ZiLOG System 8000 Hardware Reference Manual

HRM Zilog
HRM
READ LONG causes sectors to be read along with their ECCs,
which are appended to the end of each data block. Provided
for diagnostic purposes to test error correction, the host
writes a sector with a normal WRITE, reads it back with READ
LONG, induces an error by switching one or more bits, writes
the erroneous buffer with WRITE LONG, and then reads the
sector with a normal READ command.
READ causes the specified sector(s) to be read and
transferred to host memory. If necessary and not suppressed,
error correction and retry procedures are invoked.
SIZE DISK causes the controller to examine the specified
drive and return in the packet cylinder, head and sector
words, the number of cylinders, heads, and sectors on the
drive. The controller finds the size by scanning the IDs
and looking for end-of-track, cylinder, and pack ID flags.
This command takes several seconds. If the controller scans
past cylinder 4096 without finding an end-of-pack bit, a
pack overflow error is declared.
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Zilog
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ZiLOG System 8000 Specifications

General

Brand	ZiLOG
Model	System 8000
Category	Desktop
Language	English