ZiLOG System 8000

HRM Zilog
HRM
DRIVE REGISTER
C:OMMAND REGISTER
RESERVED
RESERVED
RESERVED
TRANSFER WORD
COUNT, BITS 7·0
TRANSFER ADDRESS
BITS
15·8
SECTOR REGISTER
CYLINDER HIGH
REGISTER
RESERVED
CYLINDER LOW
REGISTER
TRANSFER WORD
COUNT, BITS
15·8
HEAD REGISTER
RESERVED
l"RANSFER ADDRESS
BITS 23·16
XXOC
XXOA
XXOB
r - - - -DiSK CoNTROLl:ER - - - - "l
I I
I
I
I
I
I
I
I
L -.l
'--_":"'-_-'\ YRANSFER ADDRESS
BITS 7-0
00177
Figure 4-4 Disk Controller Command and
Command status (CIS) Registers
4-18
Zilog
4-18