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apple2: rewrote 16k language card to pass Zellyn/qkumba tests [R. Belmont]

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This commit is contained in:
arbee 2017-02-27 23:43:15 -05:00
parent 3e92c83669
commit f271ad3672
2 changed files with 45 additions and 30 deletions
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71
src/devices/bus/a2bus/ramcard16k.cpp
View File

@ -31,13 +31,13 @@ const device_type A2BUS_RAMCARD16K = device_creator<a2bus_ramcard_device>;
a2bus_ramcard_device::a2bus_ramcard_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, uint32_t clock, const char *shortname, const char *source) :
device_t(mconfig, type, name, tag, owner, clock, shortname, source),
device_a2bus_card_interface(mconfig, *this), m_inh_state(0), m_last_offset(0), m_dxxx_bank(0)
device_a2bus_card_interface(mconfig, *this), m_inh_state(0), m_writecnt(0), m_dxxx_bank(0)
{
}
a2bus_ramcard_device::a2bus_ramcard_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
device_t(mconfig, A2BUS_RAMCARD16K, "Apple II 16K Language Card", tag, owner, clock, "a2ram16k", __FILE__),
device_a2bus_card_interface(mconfig, *this), m_inh_state(0), m_last_offset(0), m_dxxx_bank(0)
device_a2bus_card_interface(mconfig, *this), m_inh_state(0), m_writecnt(0), m_dxxx_bank(0)
{
}
@ -55,48 +55,63 @@ void a2bus_ramcard_device::device_start()
save_item(NAME(m_inh_state));
save_item(NAME(m_ram));
save_item(NAME(m_dxxx_bank));
save_item(NAME(m_last_offset));
save_item(NAME(m_writecnt));
}
void a2bus_ramcard_device::device_reset()
{
m_inh_state = INH_NONE;
m_dxxx_bank = 0;
m_last_offset = -1;
m_writecnt = 0;
}
void a2bus_ramcard_device::do_io(int offset)
void a2bus_ramcard_device::do_io(int offset, bool write)
{
int old_inh_state = m_inh_state;
switch (offset)
{
case 0x1: case 0x3: case 0x9: case 0xb:
if (offset != m_last_offset)
{
m_last_offset = offset;
return;
}
break;
}
m_last_offset = offset;
m_inh_state = INH_NONE;
m_dxxx_bank = 0;
switch (offset)
{
case 0x0: case 0x8: case 0x4: case 0xc:
m_writecnt = 0;
m_inh_state = INH_READ;
break;
case 0x1: case 0x9: case 0x5: case 0xd:
if (write)
{
m_writecnt = 0;
}
else
{
m_writecnt++;
}
break;
if (offset & 0x1)
case 0x2: case 0xa: case 0x6: case 0xe:
m_writecnt = 0;
break;
case 0x3: case 0xb: case 0x7: case 0xf:
if (write)
{
m_writecnt = 0;
}
else
{
m_writecnt++;
}
m_inh_state = INH_READ;
break;
}
if (m_writecnt >= 2)
{
m_inh_state |= INH_WRITE;
}
switch(offset & 0x03)
{
case 0x00:
case 0x03:
m_inh_state |= INH_READ;
break;
}
if (!(offset & 8))
{
m_dxxx_bank = 0x1000;
@ -122,7 +137,7 @@ void a2bus_ramcard_device::do_io(int offset)
uint8_t a2bus_ramcard_device::read_c0nx(address_space &space, uint8_t offset)
{
do_io(offset & 0xf);
do_io(offset & 0xf, false);
return 0xff;
}
@ -133,7 +148,7 @@ uint8_t a2bus_ramcard_device::read_c0nx(address_space &space, uint8_t offset)
void a2bus_ramcard_device::write_c0nx(address_space &space, uint8_t offset, uint8_t data)
{
do_io(offset & 0xf);
do_io(offset & 0xf, true);
}
uint8_t a2bus_ramcard_device::read_inh_rom(address_space &space, uint16_t offset)

4
src/devices/bus/a2bus/ramcard16k.h
View File

@ -40,10 +40,10 @@ protected:
virtual int inh_type() override;
private:
void do_io(int offset);
void do_io(int offset, bool write);
int m_inh_state;
int m_last_offset;
int m_writecnt;
int m_dxxx_bank;
uint8_t m_ram[16*1024];
};