Here is a ZX81 test program, which counts "link_no" down from 2 to -1. But when the expected value should be 0, -256 is printed!
Code: Select all
//zcc +zx81 -startup=2 -create-app -vn -o testint.bin testint.c
#include <stdio.h>
#include <zx81.h>
#include <string.h>
void main(void)
{
int line = 0;
int link_no = 0;
int checkline;
char show_dir;
char key;
char is_link, is_prog, wait_for_return, wait_for_key_released, show_len;
char addr[10];
link_no++;
link_no++;
printf("link_no(2)=%d\n", link_no);
link_no--;
printf("link_no(1)=%d\n", link_no);
link_no--;
printf("link_no(0)=%d\n", link_no);
link_no--;
printf("link_no(-1)=%d\n", link_no);
}2
1
-256
-1
Siggi
