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[patinho] fixing PLA instruction and implementing PUG instruction.

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This commit is contained in:
Felipe Corrêa da Silva Sanches 2015-11-29 19:16:16 -02:00
parent 9037168f33
commit 59e2a7bb4f
1 changed files with 11 additions and 1 deletions
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12
src/devices/cpu/patinhofeio/patinho_feio.cpp
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@ -125,10 +125,20 @@ void patinho_feio_cpu_device::execute_instruction()
switch (opcode & 0xF0){
case 0x00:
//PLA = "Pula": Jump to address
addr = READ_BYTE_PATINHO(PC) & 0xFFF;
addr = (opcode & 0x0F) << 8 | READ_BYTE_PATINHO(PC);
INCREMENT_PC_4K;
PC = addr;
return;
case 0xF0:
//PUG = "Pula e guarda": Jump and store.
// It stores the return address to addr and addr+1
// And then jumps to addr+2
addr = (opcode & 0x0F) << 8 | READ_BYTE_PATINHO(PC);
INCREMENT_PC_4K;
WRITE_BYTE_PATINHO(addr, 0x12);//(PC >> 8) & 0x0F);
WRITE_BYTE_PATINHO(addr+1, 0x34);//PC & 0xFF);
PC = addr+2;
return;
}
printf("unimplemented opcode: 0x%02X\n", opcode);
}