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spc1000_fdd_exp: General cleanup; correct XTAL value

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This commit is contained in:
AJR 2020-11-27 19:29:03 -05:00
parent 6a2a743e21
commit 584cca5a97
2 changed files with 21 additions and 33 deletions
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47
src/devices/bus/spc1000/fdd.cpp
View File

@ -52,17 +52,19 @@ void spc1000_fdd_exp_device::control_w(uint8_t data)
logerror("%s: control_w(%02x)\n", machine().describe_context(), data);
// bit 0, motor on signal
if (m_fd0)
m_fd0->mon_w(!BIT(data, 0));
if (m_fd1)
m_fd1->mon_w(!BIT(data, 0));
for (auto &fd : m_fd)
{
floppy_image_device *img = fd->get_device();
if (img)
img->mon_w(!BIT(data, 0));
}
}
void spc1000_fdd_exp_device::sd725_mem(address_map &map)
{
map.unmap_value_high();
map(0x0000, 0x1fff).rom();
map(0x2000, 0xffff).ram();
map(0x0000, 0x0fff).rom().region("fdccpu", 0);
map(0x4000, 0x7fff).ram(); // 16K dynamic RAM (2x TMS4416-15NL)
}
void spc1000_fdd_exp_device::sd725_io(address_map &map)
@ -80,15 +82,16 @@ static void sd725_floppies(device_slot_interface &device)
}
//-------------------------------------------------
// device_add_mconfig
// device_add_mconfigfloppy_image
//-------------------------------------------------
void spc1000_fdd_exp_device::device_add_mconfig(machine_config &config)
{
// sub CPU (5 inch floppy drive)
Z80(config, m_cpu, XTAL(4'000'000));
// Z80A sub CPU (5 inch floppy drive)
Z80(config, m_cpu, 8_MHz_XTAL / 2);
m_cpu->set_addrmap(AS_PROGRAM, &spc1000_fdd_exp_device::sd725_mem);
m_cpu->set_addrmap(AS_IO, &spc1000_fdd_exp_device::sd725_io);
m_cpu->set_irq_acknowledge_callback(NAME([](device_t &, int) { return 0xcf; })); // vector to 0008 in IM 0
I8255(config, m_ppi);
m_ppi->in_pa_callback().set(m_ppi, FUNC(i8255_device::pb_r));
@ -98,7 +101,7 @@ void spc1000_fdd_exp_device::device_add_mconfig(machine_config &config)
m_ppi->out_pc_callback().set(FUNC(spc1000_fdd_exp_device::i8255_c_w));
// floppy disk controller
UPD765A(config, m_fdc, 4'000'000, true, true);
UPD765A(config, m_fdc, 8_MHz_XTAL / 2, true, true);
m_fdc->intrq_wr_callback().set_inputline(m_cpu, INPUT_LINE_IRQ0);
// floppy drives
@ -107,7 +110,7 @@ void spc1000_fdd_exp_device::device_add_mconfig(machine_config &config)
}
ROM_START( spc1000_fdd )
ROM_REGION(0x10000, "fdccpu", 0)
ROM_REGION(0x1000, "fdccpu", 0)
ROM_LOAD("sd725a.bin", 0x0000, 0x1000, CRC(96ac2eb8) SHA1(8e9d8f63a7fb87af417e95603e71cf537a6e83f1))
ROM_END
@ -141,7 +144,8 @@ spc1000_fdd_exp_device::spc1000_fdd_exp_device(const machine_config &mconfig, co
m_cpu(*this, "fdccpu"),
m_fdc(*this, "upd765"),
m_ppi(*this, "d8255_master"),
m_fd0(nullptr), m_fd1(nullptr), m_timer_tc(nullptr), m_i8255_0_pc(0), m_i8255_1_pc(0), m_i8255_portb(0)
m_fd(*this, "upd765:%u", 0U),
m_timer_tc(nullptr), m_i8255_0_pc(0), m_i8255_1_pc(0), m_i8255_portb(0)
{
}
@ -152,11 +156,7 @@ spc1000_fdd_exp_device::spc1000_fdd_exp_device(const machine_config &mconfig, co
void spc1000_fdd_exp_device::device_start()
{
m_timer_tc = timer_alloc(TIMER_TC);
m_timer_tc->adjust(attotime::never);
m_fd0 = subdevice<floppy_connector>("upd765:0")->get_device();
m_fd1 = subdevice<floppy_connector>("upd765:1")->get_device();
m_timer_tc = machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(spc1000_fdd_exp_device::tc_off), this));
}
//-------------------------------------------------
@ -165,20 +165,11 @@ void spc1000_fdd_exp_device::device_start()
void spc1000_fdd_exp_device::device_reset()
{
m_cpu->set_input_line_vector(0, 0); // Z80
// enable rom (is this really needed? it does not seem necessary for FDD to work)
m_cpu->space(AS_PROGRAM).install_rom(0x0000, 0x0fff, 0x2000, memregion("fdccpu")->base());
}
void spc1000_fdd_exp_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
TIMER_CALLBACK_MEMBER(spc1000_fdd_exp_device::tc_off)
{
switch (id)
{
case TIMER_TC:
m_fdc->tc_w(false);
break;
}
m_fdc->tc_w(false);
}
/*-------------------------------------------------

7
src/devices/bus/spc1000/fdd.h
View File

@ -29,21 +29,18 @@ protected:
virtual void device_reset() override;
virtual void device_add_mconfig(machine_config &config) override;
virtual const tiny_rom_entry *device_rom_region() const override;
virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override;
virtual uint8_t read(offs_t offset) override;
virtual void write(offs_t offset, uint8_t data) override;
private:
static constexpr device_timer_id TIMER_TC = 0;
TIMER_CALLBACK_MEMBER(tc_off);
// internal state
required_device<z80_device> m_cpu;
required_device<upd765a_device> m_fdc;
required_device<i8255_device> m_ppi;
floppy_image_device *m_fd0;
floppy_image_device *m_fd1;
required_device_array<floppy_connector, 2> m_fd;
emu_timer *m_timer_tc;