The BBC and Master Computer Public Domain Library

ADEC ADVAL

Submitted by Steve Fewell

Description:

Call routine &96B4 to obtain the Integer value from the expression after the ADVAL keyword (issue 'Type mismatch' error
if a String value was found).
Set X (the OSBYTE parameter) to the byte at location &2A (The LSB of the Integer ADVAL parameter obtained).
Perform the OSBYTE #&80 command to execute the ADVAL function.
On return, X will be the low byte (LSB) of the ADVAL return value and Y will be the high byte (MSB) of the ADVAL return
value.
Set A to the value of X (the LSB of the return value of the OSBYTE ADVAL call).
Call routine &AE1A to set the IWA to the 2-byte value of: A (low byte) and Y (high byte).

Disassembly for the ADVAL routine