static inline BYTE io_read(io_source_list_t *list, WORD addr)
{
io_source_list_t *current = list->next;
int io_source_counter = 0;
BYTE realval = 0;
BYTE retval = 0;
unsigned int lowest_order = 0xffffffff;
vicii_handle_pending_alarms_external(0);
while (current) {
if (current->device->read != NULL) {
if ((addr >= current->device->start_address) && (addr <= current->device->end_address)) {
retval = current->device->read((WORD)(addr & current->device->address_mask));
if (current->device->io_source_valid) {
if (current->device->io_source_prio == IO_PRIO_HIGH) {
return retval;
}
if (io_source_collision_handling == IO_COLLISION_METHOD_DETACH_LAST) {
if (current->device->order < lowest_order) {
lowest_order = current->device->order;
realval = retval;
}
}
if (io_source_collision_handling == IO_COLLISION_METHOD_AND_WIRES) {
realval &= retval;
}
if (current->device->io_source_prio != IO_PRIO_LOW) {
io_source_counter++;
}
}
}
}
current = current->next;
}
if (io_source_counter == 0) {
return vicii_read_phi1();
}
if (io_source_counter == 1) {
return retval;
}
if (io_source_collision_handling == IO_COLLISION_METHOD_DETACH_ALL) {
io_source_msg_detach_all(addr, io_source_counter, list);
return vicii_read_phi1();
}
if (io_source_collision_handling == IO_COLLISION_METHOD_DETACH_LAST) {
io_source_msg_detach_last(addr, io_source_counter, list, lowest_order);
return realval;
}
if (io_source_collision_handling == IO_COLLISION_METHOD_AND_WIRES) {
io_source_log_collisions(addr, io_source_counter, list);
return realval;
}
return vicii_read_phi1();
}
BYTE REGPARM1 actionreplay_io2_read(WORD addr)
{
if (!ar_active)
return vicii_read_phi1();
io_source = IO_SOURCE_ACTION_REPLAY;
if (export_ram)
return export_ram0[0x1f00 + (addr & 0xff)];
switch (roml_bank) {
case 0:
return roml_banks[addr & 0x1fff];
case 1:
return roml_banks[(addr & 0x1fff) + 0x2000];
case 2:
return roml_banks[(addr & 0x1fff) + 0x4000];
case 3:
return roml_banks[(addr & 0x1fff) + 0x6000];
}
io_source = IO_SOURCE_NONE;
return 0;
}
static BYTE kcs_io2_read(WORD addr)
{
/* the software reads from df80 at beginning of nmi handler */
/* to determine the status of GAME and EXROM lines */
if (addr & 0x80) {
return ((config & 2) ? 0x80 : 0) | ((config & 1) ? 0 : 0x40) | (vicii_read_phi1() & 0x3f); /* DF80-DFFF actual config */
}
return export_ram0[addr & 0x7f];
}
static uint8_t ramcart_io1_read(uint16_t addr)
{
uint8_t retval;
if (addr == 1 && ramcart_size_kb == 128) {
retval = vicii_read_phi1() & 0x7e;
retval += ramcart[addr];
} else {
retval = ramcart[addr];
}
return retval;
}
static BYTE REGPARM1 ramcart_reg_read(WORD addr)
{
BYTE retval;
if (addr == 1 && ramcart_size_kb == 128)
{
retval = vicii_read_phi1() & 0x7e;
retval += ramcart[addr];
}
else
retval = ramcart[addr];
return retval;
}
BYTE REGPARM1 stardos_io2_read(WORD addr)
{
if(addr==0xdfa1)
{
++cnt_dfa1;
if(cnt_dfa1>0xff)
{
/* disable bank 0 at $8000 */
cartridge_config_changed(2, 2, CMODE_READ);
cnt_de61=0;
}
}
return vicii_read_phi1();
}
/* peek from i/o area with no side-effects */
static inline BYTE io_peek(io_source_list_t *list, WORD addr)
{
io_source_list_t *current = list->next;
while (current) {
if (addr >= current->device->start_address && addr <= current->device->end_address) {
if (current->device->peek) {
return current->device->peek((WORD)(addr & current->device->address_mask));
} else if (current->device->read) {
return current->device->read((WORD)(addr & current->device->address_mask));
}
}
current = current->next;
}
return vicii_read_phi1();
}
static inline BYTE io_read(io_source_list_t *list, WORD addr)
{
io_source_list_t *current = list->next;
int io_source_counter = 0;
int io_source_valid = 0;
BYTE realval = 0;
BYTE retval = 0;
BYTE firstval = 0;
unsigned int lowest_order = 0xffffffff;
vicii_handle_pending_alarms_external(0);
while (current) {
if (current->device->read != NULL) {
if ((addr >= current->device->start_address) && (addr <= current->device->end_address)) {
retval = current->device->read((WORD)(addr & current->device->address_mask));
if (current->device->io_source_valid) {
/* high prio always overrides others, return immediatly */
if (current->device->io_source_prio == IO_PRIO_HIGH) {
return retval;
}
if (io_source_valid == 0) {
/* on first valid read, initialize intermediate values */
firstval = realval = retval;
lowest_order = current->device->order;
/* do not count low prio, as it will always be overridden by others */
if (current->device->io_source_prio != IO_PRIO_LOW) {
io_source_counter++;
}
io_source_valid = 1;
} else {
/* ignore low prio reads when a real value is present already */
if (current->device->io_source_prio == IO_PRIO_LOW) {
retval = realval;
}
if (io_source_collision_handling == IO_COLLISION_METHOD_DETACH_LAST) {
if (current->device->order < lowest_order) {
lowest_order = current->device->order;
realval = retval;
}
} else if (io_source_collision_handling == IO_COLLISION_METHOD_AND_WIRES) {
realval &= retval;
}
/* do not count low prio, as it will always be overridden by others */
if (current->device->io_source_prio != IO_PRIO_LOW) {
/* if the nth read returns the same as the first read don't see it as a conflict */
if (retval != firstval) {
io_source_counter++;
}
}
}
}
}
}
current = current->next;
}
/* no valid I/O source was read, return phi1 */
if (io_source_valid == 0) {
return vicii_read_phi1();
}
/* only one valid I/O source was read, return value */
if (!(io_source_counter > 1)) {
return retval;
}
/* more than one I/O source was read, handle collision */
if (io_source_collision_handling == IO_COLLISION_METHOD_DETACH_ALL) {
io_source_msg_detach_all(addr, io_source_counter, list);
return vicii_read_phi1();
} else if (io_source_collision_handling == IO_COLLISION_METHOD_DETACH_LAST) {
io_source_msg_detach_last(addr, io_source_counter, list, lowest_order);
return realval;
} else if (io_source_collision_handling == IO_COLLISION_METHOD_AND_WIRES) {
io_source_log_collisions(addr, io_source_counter, list);
return realval;
}
return vicii_read_phi1();
}
int ultimax_romh_phi2_read(WORD addr, BYTE *value)
{
/* default; no cart, open bus */
*value = vicii_read_phi1();
return 1;
}
/* ultimax read - c000 to cfff */
BYTE ultimax_c000_cfff_read(WORD addr)
{
/* default; no cart, open bus */
return vicii_read_phi1();
}
/* ROMH read if hirom is selected - mapped to E000 in ultimax */
BYTE ultimax_romh_read_hirom(WORD addr)
{
return vicii_read_phi1();
}
/* ROMH read - mapped to A000 in 16k, to E000 in ultimax */
BYTE romh_read(WORD addr)
{
return vicii_read_phi1();
}
BYTE REGPARM1 actionreplay_io1_read(WORD addr)
{
return vicii_read_phi1();
}