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fix transcription error in mouse rom; update irq semantics

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This commit is contained in:
Jorj Bauer 2021-01-16 08:33:09 -05:00
parent 55703a0838
commit c5f0985fc2
6 changed files with 23 additions and 16 deletions
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2
apple/mouse-rom.h
View File

@ -16,7 +16,7 @@ static
0x68, 0xAA, 0x68, 0xEA, 0x68, 0x99, 0x80, 0xC0,
0x60, 0x99, 0x81, 0xC0, 0x68, 0xBD, 0x38, 0x06,
0xAA, 0x68, 0xA8, 0x68, 0xBD, 0x00, 0x02, 0x60,
0xC9, 0x0A, 0xB0, 0x04, 0x8D, 0xCF, 0xC0, 0x60,
0xC9, 0x10, 0xB0, 0x04, 0x8D, 0xCF, 0xC0, 0x60,
0x38, 0x60, 0x48, 0x78, 0x8D, 0xCE, 0xC0, 0xA2,
0x04, 0xBD, 0xB8, 0x06, 0x29, 0x0E, 0xD0, 0x01,
0x38, 0x68, 0x60, 0x8D, 0xCB, 0xC0, 0x18, 0x60,

12
apple/mouse.cpp
View File

@ -10,6 +10,8 @@
enum {
SW_W_INITPR = 0x00,
SW_W_HANDLEIN = 0x01,
SW_R_ERR = 0x07,
SW_R_HOMEMOUSE = 0x08,
SW_R_POSMOUSE = 0x09,
@ -159,6 +161,7 @@ void Mouse::writeSwitches(uint8_t s, uint8_t v)
g_vm->getMMU()->write(0x778+4, interruptsTriggered);
g_vm->getMMU()->write(0x6B8+4, interruptsTriggered); // hack to appease ROM
interruptsTriggered = 0;
g_cpu->deassertIrq();
break;
case SW_W_CLAMPMOUSE:
{
@ -198,7 +201,7 @@ void Mouse::loadROM(uint8_t *toWhere)
toWhere[i] = pgm_read_byte(&romData[i]);
}
#else
printf("loading HD32 rom\n");
printf("loading Mouse rom\n");
memcpy(toWhere, romData, 256);
#endif
}
@ -216,11 +219,10 @@ void Mouse::maintainMouse(int64_t cycleCount)
{
// Fake a 60Hz VBL in case we need it for our interrupts
static int64_t nextInterruptTime = cycleCount + 17050;
if ( (status & ST_MOUSEENABLE) &&
(status & ST_INTVBL) &&
(cycleCount >= nextInterruptTime) ) {
g_cpu->irq();
g_cpu->assertIrq();
interruptsTriggered |= ST_INTVBL;
@ -232,14 +234,14 @@ void Mouse::maintainMouse(int64_t cycleCount)
if ( (status & ST_MOUSEENABLE) &&
(status & ST_INTMOUSE) &&
(xpos != lastXForInt || ypos != lastYForInt) ) {
g_cpu->irq();
g_cpu->assertIrq();
interruptsTriggered |= ST_INTMOUSE;
lastXForInt = xpos; lastYForInt = ypos;
} else if ( (status & ST_MOUSEENABLE) &&
(status & ST_INTBUTTON) &&
lastButtonForInt != g_mouse->getButton()) {
g_cpu->irq();
g_cpu->assertIrq();
interruptsTriggered |= ST_INTBUTTON;
lastButtonForInt = g_mouse->getButton();

2
apple/mouserom.asm
View File

@ -85,7 +85,7 @@ INHandler:
RTS
SetMouse:
CMP #$0A ; values >= 10 are invalid
CMP #$10 ; values >= $10 are invalid
BCS ExitWithError
STA $C0CF ; soft switch 0x0F, hard-coded slot 4 for now
RTS

2
apple/mouserom.lst
View File

@ -89,7 +89,7 @@ Current file: mouserom.asm
00C45F 1 60 RTS
00C460 1
00C460 1 SetMouse:
00C460 1 C9 0A CMP #$0A ; values >= 10 are invalid
00C460 1 C9 10 CMP #$10 ; values >= $10 are invalid
00C462 1 B0 04 BCS ExitWithError
00C464 1 8D CF C0 STA $C0CF ; soft switch 0x0F, hard-coded slot 4 for now
00C467 1 60 RTS

16
cpu.cpp
View File

@ -444,6 +444,16 @@ void Cpu::brk()
cycles += 2;
}
void Cpu::assertIrq()
{
irqPending = true;
}
void Cpu::deassertIrq()
{
irqPending = false;
}
void Cpu::irq()
{
// If interrupts are disabled, then do nothing
@ -472,7 +482,6 @@ uint8_t Cpu::Run(uint8_t numSteps)
uint8_t Cpu::step()
{
if (irqPending) {
irqPending = false;
irq();
}
@ -1217,11 +1226,6 @@ uint16_t Cpu::popS16()
return (msb << 8) | lsb;
}
void Cpu::stageIRQ()
{
irqPending = true;
}
void Cpu::realtime()
{
realtimeProcessing = true;

5
cpu.h
View File

@ -151,6 +151,9 @@ class Cpu {
void brk();
void irq();
void assertIrq();
void deassertIrq();
uint8_t Run(uint8_t numSteps);
uint8_t step();
@ -161,8 +164,6 @@ class Cpu {
uint8_t SP();
uint8_t P();
void stageIRQ();
protected:
// Stack manipulation
void pushS8(uint8_t b);