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sms, memory mapping improvements

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This commit is contained in:
kub 2021-10-08 19:34:15 +02:00
parent 47ea630f6d
commit 032c76a3a2
4 changed files with 69 additions and 41 deletions
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11
pico/media.c
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@ -35,8 +35,8 @@ static int detect_media(const char *fname)
{
static const short sms_offsets[] = { 0x7ff0, 0x3ff0, 0x1ff0 };
static const char *sms_exts[] = { "sms", "gg", "sg" };
static const char *md_exts[] = { "gen", "bin", "smd" };
char buff0[32], buff[32];
static const char *md_exts[] = { "gen", "smd" };
char buff0[512], buff[32];
unsigned short *d16;
pm_file *pmf;
char ext[5];
@ -56,7 +56,7 @@ static int detect_media(const char *fname)
if (pmf == NULL)
return PM_BAD_DETECT;
if (pm_read(buff0, 32, pmf) != 32) {
if (pm_read(buff0, 512, pmf) != 512) {
pm_close(pmf);
return PM_BAD_DETECT;
}
@ -111,6 +111,11 @@ extension_check:
lprintf("bad MD reset vector, assuming SMS\n");
goto looks_like_sms;
}
d16 = (unsigned short *)(buff0 + 0x1a0);
if ((((d16[0] << 16) | d16[1]) & 0xffffff) != 0) {
lprintf("bad MD rom start, assuming SMS\n");
goto looks_like_sms;
}
looks_like_md:
pm_close(pmf);