Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-07-01 08:18:59 +03:00
Code Issues Actions Packages Projects Releases Wiki Activity

pps4: fixed bug with lb/lbl commands.

Browse Source
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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_do_cb(*this)
, m_wasldi(0)
, m_waslbl(0)
{
}
@ -855,18 +856,17 @@ void pps4_device::iCYS()
*/
void pps4_device::iLB()
{
// previous LB or LBL instruction?
if (0xc0 == (m_Ip & 0xf0) || 0x00 == m_Ip) {
LOG("%s: skip prev:%02x op:%02x\n", __FUNCTION__, m_Ip, m_I1);
return;
if (!m_waslbl)
{
m_SB = m_SA;
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_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_waslbl = 2;
}
/**
@ -895,12 +895,10 @@ void pps4_device::iLB()
void pps4_device::iLBL()
{
m_I2 = ARG();
// previous LB or LBL instruction?
if (0xc0 == (m_Ip & 0xf0) || 0x00 == m_Ip) {
LOG("%s: skip prev:%02x op:%02x\n", __FUNCTION__, m_Ip, m_I1);
return;
}
m_B = ~m_I2 & 255; // Note: immediate is 1's complement
if (!m_waslbl)
m_B = ~m_I2 & 255; // Note: immediate is 1's complement
m_waslbl = 2;
}
/**
@ -1327,6 +1325,8 @@ void pps4_device::execute_one()
m_I1 = ROP();
if (m_wasldi)
m_wasldi--;
if (m_waslbl)
m_waslbl--;
if (m_Skip) {
m_Skip = 0;
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_I2 = 0; // Most recent parameter I2(8:1)
m_Ip = 0; // Previous instruction I(8:1)
m_wasldi = 0;
m_waslbl = 0;
}
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;
int m_icount;
int m_wasldi;
int m_waslbl;
u8 m_A; //!< Accumulator A(4:1)
u8 m_X; //!< X register X(4:1)