🚀 go-pugleaf

TurboC++ Professional gives an example program gives a short
TSR program in the Reference guide under the keep() function.

I try compiling:

	 tcc -mt -lt -k- -I../include keep.c 

And get the error message:
     Cannot generate .COM file: segment-relocatable items present.

Must TSR's be .COM files?

I comment out the setvect() statement and it links fine. In TC 2.0
it links fine. How do I get around this? Here is a one-page TSR that
is very similar (DO NOT EXECUTE IT!!!! IT CAN DESTROY YOUR DISK!!):

#include <dos.h>
#define DISK_VECT 0x13           /* This program was intended to flash the */
extern unsigned int _heaplen;    /* upper right-hand corner during ANY disk*/
extern unsigned int _stklen;     /* operation...DO NOT RUN THIS PROGRAM!!! */
void interrupt new_disk(void);
void interrupt (*old_disk)();
#error This statement added to warn all not to run this program!!!
void new_disk(void)
{
static unsigned int far *screen = MK_FP(0xB800, 0000);

screen[80] ^= 0x00ff;  /* this line DESTROYS certain registers for int 13h */
(*old_disk)();
screen[80] ^= 0x00ff;
}

main(void)
{
old_disk = getvect(DISK_INT);
setvect(DISK_INT, &new_disk); /* comment this line and TC++ 1.0 produces    */
_heaplen = 512;               /* .COM ok. TC 2.0 works in both cases...     */
_stklen  = 0x1000;
keep(0, 0x1000);
}

How do I get the registers as they were on entry to new_disk() (they are
destroyed by the screen[80] ^= 0x00ff;) before calling old_disk?

uunet!mcnc!unccvax!cs00chs

uunet!decvax!pyrdc!clt2!jjr
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