Tandy 1000
KEYBOARD ASSEMBLY
Technical Reference Manual
The Tandy 1000 has a 90-key keyboard that includes
12
function
keys,
a
numeric keypad, and special purpose keys for paging. The keyboard
is
con-
nected
to
the Main Unit by a coiled cable and operated
at
a maximum distance
of
4 feet from the main unit. Figure 23 shows the interconnecting cable con-
nector to the keyboard assembly. The cable assembly can be disconnected
from the keyboard assembly during repair.
JI
I
DATA
2
RESET
TO
MICRO
PROCE"SSOR
3
CLOCK
4
BUSY
t5
VCC
GND
Keyboard
Assembly
Connector
Figure
23
Keyboard Specifications
The keyboard
is
fully encoded with microprocessor control, and requires + 5
VDC
supplied from the Main Unit.
1.
Key Type -
all
keys generate
"make"
and
"break"
codes.
See
the Key
Code Chart. Break codes are formed by adding
BOH
to the make code.
Keys 49 and
71
have alternate action that
"makes"
on one actuation
of
the key and
"breaks"
on
succeeding actuation. No code
is
generated for
these two keys when the key
is
released.
2.
Number of Keys - 90
3.
Repeat Strobe - there
is
a repeat strobe of
66
to
111
mSec when any key
is
depressed for more than 1 second,
with
the exception of SHIFT, CTRL,
CAPS,
ENTER, and NUMBER LOCK.
101
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