Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-04-20 15:32:45 +03:00
Code Issues Actions 6 Packages Projects Releases Wiki Activity

[patinho] Implement PLAN and PLAZ instructions and fix a bug in all of the instructions dealing with indexed memory access

Browse Source
This commit is contained in:
Felipe Corrêa da Silva Sanches 2015-11-30 16:02:46 -02:00
parent 357127bcb1
commit 9729ebc804
1 changed files with 22 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
src/devices/cpu/patinhofeio/patinho_feio.cpp
View File

@ -361,10 +361,10 @@ void patinho_feio_cpu_device::execute_instruction()
return;
case 0x10:
//PLAX = "Pula indexado": Jump to indexed address
value = (opcode & 0x0F) << 8 | READ_BYTE_PATINHO(PC);
tmp = (opcode & 0x0F) << 8 | READ_BYTE_PATINHO(PC);
INCREMENT_PC_4K;
m_idx = READ_INDEX_REG();
PC = compute_effective_address(m_idx + value);
PC = compute_effective_address(m_idx + tmp);
return;
case 0x20:
//ARM = "Armazena": Store the value of the accumulator into a given memory position
@ -374,10 +374,10 @@ void patinho_feio_cpu_device::execute_instruction()
return;
case 0x30:
//ARMX = "Armazena indexado": Store the value of the accumulator into a given indexed memory position
value = (opcode & 0x0F) << 8 | READ_BYTE_PATINHO(PC);
tmp = (opcode & 0x0F) << 8 | READ_BYTE_PATINHO(PC);
INCREMENT_PC_4K;
m_idx = READ_INDEX_REG();
addr = compute_effective_address(m_idx + value);
addr = compute_effective_address(m_idx + tmp);
WRITE_BYTE_PATINHO(addr, ACC);
return;
case 0x40:
@ -388,10 +388,10 @@ void patinho_feio_cpu_device::execute_instruction()
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);
tmp = (opcode & 0x0F) << 8 | READ_BYTE_PATINHO(PC);
INCREMENT_PC_4K;
m_idx = READ_INDEX_REG();
addr = compute_effective_address(m_idx + value);
addr = compute_effective_address(m_idx + tmp);
ACC = READ_BYTE_PATINHO(addr);
return;
case 0x60:
@ -403,13 +403,27 @@ void patinho_feio_cpu_device::execute_instruction()
return;
case 0x70:
//SOMX = "Soma indexada": Add a value from a given indexed memory position into the accumulator
value = (opcode & 0x0F) << 8 | READ_BYTE_PATINHO(PC);
tmp = (opcode & 0x0F) << 8 | READ_BYTE_PATINHO(PC);
INCREMENT_PC_4K;
m_idx = READ_INDEX_REG();
addr = compute_effective_address(m_idx + value);
addr = compute_effective_address(m_idx + tmp);
ACC += READ_BYTE_PATINHO(addr);
//TODO: update V and T flags
return;
case 0xA0:
//PLAN = "Pula se ACC negativo": Jump to a given address if ACC is negative
addr = compute_effective_address((opcode & 0x0F) << 8 | READ_BYTE_PATINHO(PC));
INCREMENT_PC_4K;
if ((signed char) ACC < 0)
PC = addr;
return;
case 0xB0:
//PLAZ = "Pula se ACC for zero": Jump to a given address if ACC is zero
addr = compute_effective_address((opcode & 0x0F) << 8 | READ_BYTE_PATINHO(PC));
INCREMENT_PC_4K;
if (ACC == 0)
PC = addr;
return;
case 0xF0:
//PUG = "Pula e guarda": Jump and store.
// It stores the return address to addr and addr+1