HP 2100 Series User Manual

66
Device options that may be specified are:
Option Action
12557A
Use the 12557A interface and 2870A drives
13210A
Use the 13210A interface and 7900A drives; default
SC=<n>
Set the interface card select codes; default is 22/23
ENABLED
Enable the device; default
DISABLED
Disable the device
The 12557A and 13210A options set the interface type and, by implication, the disc drive type.
When entering the SC option, specify the lower select code with either device name; the higher select code will be
set automatically, and the cards will be assigned in the correct order.
Device configuration may be displayed with the following commands:
Command Action
SHOW DPC
Display the device and unit configuration
SHOW DPC TYPE
Display the interface type
Unit options that may be specified for the individual disc drives are:
Option Action
UNLOAD Set the drive’s Run/Stop switch to Stop; default when detached
LOAD Set the drive’s Run/Stop switch to Run; default when attached
PROTECT Set the drive’s Data Protect switches to On
UNPROTECT Set the drive’s Data Protect switches to Off; default
ENABLED
Enable the unit; default
DISABLED
Disable the unit
The UNLOAD and LOAD options unload and load the drive's heads from the disc pack, setting the drive not-ready
and ready, respectively. UNLOAD provides a convenient method of setting a drive "down" without detaching the
associated disc image file.
The PROTECT option prevents writing to the disc. It is the hardware equivalent of setting the Upper and Lower
Data Protect switches to the On position. The UNPROTECT option permits writing and is equivalent to setting the
switches to Off. Separate protection for the upper and lower platters of the 7900 drive is not supported. Also, the
drive Protect/Override switch is not supported; drive protection is permanently overridden.
The interface supports the BOOT command to load a disc boot extension. The BOOT {–R} DPC command is
equivalent in hardware to setting the S register to select and configure the HP 12992F boot loader ROM, pressing
the IBL button to copy the ROM into memory, and pressing the PRESET and RUN buttons to begin execution. The
S register is set as follows:
1514131211109876543210
0100 DPD select code unchanged 00

If the –R switch is specified, bit 0 is set to 1 to boot from the removable platter. If –R is not specified, then bit 0 is
set to 0 to boot from the fixed platter.
Bits 5-3 of the existing S-register value are retained when the BOOT command is executed and are available to the
boot extension program.

HP 2100 Series Specifications

General

Brand	HP
Model	2100 Series
Category	Switch
Language	English