Atari ST series - Page 379

The Intelligent Keyboard Controller
$80 Reset
T his co m m a n d p e rfo rm s a sim p le self-test, a n d re tu rn s th e k eyb oard co n 
tro ller to its d efau lt m o d e a n d p a r am e te r s e ttin gs . It d o e s n o t affect th e
clock settin g s.
Input parameters
Byte
Number Description
1 A v alu e o f 1. A n y o th e r v alu e ca u s e s th e re se t co m m an d to be
ig n o red .
IKBD Status Commands
M an y o f th e IK BD se ttin g co m m a n d s h a v e c orre sp o n d in g sta tu s in qu iry
co m m a n d s. T h ese co m m an d s cau se th e IK BD to se nd an in fo rm atio n
p ac k e t th a t tells a b o u t th e c u rr e n t s ettin g , ra th e r th an ch an g in g it. T h eir
co m m a n d n u m b ers are fo rm ed b y a d d in g $ 80 to th e o rigina l se ttin g co m 
m an d n u m b er. T h e retu rn ed re sp o n s e s are d e s ig n ed to im itate th e form a t
o f th e o rig in al se ttin g co m m a n d s, so if th e sta tu s p ack e t h e ad e r b y te ($F 6)
a t th e b eg in n in g is strip p ed a w a y , th e re st o f th e p ack et m ay b e se n t back
to th e IK BD as a co m m an d w h ich re sto re s th e orig in al settin g. A ll sta tu s
rep o rts are p ad d e d to eig h t b y tes in le n gth , b u t th e 0 v alu e th a t is u sed fo r
p a d d in g is ig n o re d b y th e IK BD w h e n se n t a s a co m m a n d . In o r d e r to re 
ceiv e IK BD sta tu s p ack ets o n th e S T , y o u m u s t rep lace th e s tatv ec v e cto r
w ith a ro u tin e o f y o u r o w n th at tra n sfers th e p ack ets to y o u r ow n bu ffer.
A su m m a ry of th e IK BD sta tu s co m m an d s a r e s h o w n b elow .
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