Radio Shack TRS-80 Model III - InputOutput Initialization

OPERATION
11
/
Input/Output
Initialization
Whenever
you
start
or reset the Computer, the
input/output routines ("I/O drivers")
are initialized
to their default values (as explained in
the following chapters). For
example, the Video Display is
initialized
to have a
blinking cursor.
As
described in the previous chapters , there are ways
for you to alter these default
characteristics via a BASIC or Z-80 program. Because
of this feature, it is important
to
have a
means of resetting the I/O drivers to their default
conditions.
Model III has a ROM
subroutine to re-initialize all I/O drivers to their default values.
WecallitSlNlTlO.
The following BASIC program
shows
how to use SINITIO.
10
POKE
16326,
105
'
LSB
OF *
I
NIT
10
ENTRY
ADDRESS
20
POKE
16527*
'MSB
30 X
=
USR(0)
'CALL
*INITIO
Run this
program whenever you want to restore the I/O
drivers to their initial
characteristics.
57