/* Callbacks from piacore to store effective output, taking DDR into account */
static void store_pa(BYTE byte)
{
output_porta = byte;
mem_bank = (byte & 0x07) << 10;
hires_off = byte & 0x10;
charrom_on = byte & 0x08;
#if DWW_DEBUG_REG || DWW_DEBUG_RAM
log_message(petdww_log, "mem_bank = %04x", mem_bank);
#endif
#if DWW_DEBUG_REG
log_message(petdww_log, "hires_off = %04x", hires_off);
log_message(petdww_log, "charrom_on = %04x", charrom_on);
#endif
if (hires_off) {
if (charrom_on) {
crtc_set_hires_draw_callback(NULL);
} else {
crtc_set_hires_draw_callback(petdww_DRAW_blank);
}
} else {
if (petres.video == 80) {
crtc_set_hires_draw_callback(petdww_DRAW_80);
} else {
crtc_set_hires_draw_callback(petdww_DRAW_40);
}
}
}
void crtc_store_hre(WORD addr, BYTE value)
{
if (pethre_enabled) {
/* printf("HRE: enabled... %4x %2x\n", addr, value); */
/* E888 is the usual address */
if (addr & 0x0008) { /* turn ROMs on or off */
if (value != reg_E888) {
if (value == 0x0F) { /* ROMs on */
/* printf("HRE: ROMs on\n"); */
petmem_ramON = 0;
petres.ramsel9 = 0;
petres.ramselA = 0;
ramsel_changed();
} else if (value == 0x83) { /* ROMs off */
/* printf("HRE: ROMs off\n"); */
petmem_ramON = 1;
petres.ramsel9 = 0;
petres.ramselA = 0;
ramsel_changed();
}
reg_E888 = value;
} else {
/* printf("HRE: $%04X <- %02X\n", addr, value); */
}
} else if (addr & 0x0001) {
/*
* The register that contains the high byte of the screen
* address is used to turn the hi-res graphics on or off.
* In real hardware, this address line (MA12) goes to a
* jumper which the HRE board spies on.
*/
if (crtc.regno == 0x0c) {
if (value & CRTC_MA12) { /* off */
/* printf("HRE: Hi-Res off: start=%02X\n", value); */
crtc_set_hires_draw_callback(NULL);
} else { /* on */
/* printf("HRE: Hi-Res on: start=%02X\n", value); */
crtc_set_hires_draw_callback(pethre_DRAW);
}
}
}
} else {
/* printf("HRE: not enabled... %4x %2x\n", addr, value); */
}
}
