Winchester Disk Drive; Cartridge Tape Drive - ZiLOG System 8000 User Manual
Zeus operating system manual
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Also See for System 8000:
- Hardware reference manual (366 pages) ,
- Hardware reference manual (100 pages)
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USER
12
Zilog .
USER
2.2.2
Winchester Disk Drive
The hard disk subsystem consists of a 24-megabyte eight-inch
Winchester
disk
drive
that interfaces with an intelligent
ZaOB-based disk controller.
A formatted disk is capable
of
retaining up to 22 megabytes of user process data.
The Winchester disk drive, which is housed in the peripheral
module
(Figure 2-2), provides rapid access to the ZEUS file
'system which is used for program development.
2.2.3
Cartridge Tape Drive
The cartridge tape drive can be used for
loading
the
ZEUS
Operating
System,
selective file storage, high speed pro-
gram and data file back-up to the Winchester disk drive, and
for executing standalone system diagnostics.
The control of
the tape drive is provided by a
ZaOB-based
cartridge
tape
controller,
located
in
the
processor module.
Up to 17.2
megabytes of unformatted data or 14 megabytes
of
formatted
data can be stored on a 450-foot tape.
2.2.4
ADM-31 Data Display Terminal
The optional data display terminal is the
primary
bidirec-
tional
data interface between the user and the system.
The
display screen is a 12-inch diagonal
CRT
with
a
graphics
matrix
of
80
characters
per
line
by 24 lines.
All 128
printable ASCII characters can be displayed on the screen.
The terminal keyboard (Figure 2-3) is similar to that
of
a
standard
typewriter
with
the
addition of special-purpose
keys (Figure 2-4) to facilitate command execution.
The fol-
lowing
paragraphs
describe
the
function
of the special-
purpose keys:
Return~.
Commands are read by the ZEUS Operating
System
character-by-character
as they are entered.
The command is
executed only after
the
return
key,
labeled
RETURN,
is
pressed.
Control~.
The control key, labeled CTRL,
generates
and
sends
control
instructions
to the terminal during command
execution.
Any character that is typed with
the
CTRL
key
pressed is transparent to the user, but is recognized by the
CPU.
For example, to slow, down
or
temporarily
interrupt
data
transmission to the terminal without permanently halt-
ing execution
of a command,
enter
control-~
by
typing
~
Zilog
12
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