ZiLOG System 8000 Hardware Reference Manual

HRM 21 Zilog
HRM 21
/ UNIT / Unit is written to the controller through CP1. Any
value between zero and three is valid.
B.11~ Format Read I UNIT / HEAD / CYLINDER / / SECTOR /
ADDRESS I
When the Format Read command is issued, the host diagnostics
can read an entire sector, both sector header information
and data.
/ UNIT / Unit is written to the controller through CP1. Any
value between zero and three is valid.
/ HEAD / Head is written to the controller through CP2.
/
CYLINDER / The target cylinder number is written to the
controller through command ports CP3 and CP4. The low order
eight bits of the ten bit cylinder address are issued to the
controller through CP3 and the high order two bits are
issued through CP4 bits zero and one.
I SECTOR / The sector number of the sector to be read is
sent to the controller through the sector register, CP5.
I ADDRESS / The 24-bit address of the host data buffer is
pas s e'd tot he con t roll e r t hr 0 ugh are gi s t e r t rip 1 e t; CP10 ,
CP11, and CP12.
B.12. Set Interrupt Aqdress. / SECTOR I
The Set Interrupt Address allows the host system to speciry
the low order eight bits of the address for interrupt
transfer. That.address and an eight-bit Operation Ending
Status byte are sent to the address bus lines when the con-
troller issues an interrupt. Typically, the Set Interrupt
Address command is issued once shortly after the controller
is powered up.
I SECTOR I The sector number of the sector to be read is
sent to the controller through the sector register, CP5.
B .. 13. Self Test
This command forces the controller to execute its self diag-
nostics. Both the command reject and the command accepted:
bits are set in the command status byte if a self test error
is detected. It is possible that the self test error will
preclude the setting of the bits in the command status byte.
B-5
Zilog
B-5

ZiLOG System 8000 Specifications

General

Brand	ZiLOG
Model	System 8000
Category	Desktop
Language	English