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pps4: fixed bug with lb/lbl commands.

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This commit is contained in:
Robbbert 2022-05-25 12:17:05 +10:00
parent 5a36d6f358
commit f383ae926d
2 changed files with 20 additions and 17 deletions
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36
src/devices/cpu/pps4/pps4.cpp
View File

@ -95,6 +95,7 @@ pps4_device::pps4_device(const machine_config &mconfig, device_type type, const
, m_dib_cb(*this) , m_dib_cb(*this)
, m_do_cb(*this) , m_do_cb(*this)
, m_wasldi(0) , m_wasldi(0)
, m_waslbl(0)
{ {
} }
@ -855,18 +856,17 @@ void pps4_device::iCYS()
*/ */
void pps4_device::iLB() void pps4_device::iLB()
{ {
// previous LB or LBL instruction? if (!m_waslbl)
if (0xc0 == (m_Ip & 0xf0) || 0x00 == m_Ip) { {
LOG("%s: skip prev:%02x op:%02x\n", __FUNCTION__, m_Ip, m_I1); m_SB = m_SA;
return; m_SA = (m_P + 1) & 0xFFF;
m_P = (3 << 6) | (m_I1 & 15);
m_B = ~ARG() & 255;
m_P = m_SA;
// swap SA and SB
std::swap(m_SA, m_SB);
} }
m_SB = m_SA; m_waslbl = 2;
m_SA = (m_P + 1) & 0xFFF;
m_P = (3 << 6) | (m_I1 & 15);
m_B = ~ARG() & 255;
m_P = m_SA;
// swap SA and SB
std::swap(m_SA, m_SB);
} }
/** /**
@ -895,12 +895,10 @@ void pps4_device::iLB()
void pps4_device::iLBL() void pps4_device::iLBL()
{ {
m_I2 = ARG(); m_I2 = ARG();
// previous LB or LBL instruction? if (!m_waslbl)
if (0xc0 == (m_Ip & 0xf0) || 0x00 == m_Ip) { m_B = ~m_I2 & 255; // Note: immediate is 1's complement
LOG("%s: skip prev:%02x op:%02x\n", __FUNCTION__, m_Ip, m_I1);
return; m_waslbl = 2;
}
m_B = ~m_I2 & 255; // Note: immediate is 1's complement
} }
/** /**
@ -1327,6 +1325,8 @@ void pps4_device::execute_one()
m_I1 = ROP(); m_I1 = ROP();
if (m_wasldi) if (m_wasldi)
m_wasldi--; m_wasldi--;
if (m_waslbl)
m_waslbl--;
if (m_Skip) { if (m_Skip) {
m_Skip = 0; m_Skip = 0;
LOG("%s: skip op:%02x\n", __FUNCTION__, m_I1); LOG("%s: skip op:%02x\n", __FUNCTION__, m_I1);
@ -1635,6 +1635,8 @@ void pps4_device::device_reset()
m_I1 = 0; // Most recent instruction I(8:1) m_I1 = 0; // Most recent instruction I(8:1)
m_I2 = 0; // Most recent parameter I2(8:1) m_I2 = 0; // Most recent parameter I2(8:1)
m_Ip = 0; // Previous instruction I(8:1) m_Ip = 0; // Previous instruction I(8:1)
m_wasldi = 0;
m_waslbl = 0;
} }
void pps4_2_device::device_reset() void pps4_2_device::device_reset()

1
src/devices/cpu/pps4/pps4.h
View File

@ -85,6 +85,7 @@ protected:
memory_access< 8, 0, 0, ENDIANNESS_LITTLE>::specific m_io; memory_access< 8, 0, 0, ENDIANNESS_LITTLE>::specific m_io;
int m_icount; int m_icount;
int m_wasldi; int m_wasldi;
int m_waslbl;
u8 m_A; //!< Accumulator A(4:1) u8 m_A; //!< Accumulator A(4:1)
u8 m_X; //!< X register X(4:1) u8 m_X; //!< X register X(4:1)