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[patinho] Implement CAR and CARX instructions

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This commit is contained in:
Felipe Corrêa da Silva Sanches 2015-11-30 15:17:50 -02:00
parent 3e7b0c6fa9
commit 6d06383a6a
1 changed files with 14 additions and 0 deletions
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14
src/devices/cpu/patinhofeio/patinho_feio.cpp
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@ -380,6 +380,20 @@ void patinho_feio_cpu_device::execute_instruction()
addr = compute_effective_address(m_idx + value); addr = compute_effective_address(m_idx + value);
WRITE_BYTE_PATINHO(addr, ACC); WRITE_BYTE_PATINHO(addr, ACC);
return; return;
case 0x40:
//CAR = "Carrega": Load a value from a given memory position into the accumulator
addr = compute_effective_address((opcode & 0x0F) << 8 | READ_BYTE_PATINHO(PC));
INCREMENT_PC_4K;
ACC = READ_BYTE_PATINHO(addr);
return;
case 0x50:
//CARX = "Carga indexada": Load a value from a given indexed memory position into the accumulator
value = (opcode & 0x0F) << 8 | READ_BYTE_PATINHO(PC);
INCREMENT_PC_4K;
m_idx = READ_INDEX_REG();
addr = compute_effective_address(m_idx + value);
ACC = READ_BYTE_PATINHO(addr);
return;
case 0xF0: case 0xF0:
//PUG = "Pula e guarda": Jump and store. //PUG = "Pula e guarda": Jump and store.
// It stores the return address to addr and addr+1 // It stores the return address to addr and addr+1