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Make LR35902 a little more like the Z80

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Signed-off-by: Adrian.Conlon <adrian.conlon@gmail.com>
This commit is contained in:
Adrian.Conlon 2017-06-11 23:56:11 +01:00
parent eb8a93726d
commit 8f3aef1c3e
1 changed files with 17 additions and 8 deletions
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25
LR35902/src/LR35902.cpp
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@ -21,6 +21,7 @@ void EightBit::LR35902::initialise() {
IntelProcessor::initialise(); IntelProcessor::initialise();
AF().word = 0xffff; AF().word = 0xffff;
BC().word = 0xffff; BC().word = 0xffff;
DE().word = 0xffff; DE().word = 0xffff;
HL().word = 0xffff; HL().word = 0xffff;
@ -535,19 +536,23 @@ void EightBit::LR35902::executeOther(int x, int y, int z, int p, int q) {
case 0: case 0:
switch (p) { switch (p) {
case 0: // LD (BC),A case 0: // LD (BC),A
m_memory.set(BC().word, A()); MEMPTR() = BC();
setViaMemptr(A());
cycles += 2; cycles += 2;
break; break;
case 1: // LD (DE),A case 1: // LD (DE),A
m_memory.set(DE().word, A()); MEMPTR() = DE();
setViaMemptr(A());
cycles += 2; cycles += 2;
break; break;
case 2: // GB: LDI (HL),A case 2: // GB: LDI (HL),A
m_memory.set(HL().word++, A()); MEMPTR().word = HL().word++;
setViaMemptr(A());
cycles += 2; cycles += 2;
break; break;
case 3: // GB: LDD (HL),A case 3: // GB: LDD (HL),A
m_memory.set(HL().word--, A()); MEMPTR().word = HL().word--;
setViaMemptr(A());
cycles += 2; cycles += 2;
break; break;
} }
@ -555,19 +560,23 @@ void EightBit::LR35902::executeOther(int x, int y, int z, int p, int q) {
case 1: case 1:
switch (p) { switch (p) {
case 0: // LD A,(BC) case 0: // LD A,(BC)
A() = m_memory.get(BC().word); MEMPTR() = BC();
A() = getViaMemptr();
cycles += 2; cycles += 2;
break; break;
case 1: // LD A,(DE) case 1: // LD A,(DE)
A() = m_memory.get(DE().word); MEMPTR() = DE();
A() = getViaMemptr();
cycles += 2; cycles += 2;
break; break;
case 2: // GB: LDI A,(HL) case 2: // GB: LDI A,(HL)
A() = m_memory.get(HL().word++); MEMPTR().word = HL().word++;
A() = m_memory.reference();
cycles += 2; cycles += 2;
break; break;
case 3: // GB: LDD A,(HL) case 3: // GB: LDD A,(HL)
A() = m_memory.get(HL().word--); MEMPTR().word = HL().word--;
A() = m_memory.reference();
cycles += 2; cycles += 2;
break; break;
} }