The go-to place for all IBM PS/2 and Micro Channel enthusiasts
VX FT MkI BIOS Revision Summary
Information sourced from Mitsubishi Electric's Insight CD page (rev. 1.1.11).
|ABIOS request block sizes corrected,
serial size was too small and could have caused errors with ABIOS CMOS status check
routines corrected to return valid battery state.
|Screen now cleared on VX FT Server
before security box displayed. Pointing device presence bit now correctly set - was being
set id CMOS bit set, now only set if actually present. Corrects problems with Windows.
Qi 300 build now uses CR0 to get out of protected mode, this cures the ACAD cursor problem
as port 92 method causes reset of the 387 as well.
Qi 600/VX FT now uses switch 6 to specify whether paging is enabled or disabled in memory
config. Cures lots of UNIX/XENIX problems with parity errors.
|VX FT - Cache enable bits inverted to
comply with B3 stepping of the 486.
|Changed sync polarities for dual sync
Sony to both positive and also changed horizontal sync position to move the picture to
centre of screen. Added the code for second processor start-up in VX FT models. Added
Imprimis 66.5MB drive as type 40. Removed RLL Toshiba. Added dual boot facility added to
all MCA machines. This is mainly to cater for Western Digital Ethernet remote boot. Init.
128 bits of memory before we read it, this stops NMI parity errors on 486 hypercache
systems. Hypertec memory board in particular.
|Corrected dual processor start-up for
Deleted VX FT checking on keycard logon time-out on machines other than VX FT.
|IBM SCSI - Moved Apricot extended CMOS
information from 0500 to 0300H, and changed ABIOS DMA table entry from 0FFFF to 00005H.
OS/2 Remote Access Service - implemented new 'SERIAL.ASM' from Phoenix.
OS/2 'Mad' or, as IBM refer to it, 'Wild' mouse - include an extra call to 'wfibe' (Wait
for input buffer empty) in 'KEYBRD.ASM'.
Relocated Petrel / ESDI BIOS from 0E000:08000H to 0E000:0C000H to make room for a larger