ZiLOG System 8000 Hardware Reference Manual

HRM
Zilog
Table lJ-20 Tape Interrupt Vector, Bit Definitions
HRM
BIT
Bit 8
Bit 9
Bi t 10
Bi t 11
Bi t 12
Bi t 13
Bit 14
B1 t 15
NAME
INTV
BUSY
CMDREJ
DATERR
SKNDNE
OVERFL
FFERR
Not Used
MEANING
The current operation requires
invention.
The controller is busy executing the
last command.
The
controller rejects the current
command.
An uncorrectable data error has
occurred.
The current skip operation has not
been completed.
A buffer overflow has occurred.
A FIFO error has occurred.
Table ~-21 Host-Tape Controller Commands
CODE (HEX)
0000
NAME
NOP
DEFINITION
The
controller loops while waiting' for
a command from the host.
0001
READ
The controller reads
necessary, controller
retries.
one block. If
backspaces and.
0002 'iVRITE
The controller writes one block. If
necessary the controller back-spaces,
erases three inches of tape and retries.
0003
REWIND
Controller rewinds
tape to it
logical
beginning
(6
inches
past
th'e
load
point) .
nn04
SKBF Controller
skips nn blocks forward (nn
is
any value from
0
to 255).
nn05 SKBR
Controller
skips
nn blocks in reverse
(nn=O to 255).
4-50
Zilog
4-50

ZiLOG System 8000 Specifications

General

Brand	ZiLOG
Model	System 8000
Category	Desktop
Language	English