TRS-SO
MODEL III
INP(port)
Returns a byte-value from the specified port. There are 256 ports, numbered 0-255.
Forexample
100 PRINT INP(50)
inputs a byte from port 50 and prints the decimal value
of
the byte.
You do
not need to access the Z-80 ports to make full use
of
the
TRS-80.
MEM
Returns the
number
of
unused and unprotected bytes in memory. This function may
be used in the Immediate
Mode
to see how much space a resident program takes up;
or
it may be used inside the program to avert
OM
(Out
of
Memory) errors by
allocating less string space, DIMensioning smallerarray sizes, etc.
MEM
requires no
argument.
Example:
100
IFMEM<80THEN900
Enterthe
command
PRINT
MEM
(in the Immediate Mode) to find out the amount
of
memory not being used to store programs, variables, strings, stack,
or
reserved for
object-files.
8/4
To Next Page
Loading...
