MODEL II OPERATION
Keyboard
The
ModelIIKeyboard has its ownLSI controllertofree the Z-80A processor
from keyboard scan and related tasks.
The
Keyboard
is
in a separatecase and
is connectedto
the
DisplayConsolevia a built-in cable at the bottomfront
of
the
Console.
The
Model II has the standard typewriter keys (letters, numbers and
punctuation symbols); however, each
ofthese
keys can output several
different codes to the Computer, depending on which mode the Keyboard
is
in: Unshift, Shift, Caps,
or
Control. In addition, the Keyboard features a
Repeat
key
and
two programmable "function" keys. (See Keyboard
Operation.)
Floppy Disk Drive
The
Model II includes a built-in
8"
disk drive.
Up
to 3 more drives can be
added
in
an
externalExpansion Unit. (See Section6, Add-Oos.) Because
of
a
special high-density recording technique, each diskette can contain 509,184
bytes
of
information, which
is
more than 5 times the capacity
of
a 5-1/4"
diskette.
(It
would take a
70
wpm typist24 hours
of
typing at speed to
fill
an
8"
diskette.)
Note:
Actual
space available to user
is
determined by the Operating System.
The
"System Drive" (the one that's built-in) must always contain an Operating
System diskette.
The
other
optional drives can de devoted exclusively to the
storage
of
user programs and data. (See the Disk Operating System Manual
for actual diskette space allocation.)
Peripheral Interfaces
There
are four interface connections on the back
of
the Display Console:
• Two serial (RS-232-C) Input/Output (I/O) channels
• A parallel
I/O
channel, e.g., for connection to TRS-80 standard
parallel-interface line printers
• Floppy-disk
I/O
channelfor connection
of
theModel II Disk Expansion
Unit
The
DisplayConsolealso providesconnectors and slots for future expansion.
(See Section 6,
Add-Oos.)
6
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