pTAL Conversion Guide

pTAL Built-In Routines

pTAL Conversion Guide—527302-002

18-44

$SGWADDR_TO_SGBADDR

$SGWADDR_TO_SGBADDR converts an SGWADDR or SGXWADDR address to an

SGBADDR address.

expression

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

If expression is not an address in the lower half of the 64K-word segment, the

address returned by $SGWADDR_TO_SGBADDR is undefined.

$STACK_ALLOCATE

$STACK_ALLOCATE allocates a block of memory and returns the address of the

block.

pTAL privileged procedure No

Can be executed only by privileged procedures No

Sets condition code No

Sets $CARRY No

Sets $OVERFLOW No

Example 18-33. Call to $SGWADDR_TO_SGBADDR Routine

STRING .SG s;

INT .SG i;

@s := $SGWADDR_TO_SGBADDR(@i); ! OK if i is in the lower half

! of system globals

Note. The pTAL and EpTAL compilers behave differently.

expression( )

VST690.vsd

$SGWADDR_TO_SGBADDR

( size )

VST032.vsd

$STACK_ALLOCATE