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5.2.1
OPTIONAL LINES FOR HARD-SECTORED AND REMOVABLE DRIVES
Hard-sectored and
removable drives
require
some additional
signals across the drive interface.
These are supported by the
ACB-5500 when indicated by the proper board jumper condiguration
and MODE SELECT command (ISH).
The
hard
sector
drive
interface
requires
a
signal
line
to
transmit sector pulses to the ACB-5500 for proper data transfers.
This line is assigned to pin 16 of connectors J2 through J5.
Installing jumpers E-F and/or G-H will cause the ACB-5500 to use
this signal.
Removable drives provide two additional lines for monitoring the
status of the removable cartridge.
These are Change Cartridge,
signaling the drive to spin down,
and Cartridge Changed,
signal ing the controller the cartridge has been changed.
These
lines are assigned to pin 2 of Jl and pin 9 of J2 through J5
respectively.
The ACB-5500 reports a changed cartridge with the
next disk access through a Cartridge Changed (28 H ) error code.
write project is also used by removable drives
to signal a
protected cartridge.
This
line
is assigned to pin 5 of
connectors J2 through J5.
The ACB-5500 reports a write protect
violation through a Write Protect Violation (27
H )
error code.
A more detailed description of these signals can be obtained from
the disk driver OEM manual.
5.3
DISK FORMAT
The ACB-5500 disk format is based on the standard ST 506 format
and
is compatible with the ACB-4000 controller.
Table 5-3
details the ACB-5500 disk format for soft-sectored drives.
Table
5-4 details the disk format for hard-sectored drives.
500504-00
5-6
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