ZiLOG System 8000 Hardware Reference Manual

HRM
Zilog
HRM
POSITION - For diagnostic purposes, a seek is performed to
the specified cylinder. If CY is -1 a rezero and reset-fault
rather than seek occurs.
WRITE FORMAT initializes the ID and data fields of one or
more sectors in a track. The host prepares the IDS contigu-
ously in a buffer, four words per sector. CT is set to the
number of sectors to be formatted; SC specifies the starting
sector. Sector numbers may be arranged as desired. One or
more sectors may be flagged as bad or as spare.
The sector IDs buffer prepared by the host contains the fol-
lowing 4 words for each sector to be formatted:
15 14 13 12 11 10 9 8 7 6 5 4 3 2 0
\ET1EC\EP\
CYLINDER
HEAD
lFLISPl
SECTOR
ID:ET
flags last sector
on
a track
ID:EC
Flags last sector
on
a cylinder
ID:EP
flags last sector
on
a pack
ID:FL
flags
a
sector" as
bad
ID:SP
flags a sector
as a
spare
WRITE" causes data to be written to a specific location on a
specified drive. If a partial sector is written with WRITE
or WRITE LONG, the contents of the remainder of the sector
are undefined.
WRITE LONG is similar to WRITE except that the data ECC
field is written from the four bytes following the data
instead of being internally computed. This command is pro-
vided for diagnostic purposes.
READ FORMAT is the inverse of WRITE FORMAT, except that the
ID EGG is read along with each ID. Six words are returned
for each sector specified. Sectors are read in physical
order starting with the sector specified by SG. ID contents
are passed directly without error checking.
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Zilog
4-34

ZiLOG System 8000 Specifications

General

Brand	ZiLOG
Model	System 8000
Category	Desktop
Language	English