Apple-2-HW
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analog-firmware
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businterface performance tweaks and bugfixes for AGS

This commit is contained in:
David Kuder 2023-04-25 16:16:03 -04:00
parent 1b8a30ac1e
commit 0fa9fe4538
1 changed files with 35 additions and 31 deletions
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66
vga/businterface.c
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@ -8,6 +8,40 @@
volatile uint8_t *terminal_page = terminal_memory;
void __time_critical_func(vga_businterface)(uint32_t address, uint32_t value) {
// Shadow parts of the Apple's memory by observing the bus write cycles
if((address < 0xC000) && ((value & (1u << CONFIG_PIN_APPLEBUS_RW-CONFIG_PIN_APPLEBUS_DATA_BASE)) == 0)) {
// Apple IIgs: CARD_SELECT is pulled low by our CPLD when M2B0 is active and addr < $C000
#ifdef ANALOG_GS
if(CARD_SELECT) {
private_memory[address] = value & 0xff;
return;
}
#endif
// Mirror Video Memory from MAIN & AUX banks
if(soft_switches & SOFTSW_80STORE) {
if(soft_switches & SOFTSW_PAGE_2) {
if((address >= 0x400) && (address < 0x800)) {
private_memory[address] = value & 0xff;
return;
} else if((soft_switches & SOFTSW_HIRES_MODE) && (address >= 0x2000) && (address < 0x4000)) {
private_memory[address] = value & 0xff;
return;
}
}
} else if(soft_switches & SOFTSW_AUX_WRITE) {
if((address >= 0x200) && (address < 0xC000)) {
private_memory[address] = value & 0xff;
return;
}
}
if((address >= 0x200) && (address < 0xC000)) {
apple_memory[address] = value & 0xff;
return;
}
}
// Shadow the soft-switches by observing all read & write bus cycles
if((address & 0xff80) == 0xc000) {
switch(address & 0x7f) {
@ -176,38 +210,8 @@ void __time_critical_func(vga_businterface)(uint32_t address, uint32_t value) {
}
}
// Shadow parts of the Apple's memory by observing the bus write cycles
// Card Registers
if((value & (1u << CONFIG_PIN_APPLEBUS_RW-CONFIG_PIN_APPLEBUS_DATA_BASE)) == 0) {
// Mirror Video Memory from MAIN & AUX banks
if(soft_switches & SOFTSW_LINEARIZE) {
if((address >= 0x2000) && (address < 0xC000)) {
private_memory[address] = value & 0xff;
return;
}
}
if(soft_switches & SOFTSW_80STORE) {
if(soft_switches & SOFTSW_PAGE_2) {
if((address >= 0x400) && (address < 0x800)) {
private_memory[address] = value & 0xff;
return;
} else if((soft_switches & SOFTSW_HIRES_MODE) && (address >= 0x2000) && (address < 0x4000)) {
private_memory[address] = value & 0xff;
return;
}
}
} else if(soft_switches & SOFTSW_AUX_WRITE) {
if((address >= 0x200) && (address < 0xC000)) {
private_memory[address] = value & 0xff;
return;
}
}
if((address >= 0x200) && (address < 0xC000)) {
apple_memory[address] = value & 0xff;
return;
}
if(CARD_SELECT && CARD_DEVSEL) {
cardslot = (address >> 4) & 0x7;
switch(address & 0x0F) {