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(MESS) fixed a small bug in the decryption of multi-ROM pegasus programs.

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many thanks amilo3438 for testing! nw.
This commit is contained in:
Fabio Priuli 2014-09-25 16:00:30 +00:00
parent 7939397998
commit cd58792af1
1 changed files with 6 additions and 7 deletions
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13
src/mess/drivers/pegasus.c
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@ -94,7 +94,7 @@ public:
UINT32 screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
DECLARE_DRIVER_INIT(pegasus);
TIMER_DEVICE_CALLBACK_MEMBER(pegasus_firq);
void pegasus_decrypt_rom(UINT8 *ROM);
void pegasus_decrypt_rom(UINT8 *ROM, bool force_decrypt);
int load_cart(device_image_interface &image, generic_slot_device *slot, const char *reg_tag);
DECLARE_DEVICE_IMAGE_LOAD_MEMBER(exp00_load) { return load_cart(image, m_exp_00, "0000"); }
@ -389,14 +389,14 @@ GFXDECODE_END
/* An encrypted single rom starts with 02, decrypted with 20. Not sure what
multipart roms will have. */
void pegasus_state::pegasus_decrypt_rom(UINT8 *ROM)
void pegasus_state::pegasus_decrypt_rom(UINT8 *ROM, bool force_decrypt)
{
UINT8 b;
UINT16 j;
dynamic_buffer temp_copy;
temp_copy.resize(0x1000);
if (ROM[0] == 0x02)
if (ROM[0] == 0x02 || force_decrypt)
{
for (int i = 0; i < 0x1000; i++)
{
@ -424,7 +424,6 @@ int pegasus_state::load_cart(device_image_interface &image, generic_slot_device
{
// we might be loading a cart compatible with all sockets!
// so try to get region "rom"
printf("universal\n");
size = slot->common_get_size("rom");
any_socket = true;
@ -440,8 +439,8 @@ int pegasus_state::load_cart(device_image_interface &image, generic_slot_device
slot->rom_alloc(0x1000, GENERIC_ROM8_WIDTH, ENDIANNESS_LITTLE); // we alloc 0x1000 also for smaller roms!
slot->common_load_rom(slot->get_rom_base(), size, any_socket ? "rom" : reg_tag);
// raw images have to be decrypted
pegasus_decrypt_rom(slot->get_rom_base());
// raw images have to be decrypted (in particular the ones from softlist)
pegasus_decrypt_rom(slot->get_rom_base(), image.software_entry() != NULL);
return IMAGE_INIT_PASS;
}
@ -473,7 +472,7 @@ DRIVER_INIT_MEMBER(pegasus_state, pegasus)
{
// decrypt monitor
UINT8 *base = memregion("maincpu")->base() + 0xf000;
pegasus_decrypt_rom(base);
pegasus_decrypt_rom(base, FALSE);
}
static MACHINE_CONFIG_START( pegasus, pegasus_state )