The Solution: Create a simple starter-disk to open the reference partition.
Restoring System Partition
On most systems you will need 2 or more Diskettes:
To restore System Partition:
Normally the System Partition is hidden and can only be
accessed with the reference disk ("Copy An Option Disk") or by pressing
[CTRL]+[ALT]+[INS] after a reboot, when the cursor jumps to the top right
corner of the screen.
If you often change adapters and often do 'Copy An Option Disk'
it may one day happen, that 'Backup System Partition' ends up with a 'Disk
Full'-error and is aborted before the entire partition is saved to disks.
Accessing System Partition under DOS
You will get the DEBUG 'minus'-prompt
Type the following - all behind the ';' is comment:
D 0 ; display content of sector from adress 0 on
E 8 ; edit byte 08h
- E XX 20 ; content of 08h is displayed, enter only the 20 !
; press [SPACE]
XX 33 ; content of 09h is displayed, enter only the 33 !
; press [SPACE]
XX 79 ; content of 0Ah is displayed, enter only the 79 !
; press [ENTER]
D 0 ; display the content again: 3y must appear at 09h and 0Ah
W 0,0,0,1 ; write the sector back to drive A:
Q ; quit DEBUG
You're back at the DOS-prompt
Do Not perform a DIR-command or Explorer-View on this Disk from Win95 !Win95 overwrites the header and all modifications just made are changed again.
You are now on your System Partition. Attention: Watch out not to delete files the system will need later on !
You may -of course- delete ADFs and corresponding ADPs from cards which are no longer installed in the system. Download my QBMCA software to find out which one are already installed.
@xxxx.ADF are the Adapter Desription Files (ADF) ASCII-files and can be viewed and edited.
@xxxx.DGS are Diagnostic Files for the corresponding Adapter
Dxxxx.ADF are Planar Description Files for the Systemboard
Basically: Leave all DGS-files untouched unless they can be definitely assigned to a card which is no longer in the system. Same recommendation to all Planar Files. Some may be deleted of course, because they belong to other machines, but it is hard to tell which ones. You may find out, which Planar your machine uses with QCONFIG from PC-DOS 6.3 or later. Run it with the Option /D /O and edit the File QCONFIG.OUT. The Planar ID is given somewhere in this text.