Tandy 1000 SL Technical Reference Manual page 255

The
following ccmnmds may
be
s e n t t o
t h e keyboard
a t any t i n e ,
follaving t h e protocol
described for t h e
AT
M e .
These
caminan&
are valid only i n
the
AT
M e . During the reset
ccnrpnand,
the
keyboard w i l l not respond within 20 microseconds as described
above
.
Upon receiving t h i s carmand,
t h e
keyboard transmits an
Acknowledge t o t h e host
system. The
keyboard then waits f o r t h e
host system t o accept
t h e
Acknuwledge response.
T h e
host system
w i l l accept t h e Acknuwledge by r a i s i n g t h e clock and data l i n e s
f o r a mininun
of 500
microseconds.
The
keyboard then executes the s e l f test routine similar to t h e
Pckler-a~ R e s e t ,
and is placed i n its d e f a u l t state.
Upon receiving
this
carmand, t h e keyboard w i l l t r a n s n i t t h e last
byte
of data s e n t t o t h e host
system.
SEX' DEFAULT
-
F6
Hex
This camand resets
the
keyboard t o t h e Paver-Up d e f a u l t state.
The
keyboard responds with an Acknowledge, clears t h e output
buffer, sets t h e scanset t o A T Mule, sets t h e d e f a u l t typenatic
rate and delay, and continues to scan t h e matrix.
DEFAULT DISABLE:
-
F5 Hex
T h i s
ccpnmand
is similar to the
Set
Default comnand, except
t h e
keyboard stops
scanning
the
matrix and w a i t s f o r
f u r t h e r
i n s t r u c t i o n s t o
be
s e n t by t h e
host system.
ENABLE
-
F4 Hex
Upon receipt of
this
ccnrmand
the
keyboard responds with an
Acknowledge,
clears
t h e
output buffer, and starts scanning
t h e
matrix.
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