ADDREG
Syntax |
ADDREG |
Location |
TRAPS (DIY Toolkit Vol T) |
This function returns the value of the following Machine code address register following the completion of a MTRAP, QTRAP or BTRAP command.
Command |
Machine Code Register Value Returned. |
|---|---|
MTRAP |
A0 |
QTRAP |
A1 |
BTRAP |
A1 (relative to A6) - can be used by BPEEK%. |
Example
You could replace the ALCHP function with:
100 bytes=100 : REMark Number of bytes required
110 MTRAP 24,bytes,-1
120 IF DATAREG < 0 : REPORT DATAREG : REMark an error has occurred
130 IF DATAREG (1) < bytes : PRINT 'Requested area not allocated':STOP
140 base=ADDREG
CROSS-REFERENCE
DATAREG allows you to read machine code data registers.