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Section 4 - Chapter 4
4.3The System Disk Driver
Depending on what type of drive your subsystem drive is, you may or may not have to
generate a new driver program in order to convert it to a System Disk. The sections
below discuss the types of disks and what you need to do.
4.3.1Non-self-configuring Disks
If your subsystem disk is a non-self-configuring disk, you need to use FIX420 to
generate a new driver program. See your System Commands Reference Manual for
information on FIX420. Remember to write down the bitmap size, so you can
define the bitmap for the device in your system initialization command file later.
4.3.2Self-configuring Disks
If your subsystem disk is a self-configuring disk, you do not need to generate a driver
program for it.
When your self-configuring disk was defined as a subsystem, FIXLOG
was used to configure a sub-system driver for the device. It is important
to remember to use the generic driver for the disk (i.e., if it’s AM-520
controlled, use 520DVR.DVR). DO NOT use the sub-system driver!
4.4Disks that Use the Same Driver
Some computer systems have more than one SCSI type of self-configuring disk of the
same size. These drives use the same driver program, and the only difference between
the System Disk and subsystem disks is how they are connected in the hardware.
With this type of system, changing a disk from a sub-system disk to a System Disk is
done by changing the device ID jumper on the controller board (or CPU board, if the
disks are connnected to the CPU), copying the system software to the new System
Disk, generating a new monitor and changing your initialization file.
4.5Generating a New Monitor
Log into DSK0:[1,4] on the new device and create a new monitor using the MONGEN
program—see Section 4 - Chapter 3.
When MONGEN asks you for the driver name, enter the driver for the device for which
you are building the System Disk. This defines your new device to AMOS as the
System Disk. Remember not to name your new monitor with the name of your system
monitor—choose a name like TEST.MON. After you run MONGEN, save the new
monitor. Do NOT reboot your system at this point.
System Operator’s Guide, Rev. 02