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nsc810: Implemented port bit set/clear.

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This commit is contained in:
Nigel Barnes 2019-08-22 03:08:50 +01:00
parent d789c5dcf8
commit c60df8627f
1 changed files with 26 additions and 7 deletions
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33
src/devices/machine/nsc810.cpp
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@ -8,7 +8,6 @@
* TODO:
* - 128 byte RAM
* - other timer modes (only mode 1 - event counter - is implemented currently)
* - port bit set/clear
* - and lots of other stuff
*/
@ -232,25 +231,45 @@ void nsc810_device::write(offs_t offset, uint8_t data)
LOG("NSC810: Port C direction write %02x\n",data);
break;
case REG_MODE_DEF:
if ((data & 0x01) == 0x00)
m_mode = 0;
else if ((data & 0x03) == 0x01)
m_mode = 1;
else if ((data & 0x07) == 0x03)
m_mode = 2;
else if ((data & 0x07) == 0x07)
m_mode = 3;
LOG("NSC810: Mode Definition write %02x\n",data);
break;
case REG_PORTA_BITCLR:
LOG("NSC810: Port A bit-clear write %02x\n",data);
m_portA_latch &= ~data;
m_portA_w((0xff & ~m_ddrA) | (m_portA_latch & m_ddrA));
LOG("NSC810: Port A bit-clear write %02x (PA=%02x)\n",data,m_portA_latch);
break;
case REG_PORTB_BITCLR:
LOG("NSC810: Port B bit-clear write %02x\n",data);
m_portB_latch &= ~data;
m_portB_w((0xff & ~m_ddrB) | (m_portB_latch & m_ddrB));
LOG("NSC810: Port B bit-clear write %02x (PB=%02x)\n",data,m_portB_latch);
break;
case REG_PORTC_BITCLR:
LOG("NSC810: Port C bit-clear write %02x\n",data);
m_portC_latch &= ~data;
m_portC_w((0xff & ~m_ddrC) | (m_portC_latch & m_ddrC));
LOG("NSC810: Port C bit-clear write %02x (PC=%02x)\n",data,m_portC_latch);
break;
case REG_PORTA_BITSET:
LOG("NSC810: Port A bit-set write %02x\n",data);
m_portA_latch |= data;
m_portA_w((0xff & ~m_ddrA) | (m_portA_latch & m_ddrA));
LOG("NSC810: Port A bit-set write %02x (PA=%02x)\n",data,m_portA_latch);
break;
case REG_PORTB_BITSET:
LOG("NSC810: Port B bit-set write %02x\n",data);
m_portB_latch |= data;
m_portB_w((0xff & ~m_ddrB) | (m_portB_latch & m_ddrB));
LOG("NSC810: Port B bit-set write %02x (PB=%02x)\n",data,m_portB_latch);
break;
case REG_PORTC_BITSET:
LOG("NSC810: Port C bit-set write %02x\n",data);
m_portC_latch |= data;
m_portC_w((0xff & ~m_ddrC) | (m_portC_latch & m_ddrC));
LOG("NSC810: Port C bit-set write %02x (PC=%02x)\n",data,m_portC_latch);
break;
case REG_TIMER0_LOW:
m_timer0_base = (m_timer0_base & 0xff00) | data;