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Be more flexible about bios.

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This commit is contained in:
LemonBoy 2013-10-13 18:53:05 +00:00
parent 255d3462dd
commit 559e637cdb
1 changed files with 22 additions and 5 deletions
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27
source/emu.c
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@ -22,8 +22,26 @@ void emu_reset ()
cpu_reset();
}
int valid_rom_crc (const u16 crc)
{
const u16 known_crcs[] = {
0xAC8F, // 12288 BASIC.ROM
0x3F44, // 12288 apple.rom
};
int i;
for (i = 0; i < sizeof(known_crcs)/sizeof(u16); i++)
if (crc == known_crcs[i])
return 1;
return 0;
}
void emu_init ()
{
u16 crc;
int valid_crc;
keyboardShow();
// Set some sane defaults
@ -33,12 +51,11 @@ void emu_init ()
video_init();
// Load the appropriate bios
u16 crc;
/*load_bin("APPLE2.ROM", 0xB000, 0x5000, &crc);*/
if (load_bin("BASIC.ROM", 0xD000, 0x3000, &crc)) {
iprintf("BIOS CRC16 %04x (%s)\n", crc, (crc == 0xAC8F) ? "Valid" : "Invalid");
if (load_bin("apple.rom", 0xD000, 0x3000, &crc)) {
valid_crc = valid_rom_crc(crc);
iprintf("BIOS CRC16 %04x (%s)\n", crc, (valid_crc) ? "Valid" : "Invalid");
// Refuse to load a wrong bios
if (crc != 0xAC8F)
if (!valid_crc)
while (1);
} else {
iprintf("No BASIC.ROM found. Halting.");