Radio Shack TRS-80 Model III - Page 92

TRS-80
MODEL
III
Summary
of
Important
ROM
Addresses
Address
Contents
Function
Dec
Hex
0000 $RESET
System reset
43
002B
$KBCHAR
Check
for
keyboard
character
51
0033
$VDCHAR
Display
a character
59
003B
$PRCHAR
Print
a
character
64
0040
$KBLINE
Wait for
a keyboard
line
73
0049
$KBWAIT
Wait
for
a keyboard
character
80
0050
$RSRCV
Receive
character
from
RS-232-C
85
0055
$RSTX
Transmit
character
to
RS-232-C
90
005A
$RSINIT
Initialize
RS-232-C
96
0060
$DELAY
Delay
for
a specified
time
105
0069
$INITIO
Initialize all
I/O drivers
108
006C
$ROUTE
Route
I/O
457
01 C9
$VDCLS
Clear
the screen
473
01
D9
$PRSCN
Print
screen
contents
504
01
F8 $CSOFF
Turn off cassette
539
021
B
$VDLINE
Display
a
line
565
0235
$CSIN
Input
a cassette
byte
612
0264
$CSOUT
Output
a cassette
byte
647
0287
$CSHWR
Write the
cassette header
653
028 D
$KBBRK
Check
for
(BREAK) key only
662
0296
$CSHIN
Read
the cassette
header
664
0298
$CLKON
Turn on the
clock
display
673
02A1
$CLKOFF
Turn
off the clock
display
6681
1A19
$READY
Jump
to
BASIC
"Ready"
12339
3033
$DATE
Get the
date
12342
3036
$TIME
Get the
time
12354
3042
I
$SETCAS
Set cassette
baud rate
14312
37E8
$PRSTAT
Printer
status
(Read
Only)
"Go"
only
if:
Bit7
=
"NOT BUSY"
Bit6
=
"NOT OUT
OF
PAPER"
Bit5
=
1 "DEVICE
SELECT"
Bit4=1
"NOT
PRINTER
FAULT"
Bits
3,2, 1
and are not
used.
82