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bbc_tube_casper: VIA interface is enabled on address A4.

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This commit is contained in:
Nigel Barnes 2021-02-20 18:30:33 +00:00
parent fe48c0296b
commit b8055d9852
2 changed files with 20 additions and 19 deletions
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34
src/devices/bus/bbc/tube/tube_casper.cpp
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@ -26,7 +26,7 @@ DEFINE_DEVICE_TYPE(BBC_TUBE_CASPER, bbc_tube_casper_device, "bbc_tube_casper", "
void bbc_tube_casper_device::tube_casper_mem(address_map &map)
{
map(0x00000, 0x03fff).rom().region("casper_rom", 0);
map(0x10000, 0x1001f).m("via6522_1", FUNC(via6522_device::map)).umask16(0x00ff);
map(0x10000, 0x1001f).m(m_via[1], FUNC(via6522_device::map)).umask16(0x00ff);
map(0x20000, 0x3ffff).ram();
}
@ -53,19 +53,18 @@ void bbc_tube_casper_device::device_add_mconfig(machine_config &config)
M68000(config, m_m68000, 4_MHz_XTAL);
m_m68000->set_addrmap(AS_PROGRAM, &bbc_tube_casper_device::tube_casper_mem);
MOS6522(config, m_via6522_0, 4_MHz_XTAL / 2);
m_via6522_0->writepb_handler().set(m_via6522_1, FUNC(via6522_device::write_pa));
m_via6522_0->ca2_handler().set(m_via6522_1, FUNC(via6522_device::write_cb1));
m_via6522_0->cb2_handler().set(m_via6522_1, FUNC(via6522_device::write_ca1));
m_via6522_0->irq_handler().set(DEVICE_SELF_OWNER, FUNC(bbc_tube_slot_device::irq_w));
MOS6522(config, m_via[0], 4_MHz_XTAL / 2);
m_via[0]->writepb_handler().set(m_via[1], FUNC(via6522_device::write_pa));
m_via[0]->ca2_handler().set(m_via[1], FUNC(via6522_device::write_cb1));
m_via[0]->cb2_handler().set(m_via[1], FUNC(via6522_device::write_ca1));
m_via[0]->irq_handler().set(DEVICE_SELF_OWNER, FUNC(bbc_tube_slot_device::irq_w));
MOS6522(config, m_via6522_1, 4_MHz_XTAL / 2);
m_via6522_1->writepb_handler().set(m_via6522_0, FUNC(via6522_device::write_pa));
m_via6522_1->ca2_handler().set(m_via6522_0, FUNC(via6522_device::write_cb1));
m_via6522_1->cb2_handler().set(m_via6522_0, FUNC(via6522_device::write_ca1));
m_via6522_1->irq_handler().set_inputline(m_m68000, M68K_IRQ_1);
MOS6522(config, m_via[1], 4_MHz_XTAL / 2);
m_via[1]->writepb_handler().set(m_via[0], FUNC(via6522_device::write_pa));
m_via[1]->ca2_handler().set(m_via[0], FUNC(via6522_device::write_cb1));
m_via[1]->cb2_handler().set(m_via[0], FUNC(via6522_device::write_ca1));
m_via[1]->irq_handler().set_inputline(m_m68000, M68K_IRQ_1);
/* software lists */
SOFTWARE_LIST(config, "flop_ls_casper").set_original("bbc_flop_68000");
}
@ -90,8 +89,7 @@ bbc_tube_casper_device::bbc_tube_casper_device(const machine_config &mconfig, co
: device_t(mconfig, BBC_TUBE_CASPER, tag, owner, clock),
device_bbc_tube_interface(mconfig, *this),
m_m68000(*this, "m68000"),
m_via6522_0(*this, "via6522_0"),
m_via6522_1(*this, "via6522_1"),
m_via(*this, "via%u", 0),
m_casper_rom(*this, "casper_rom")
{
}
@ -111,10 +109,14 @@ void bbc_tube_casper_device::device_start()
uint8_t bbc_tube_casper_device::host_r(offs_t offset)
{
return m_via6522_0->read(offset & 0xf);
if (offset & 0x10)
return m_via[0]->read(offset & 0xf);
else
return 0xfe;
}
void bbc_tube_casper_device::host_w(offs_t offset, uint8_t data)
{
m_via6522_0->write(offset & 0xf, data);
if (offset & 0x10)
m_via[0]->write(offset & 0xf, data);
}

5
src/devices/bus/bbc/tube/tube_casper.h
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@ -40,9 +40,8 @@ protected:
virtual void host_w(offs_t offset, uint8_t data) override;
private:
required_device<cpu_device> m_m68000;
required_device<via6522_device> m_via6522_0;
required_device<via6522_device> m_via6522_1;
required_device<m68000_base_device> m_m68000;
required_device_array<via6522_device, 2> m_via;
required_memory_region m_casper_rom;
void tube_casper_mem(address_map &map);