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isbc8630: Add 74LS259 "status register" (only partly implemented)

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This commit is contained in:
AJR 2017-07-30 21:47:26 -04:00
parent bf7704122c
commit 25e6589df6
1 changed files with 79 additions and 0 deletions
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79
src/mame/drivers/isbc.cpp
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@ -20,6 +20,7 @@ able to deal with 256byte sectors so fails to load the irmx 512byte sector image
#include "bus/rs232/rs232.h"
#include "cpu/i86/i86.h"
#include "cpu/i86/i286.h"
#include "machine/74259.h"
#include "machine/terminal.h"
#include "machine/pic8259.h"
#include "machine/pit8253.h"
@ -44,6 +45,7 @@ public:
m_pic_1(*this, "pic_1"),
m_centronics(*this, "centronics"),
m_cent_status_in(*this, "cent_status_in"),
m_statuslatch(*this, "statuslatch"),
m_bios(*this, "user1"),
m_biosram(*this, "biosram")
{
@ -57,6 +59,7 @@ public:
optional_device<pic8259_device> m_pic_1;
optional_device<centronics_device> m_centronics;
optional_device<input_buffer_device> m_cent_status_in;
optional_device<ls259_device> m_statuslatch;
optional_memory_region m_bios;
optional_shared_ptr<u16> m_biosram;
@ -70,10 +73,24 @@ public:
DECLARE_WRITE8_MEMBER(upperen_w);
DECLARE_READ16_MEMBER(bioslo_r);
DECLARE_WRITE16_MEMBER(bioslo_w);
DECLARE_WRITE8_MEMBER(edge_intr_clear_w);
DECLARE_WRITE8_MEMBER(status_register_w);
DECLARE_WRITE_LINE_MEMBER(nmi_mask_w);
DECLARE_WRITE_LINE_MEMBER(override_w);
DECLARE_WRITE_LINE_MEMBER(bus_intr_out1_w);
DECLARE_WRITE_LINE_MEMBER(bus_intr_out2_w);
DECLARE_WRITE_LINE_MEMBER(led_ds1_w);
DECLARE_WRITE_LINE_MEMBER(led_ds3_w);
DECLARE_WRITE_LINE_MEMBER(megabyte_select_w);
protected:
void machine_reset() override;
private:
bool m_upperen;
offs_t m_megabyte_page;
bool m_nmi_enable;
bool m_override;
bool m_megabyte_enable;
};
void isbc_state::machine_reset()
@ -86,6 +103,7 @@ void isbc_state::machine_reset()
if(m_uart8251)
m_uart8251->write_cts(0);
m_upperen = false;
m_megabyte_page = 0;
}
static ADDRESS_MAP_START(rpc86_mem, AS_PROGRAM, 16, isbc_state)
@ -116,6 +134,8 @@ static ADDRESS_MAP_START(isbc8605_io, AS_IO, 16, isbc_state)
ADDRESS_MAP_END
static ADDRESS_MAP_START(isbc8630_io, AS_IO, 16, isbc_state)
AM_RANGE(0x00c0, 0x00c7) AM_WRITE8(edge_intr_clear_w, 0xff00)
AM_RANGE(0x00c8, 0x00df) AM_WRITE8(status_register_w, 0xff00)
AM_RANGE(0x0100, 0x0101) AM_DEVWRITE8("isbc_215g", isbc_215g_device, write, 0x00ff)
AM_IMPORT_FROM(rpc86_io)
ADDRESS_MAP_END
@ -258,6 +278,54 @@ WRITE_LINE_MEMBER(isbc_state::isbc_uart8274_irq)
}
#endif
WRITE8_MEMBER(isbc_state::edge_intr_clear_w)
{
// reset U32 flipflop
}
WRITE8_MEMBER(isbc_state::status_register_w)
{
m_megabyte_page = (data & 0xf0) << 16;
m_statuslatch->write_bit(data & 0x07, BIT(data, 3));
}
WRITE_LINE_MEMBER(isbc_state::nmi_mask_w)
{
// combined with NMI input by 74LS08 AND gate at U12
m_nmi_enable = state;
}
WRITE_LINE_MEMBER(isbc_state::override_w)
{
// 1 = access onboard dual-port RAM
m_override = state;
}
WRITE_LINE_MEMBER(isbc_state::bus_intr_out1_w)
{
// Multibus interrupt request (active high)
}
WRITE_LINE_MEMBER(isbc_state::bus_intr_out2_w)
{
// Multibus interrupt request (active high)
}
WRITE_LINE_MEMBER(isbc_state::led_ds1_w)
{
machine().output().set_led_value(0, !state);
}
WRITE_LINE_MEMBER(isbc_state::led_ds3_w)
{
machine().output().set_led_value(1, !state);
}
WRITE_LINE_MEMBER(isbc_state::megabyte_select_w)
{
m_megabyte_enable = !state;
}
static MACHINE_CONFIG_START( isbc86 )
/* basic machine hardware */
MCFG_CPU_ADD("maincpu", I8086, XTAL_5MHz)
@ -345,6 +413,17 @@ static MACHINE_CONFIG_DERIVED( isbc8630, rpc86 )
MCFG_ISBC_215_ADD("isbc_215g", 0x100, "maincpu")
MCFG_ISBC_215_IRQ(DEVWRITELINE("pic_0", pic8259_device, ir5_w))
MCFG_DEVICE_ADD("statuslatch", LS259, 0) // U14
MCFG_ADDRESSABLE_LATCH_Q0_OUT_CB(DEVWRITELINE("pit", pit8253_device, write_gate0))
MCFG_ADDRESSABLE_LATCH_Q1_OUT_CB(DEVWRITELINE("pit", pit8253_device, write_gate1))
MCFG_ADDRESSABLE_LATCH_Q2_OUT_CB(WRITELINE(isbc_state, nmi_mask_w))
MCFG_ADDRESSABLE_LATCH_Q3_OUT_CB(WRITELINE(isbc_state, override_w))
MCFG_ADDRESSABLE_LATCH_Q4_OUT_CB(WRITELINE(isbc_state, bus_intr_out1_w))
MCFG_ADDRESSABLE_LATCH_Q5_OUT_CB(WRITELINE(isbc_state, bus_intr_out2_w))
MCFG_DEVCB_CHAIN_OUTPUT(WRITELINE(isbc_state, led_ds1_w))
MCFG_ADDRESSABLE_LATCH_Q6_OUT_CB(WRITELINE(isbc_state, led_ds3_w))
MCFG_ADDRESSABLE_LATCH_Q7_OUT_CB(WRITELINE(isbc_state, megabyte_select_w))
MACHINE_CONFIG_END
static MACHINE_CONFIG_START( isbc286 )