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dialog80: RAM test now passes (nw)

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This commit is contained in:
AJR 2018-02-11 16:27:19 -05:00
parent 2206d59a48
commit 7f4b04e28a
1 changed files with 43 additions and 3 deletions
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46
src/mame/drivers/ampex.cpp
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@ -48,6 +48,9 @@ public:
DECLARE_READ8_MEMBER(read_5846);
DECLARE_READ8_MEMBER(read_5847);
DECLARE_READ8_MEMBER(page_r);
DECLARE_WRITE8_MEMBER(page_w);
DECLARE_WRITE_LINE_MEMBER(vsyn_w);
DECLARE_WRITE8_MEMBER(uart_status_update);
@ -55,6 +58,11 @@ public:
private:
virtual void machine_start() override;
u8 m_page;
u8 m_attr;
bool m_attr_readback;
std::unique_ptr<u16[]> m_paged_ram;
required_device<cpu_device> m_maincpu;
required_device<ay31015_device> m_uart;
required_region_ptr<u8> m_p_chargen;
@ -73,18 +81,26 @@ READ8_MEMBER(ampex_state::read_5840)
WRITE8_MEMBER(ampex_state::write_5840)
{
m_page = (data & 0x30) >> 4;
logerror("%s: Write %02X to 5840\n", machine().describe_context(), data);
}
READ8_MEMBER(ampex_state::read_5841)
{
logerror("%s: Read from 5841\n", machine().describe_context());
return m_uart->get_output_pin(AY31015_DAV) << 3;
u8 result = m_uart->get_output_pin(AY31015_DAV) << 3;
result |= m_uart->get_output_pin(AY31015_OR) << 4;
result |= m_uart->get_output_pin(AY31015_PE) << 5;
result |= m_uart->get_output_pin(AY31015_FE) << 6;
return result;
}
WRITE8_MEMBER(ampex_state::write_5841)
{
//logerror("%s: Write %02X to 5841\n", machine().describe_context(), data);
// bit 7 set for UART loopback test
m_attr_readback = BIT(data, 5);
}
READ8_MEMBER(ampex_state::read_5842)
@ -109,6 +125,7 @@ READ8_MEMBER(ampex_state::read_5843)
WRITE8_MEMBER(ampex_state::write_5843)
{
logerror("%s: Write %02X to 5843\n", machine().describe_context(), data);
m_attr = (data & 0x78) >> 3;
}
READ8_MEMBER(ampex_state::read_5846)
@ -123,6 +140,19 @@ READ8_MEMBER(ampex_state::read_5847)
return 0;
}
READ8_MEMBER(ampex_state::page_r)
{
if (m_attr_readback)
return 0x87 | m_paged_ram[m_page * 0x1800 + offset] >> 5;
else
return 0xff & m_paged_ram[m_page * 0x1800 + offset];
}
WRITE8_MEMBER(ampex_state::page_w)
{
m_paged_ram[m_page * 0x1800 + offset] = data | m_attr << 8;
}
WRITE_LINE_MEMBER(ampex_state::vsyn_w)
{
// should generate RST 6 interrupt
@ -144,7 +174,7 @@ static ADDRESS_MAP_START( mem_map, AS_PROGRAM, 8, ampex_state )
AM_RANGE(0x5846, 0x5846) AM_READ(read_5846)
AM_RANGE(0x5847, 0x5847) AM_READ(read_5847)
AM_RANGE(0x5c00, 0x5c0f) AM_DEVREADWRITE("vtac", crt5037_device, read, write)
AM_RANGE(0x8000, 0x9fff) AM_RAM
AM_RANGE(0x8000, 0x97ff) AM_READWRITE(page_r, page_w)
AM_RANGE(0xc000, 0xcfff) AM_RAM // video RAM
ADDRESS_MAP_END
@ -153,7 +183,17 @@ INPUT_PORTS_END
void ampex_state::machine_start()
{
m_page = 0;
m_attr = 0;
m_attr_readback = false;
m_paged_ram = std::make_unique<u16[]>(0x1800 * 4);
m_uart->set_input_pin(AY31015_SWE, 0);
save_item(NAME(m_page));
save_item(NAME(m_attr));
save_item(NAME(m_attr_readback));
save_pointer(NAME(m_paged_ram.get()), 0x1800 * 4);
}
MACHINE_CONFIG_START(ampex_state::ampex)