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mb88xx: mask ram r/w and read_r to 4-bit

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This commit is contained in:
hap 2022-05-04 15:15:30 +02:00
parent eb5f919366
commit 9b07129f5a
2 changed files with 10 additions and 14 deletions
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23
src/devices/cpu/mb88xx/mb88xx.cpp
View File

@ -2,7 +2,7 @@
// copyright-holders:Ernesto Corvi
/***************************************************************************
mb88xx.c
mb88xx.cpp
Core implementation for the portable Fujitsu MB88xx series MCU emulator.
Written by Ernesto Corvi
@ -48,8 +48,8 @@ DEFINE_DEVICE_TYPE(MB8844, mb8844_cpu_device, "mb8844", "Fujitsu MB8844")
#define READOP(a) (m_cache.read_byte(a))
#define RDMEM(a) (m_data.read_byte(a))
#define WRMEM(a,v) (m_data.write_byte((a), (v)))
#define RDMEM(a) (m_data.read_byte(a) & 0x0f)
#define WRMEM(a,v) (m_data.write_byte((a), (v) & 0x0f))
#define TEST_ST() (m_st & 1)
#define TEST_ZF() (m_zf & 1)
@ -199,10 +199,7 @@ void mb88_cpu_device::device_start()
save_item(NAME(m_PC));
save_item(NAME(m_PA));
save_item(NAME(m_SP[0]));
save_item(NAME(m_SP[1]));
save_item(NAME(m_SP[2]));
save_item(NAME(m_SP[3]));
save_item(NAME(m_SP));
save_item(NAME(m_SI));
save_item(NAME(m_A));
save_item(NAME(m_X));
@ -707,7 +704,7 @@ void mb88_cpu_device::execute_run()
break;
case 0x20: /* setR ZCS:... */
arg = m_read_r[m_Y/4]();
arg = m_read_r[m_Y/4]() & 0x0f;
m_write_r[m_Y/4](arg | (1 << (m_Y%4)));
m_st = 1;
break;
@ -718,7 +715,7 @@ void mb88_cpu_device::execute_run()
break;
case 0x22: /* rstR ZCS:... */
arg = m_read_r[m_Y/4]();
arg = m_read_r[m_Y/4]() & 0x0f;
m_write_r[m_Y/4](arg & ~(1 << (m_Y%4)));
m_st = 1;
break;
@ -729,7 +726,7 @@ void mb88_cpu_device::execute_run()
break;
case 0x24: /* tstr ZCS:..x */
arg = m_read_r[m_Y/4]();
arg = m_read_r[m_Y/4]() & 0x0f;
m_st = ( arg & ( 1 << (m_Y%4) ) ) ? 0 : 1;
break;
@ -851,21 +848,21 @@ void mb88_cpu_device::execute_run()
break;
case 0x40: case 0x41: case 0x42: case 0x43: /* setD ZCS:... */
arg = m_read_r[0]();
arg = m_read_r[0]() & 0x0f;
arg |= (1 << (opcode&3));
m_write_r[0](arg);
m_st = 1;
break;
case 0x44: case 0x45: case 0x46: case 0x47: /* rstD ZCS:... */
arg = m_read_r[0]();
arg = m_read_r[0]() & 0x0f;
arg &= ~(1 << (opcode&3));
m_write_r[0](arg);
m_st = 1;
break;
case 0x48: case 0x49: case 0x4a: case 0x4b: /* tstD ZCS:..x */
arg = m_read_r[2]();
arg = m_read_r[2]() & 0x0f;
m_st = (arg & (1 << (opcode&3))) ? 0 : 1;
break;

1
src/devices/cpu/mb88xx/mb88xx.h
View File

@ -192,7 +192,6 @@ private:
void update_pio_enable( uint8_t newpio );
void increment_timer();
void update_pio( int cycles );
};