pTAL Conversion Guide

pTAL Built-In Routines

pTAL Conversion Guide—527302-002

18-43

TAL

TNS processes ignore the low-order bit of expression; therefore, if the low-order bit is

1, your program addresses the byte at the next lower byte address than that specified

by expression.

pTAL

Native processes do not support this “round-down” effect. The value returned by

$SGBADDR_TO_SGWADDR for programs run as native processes is undefined if the

least significant bit of expression is 1.

$SGWADDR_TO_EXTADDR

$SGWADDR_TO_EXTADDR converts an SGWADDR or SGXWADDR address to an

EXTADDR address.

expression

is an expression whose value is an SGWADDR or SGXWADDR address.

$SGWADDR_TO_EXTADDR returns expression converted to an EXTADDR

address.

pTAL privileged procedure No

Can be executed only by privileged procedures No

Sets condition code No

Sets $CARRY No

Sets $OVERFLOW No

Example 18-32. Call to $SGWADDR_TO_EXTADDR Routine

STRING .EXT s;

INT .SG i;

@s := $SGWADDR_TO_EXTADDR(@i);

expression( )

VST605.vsd

$SGWADDR_TO_EXTADDR