Rom Calls And Speller Information; Rom Calls - Tandy WP-2 Service Manual

D.
ROM
CALLS
AND
SPELLER
INFORMATION
1.
ROM
CALLS
CHARSENSE
=
Check
keyboard buffer
ENTRY: 0100H
ENTER:
Nothing
EXIT: Zero
flag set
=
no
key
Zero
flag reset
=
key
exists
H
=
character
code
L
=
control key
status
bit 0:
F2
bit
1:
Fl
bit 2:
Ctrl
bit 3:
Shift (right)
bit 4:
Shift
(left)
bit 5:
Caps Lock
OFF/ON
bit
7,6
0,x:
normal
mode
1,0:
GRPH
mode
1,1:
CODE
mode
Carry
flag set
=
ASCI
I
character
Carry Hag
reset
= CODE
or
GRAPH CHARACTER
REGISTERS
PRESERVED
BCDE.IX.IY
AF\BC\DE',HL'
CHAROET
=
Get one
character
(wait for
input
if
none
in
key-buffer)
ENTRY:
0103H
ENTER:
Nothing
EXIT: Zero
flag set
=
no key
Zero
flag reset
=
key
exists
H =
character code
L
=
control key status
bit 0:
F2
bit
1:
Fl
bit 2:
Ctrl
bit
3;
Shift (right)
bit 4: Shift (left)
bit 5:
Caps Lock
OFF/ON
bit
7.6
0,x:
normal
mode
1,0:
GRPH
mode
1,1:
CODE
mode
Carry
flag set
=
ASCII
character
Carry
flag reset
=
CODE
or
GRAPH CHARACTER
REGISTERS
PRESERVED
BC.DE,IX,IY
AF.BCDE'.HL'
KILLBUF
=
Kill
key
buffer
ENTRY:
0106H
ENTER:
Nothing
EXIT:
Nothing
REGISTERS
PRESERVED
BC,DE,IX,IY
AF\BC\DE\HL'
D-l