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decodmd1: Add addressable latch device (nw)

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This commit is contained in:
AJR 2017-07-27 00:00:01 -04:00
parent ea7bc5dd72
commit 4a05d05fbd
2 changed files with 50 additions and 40 deletions
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82
src/mame/video/decodmd1.cpp
View File

@ -40,7 +40,6 @@ WRITE8_MEMBER( decodmd_type1_device::ctrl_w )
if((m_ctrl & 0x02) && !(data & 0x02)) if((m_ctrl & 0x02) && !(data & 0x02))
{ {
m_rombank1->set_entry(0); m_rombank1->set_entry(0);
m_bank = 0;
set_busy(B_SET,0); set_busy(B_SET,0);
m_rowselect = 0; m_rowselect = 0;
m_blank = 0; m_blank = 0;
@ -102,44 +101,40 @@ WRITE8_MEMBER( decodmd_type1_device::dmd_port_w )
break; break;
case 0x84: case 0x84:
bit = data & 0x01; bit = data & 0x01;
switch(offset & 0xdc) m_bitlatch->write_bit((offset & 0x40) >> 4 | (offset & 0x18) >> 3, bit);
{
case 0x84: // Bank bit 0
m_bank = (m_bank & ~0x01) | (~bit & 0x01);
m_rombank1->set_entry(m_bank);
break;
case 0x8c: // Bank bit 1
m_bank = (m_bank & ~0x02) | ((~bit & 0x01) << 1);
m_rombank1->set_entry(m_bank);
break;
case 0x94: // Bank bit 2
m_bank = (m_bank & ~0x04) | ((~bit & 0x01) << 2);
m_rombank1->set_entry(m_bank);
break;
case 0x9c: // Blanking
m_blank = bit;
if(bit)
output_data();
break;
case 0xc4: // Status
m_status = bit;
break;
case 0xcc: // Row data
m_rowdata = bit;
break;
case 0xd4: // Row clock
if(~bit & m_rowclock) // on negative edge
m_rowselect = (m_rowselect << 1) | m_rowdata;
m_rowclock = bit;
break;
case 0xdc: // Test
set_busy(B_SET,bit);
break;
}
break; break;
} }
} }
WRITE_LINE_MEMBER(decodmd_type1_device::blank_w)
{
m_blank = state;
if (state)
output_data();
}
WRITE_LINE_MEMBER(decodmd_type1_device::status_w)
{
m_status = state;
}
WRITE_LINE_MEMBER(decodmd_type1_device::rowdata_w)
{
m_rowdata = state;
}
WRITE_LINE_MEMBER(decodmd_type1_device::rowclock_w)
{
if (!state & m_rowclock) // on negative edge
m_rowselect = (m_rowselect << 1) | m_rowdata;
m_rowclock = state;
}
WRITE_LINE_MEMBER(decodmd_type1_device::test_w)
{
set_busy(B_SET, state);
}
void decodmd_type1_device::output_data() void decodmd_type1_device::output_data()
{ {
uint8_t ptr = 0; uint8_t ptr = 0;
@ -225,15 +220,23 @@ MACHINE_CONFIG_MEMBER( decodmd_type1_device::device_add_mconfig )
MCFG_RAM_ADD(RAM_TAG) MCFG_RAM_ADD(RAM_TAG)
MCFG_RAM_DEFAULT_SIZE("8K") MCFG_RAM_DEFAULT_SIZE("8K")
MCFG_DEVICE_ADD("bitlatch", HC259, 0) // U4
MCFG_ADDRESSABLE_LATCH_PARALLEL_OUT_CB(MEMBANK("dmdbank1")) MCFG_DEVCB_MASK(0x07) MCFG_DEVCB_INVERT
MCFG_ADDRESSABLE_LATCH_Q3_OUT_CB(WRITELINE(decodmd_type1_device, blank_w))
MCFG_ADDRESSABLE_LATCH_Q4_OUT_CB(WRITELINE(decodmd_type1_device, status_w))
MCFG_ADDRESSABLE_LATCH_Q5_OUT_CB(WRITELINE(decodmd_type1_device, rowdata_w))
MCFG_ADDRESSABLE_LATCH_Q6_OUT_CB(WRITELINE(decodmd_type1_device, rowclock_w))
MCFG_ADDRESSABLE_LATCH_Q7_OUT_CB(WRITELINE(decodmd_type1_device, test_w))
MACHINE_CONFIG_END MACHINE_CONFIG_END
decodmd_type1_device::decodmd_type1_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) decodmd_type1_device::decodmd_type1_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: device_t(mconfig, DECODMD1, tag, owner, clock), : device_t(mconfig, DECODMD1, tag, owner, clock),
m_cpu(*this,"dmdcpu"), m_cpu(*this, "dmdcpu"),
m_rombank1(*this,"dmdbank1"), m_rombank1(*this, "dmdbank1"),
m_rombank2(*this,"dmdbank2"), m_rombank2(*this, "dmdbank2"),
m_ram(*this,RAM_TAG) m_ram(*this, RAM_TAG),
m_bitlatch(*this, "bitlatch")
{} {}
void decodmd_type1_device::device_start() void decodmd_type1_device::device_start()
@ -256,7 +259,6 @@ void decodmd_type1_device::device_reset()
m_rombank1->set_entry(0); m_rombank1->set_entry(0);
m_rombank2->set_entry(0); m_rombank2->set_entry(0);
m_status = 0; m_status = 0;
m_bank = 0;
m_busy = 0; m_busy = 0;
set_busy(B_CLR|B_SET,0); set_busy(B_CLR|B_SET,0);
m_rowselect = 0; m_rowselect = 0;

8
src/mame/video/decodmd1.h
View File

@ -10,6 +10,7 @@
#pragma once #pragma once
#include "cpu/z80/z80.h" #include "cpu/z80/z80.h"
#include "machine/74259.h"
#include "machine/ram.h" #include "machine/ram.h"
#define MCFG_DECODMD_TYPE1_ADD(_tag, _region) \ #define MCFG_DECODMD_TYPE1_ADD(_tag, _region) \
@ -24,6 +25,7 @@ public:
required_memory_bank m_rombank1; required_memory_bank m_rombank1;
required_memory_bank m_rombank2; required_memory_bank m_rombank2;
required_device<ram_device> m_ram; required_device<ram_device> m_ram;
required_device<hc259_device> m_bitlatch;
memory_region* m_rom; memory_region* m_rom;
DECLARE_READ8_MEMBER(latch_r); DECLARE_READ8_MEMBER(latch_r);
@ -36,6 +38,12 @@ public:
DECLARE_READ8_MEMBER(dmd_port_r); DECLARE_READ8_MEMBER(dmd_port_r);
DECLARE_WRITE8_MEMBER(dmd_port_w); DECLARE_WRITE8_MEMBER(dmd_port_w);
DECLARE_WRITE_LINE_MEMBER(blank_w);
DECLARE_WRITE_LINE_MEMBER(status_w);
DECLARE_WRITE_LINE_MEMBER(rowdata_w);
DECLARE_WRITE_LINE_MEMBER(rowclock_w);
DECLARE_WRITE_LINE_MEMBER(test_w);
static void static_set_gfxregion(device_t &device, const char *tag); static void static_set_gfxregion(device_t &device, const char *tag);
protected: protected: