Apple-2-Tools/bradgrantham-apple2e
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fix hgr scanout addresses, modulo 0x2000

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This commit is contained in:
Brad Grantham 2018-07-31 14:51:51 -07:00
parent 9d5d4b4a35
commit 114af20792
1 changed files with 10 additions and 2 deletions
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12
apple2e.cpp
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@ -521,9 +521,9 @@ int get_hires_scanout_address(int byte_in_frame)
int line_in_frame = byte_in_frame / 65;
int byte_in_line = byte_in_frame % 65;
if(byte_in_line < 25)
return hires_blanking_address_base[line_in_frame] + byte_in_line;
return 0x2000 + (hires_blanking_address_base[line_in_frame] + byte_in_line) % 0x2000;
return hires_visible_address_base[line_in_frame] + byte_in_line - 25;
return 0x2000 + (hires_visible_address_base[line_in_frame] + byte_in_line - 25) % 0x2000;
}
static int text_blanking_address_base[] =
@ -2849,6 +2849,14 @@ extern uint16_t pc;
int main(int argc, char **argv)
{
if(0) {
for(int i = 0; i < 262; i++) {
int addr = i * 65;
printf("hires scanout address for %d = $%04X\n", addr, get_hires_scanout_address(addr));
printf("hires scanout address for %d = $%04X\n", addr + 25, get_hires_scanout_address(addr + 25));
}
exit(0);
}
char *progname = argv[0];
argc -= 1;
argv += 1;