ZiLOG System 8000 User Manual

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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 ~
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ZiLOG System 8000 Specifications

General

Brand	ZiLOG
Model	System 8000
Category	Desktop
Language	English