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Magnum One (Mid-American Digital) (Disc Manufacturing).iso
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ptv1n6.arc
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UNTSR.C
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1991-01-21
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1KB
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29 lines
#pragma inline
#include <dos.h>
unsigned getpsp(void) /* getpsp() returns segment */
{ /* value of the current PSP */
if (_osmajor < 3) _AH = 0x51; /* pointer. Service 0x62 */
else _AH = 0x62; /* is used preferentially, */
asm int 21h /* but is unavailable to */
_AX = _BX; /* versions before DOS 3.0 */
}
void setpsp(unsigned segment) /* setpsp() sets DOS's */
{ /* current PSP pointer to */
_AH = 0x50; /* segment value passed. */
_BX = segment;
asm int 21h
}
int freemem(unsigned segment) /* freemem() frees memory */
{ /* beginning at the segment */
_AH = 0x49; /* value passed. Current */
_ES = segment; /* PSP pointer must aggree */
asm int 21h /* with owner of block to */
asm jc nok /* succeed. Returns zero */
_AX = 0; /* if successful, DOS error */
nok: /* code if unsuccessful. */
;
}