jake/SplitBit-Emulator
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Fixed bugs. 8 bit prime Sieve demo.

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This commit is contained in:
Anachronaut
2024-11-01 20:53:48 -04:00
committed by GitHub
parent 30eebbd9df
commit 2a691ba199
5 changed files with 89 additions and 15 deletions
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Source/Emulator/cpu.c
+6 -10
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@@ -276,11 +276,12 @@ uint8_t executeOperation(uint8_t Instruction, CPURegisters *cpu) {
break;
case 0x33:
// PSHD - Push the Data Pointer Address to the Stack.
// Order, low byte, high byte
cpu->Data[cpu->StackPointer] = cpu->DataPointer & 0xFF;
cpu->StackPointer--;
// Order, high byte, low byte
// This ordering makes it easier to add offsets with register math.
cpu->Data[cpu->StackPointer] = (cpu->DataPointer >> 8) & 0xFF;
cpu->StackPointer--;
cpu->Data[cpu->StackPointer] = cpu->DataPointer & 0xFF;
cpu->StackPointer--;
break;
case 0x34:
// POPA - Pop A from the Stack.
@@ -296,9 +297,9 @@ uint8_t executeOperation(uint8_t Instruction, CPURegisters *cpu) {
case 0x36:
// POPD - Pop Data Address from the Stack.
cpu->StackPointer++;
cpu->DataPointer = (uint16_t)cpu->Data[cpu->StackPointer] << 8;
cpu->DataPointer = (uint16_t)cpu->Data[cpu->StackPointer];
cpu->StackPointer++;
cpu->DataPointer |= (uint16_t)cpu->Data[cpu->StackPointer];
cpu->DataPointer |= (uint16_t)cpu->Data[cpu->StackPointer] << 8;
break;
//
// 4x - Data Operations:
@@ -381,11 +382,6 @@ uint8_t executeOperation(uint8_t Instruction, CPURegisters *cpu) {
cpu->ProgramCounter++;
cpu->B = InputHandler(cpu->Program[cpu->ProgramCounter]);
break;
case 0xE2:
// IND - Read an Input to Data Memory.
cpu->ProgramCounter++;
cpu->Data[cpu->DataPointer] = InputHandler(cpu->Program[cpu->ProgramCounter]);
break;
//
// Fx - Special Operations:
//