Tandy 1000 SL Technical Reference Manual page 242

3.2.1 m a l Travel: 0.150",
+/-
0 . 0 2 0 ' ' (3.8, +/-0.5m)
3 . 2 . 2 FDRCE:
oz) operating force. This
is
acconplished using both
a
rubber
keyswitch rmnbrane and springs.
A l l
keyswitches s h a l l u t i l i z e
a 2 . 0
ounce
(+/-
0 . 9
3 . 2 . 3 RREAKOVEB EEEDBACK:
feedback t o
assure
t h e
operator t h a t t h e key has been f u l l y
pressed
.
The keyswitches u t i l i z e
a tactile
4.0
FUNCTIONAL REQUIREMENTS
4.1
W E S
The
keyboard generates
a
unique
Hex scan code d r
each keyswitch
t h a t
is
pressed (mike code) and
released (break code). For t h e
AT
M e ,
t h e break code
is
t h e saxe
as
the make code preceded by
" F ' " '
Hex.
Exarrple:
The
m a k e code for the
"ESC" key
is 76
Hex
and t h e break code
is t w o bytes,
F O 76 Hex.
For the X T M o d e ,
t h e break code
is 80 Hex, plus
t h e make code.
Exarrple:
code f o r t h e llESC1l
key
is
01
Hex
and t h e break code
is
81
Hex.
The
k e y s w i t c h - t o - s c a n d e
(make and break codes) assignmnts,
Standard
ASCII
Codes, and m e n d e d ASCII Codes
are
listed on t h e
follawing pages.
The m a k e
3