONFIG.SYS only) Documented in DOS 4.0 through
6.x; undocumented in DOS 3.2, 3.3, PC DOS 7, and
PC DOS 2000. Works fine in MS-DOS 3.2/3.3 and PC
DOS 7.0/2000, but requires special handling in PC
DOS 3.2 or 3.3; see end of file.
In PC DOS 3.2 and 3.3

When using PC DOS 3.2 or 3.3, DRIVPARM is undocumented but it can be
made to work using this trick. In CONFIG.SYS, type:

Normal DOS 4.0+ DRIVPARM set-up switches.
\/
DRIVPARM ^A^A^A {switches}
/\
Type Ctrl-A, not Shift-6 A. In MS-DOS's Edit, type Ctrl-P
then Ctrl-A (you will see a smiley face on the screen)."

Apparantly it's actually DRIVPARM=:):):):)={switches}

I've tried the above and PCDOS 7 reports "unrecognized command" in config.sys?

Also I believe the FDD must be supported in BIOS first, will the CC4 BIOS count?

Chuck(G)
November 20th, 2013, 09:14 AM
DRIVPARM doesn't do anything magical--it just sets up a BPB for a device. The BIOS still must support the desired mode.