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Added general read/write methods to 9928a, allowing address lines to select functions

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This commit is contained in:
Michael Zapf 2016-04-20 00:23:28 +02:00
parent c7aeff7d6d
commit 9eb11bdec7
3 changed files with 24 additions and 22 deletions
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24
src/devices/bus/ti99x/datamux.cpp
View File

@ -125,17 +125,7 @@ void ti99_datamux_device::read_all(address_space& space, UINT16 addr, UINT8 *val
if ((addr & 0xf801)==0x8800)
{
// Forward to VDP unless we have an EVPC
if (m_video != nullptr)
{
if ((addr & 2) != 0)
{ // read VDP status
*value = m_video->register_read(space, 0);
}
else
{ // read VDP RAM
*value = m_video->vram_read(space, 0);
}
}
if (m_video != nullptr) *value = m_video->read(space, addr>>1); // A14 determines data or register read
}
}
@ -174,17 +164,7 @@ void ti99_datamux_device::write_all(address_space& space, UINT16 addr, UINT8 val
if ((addr & 0xf801)==0x8800)
{
// Forward to VDP unless we have an EVPC
if (m_video != nullptr)
{
if ((addr & 2) != 0)
{ // write VDP address/register
m_video->register_write(space, 0, value);
}
else
{ // write VDP data
m_video->vram_write(space, 0, value);
}
}
if (m_video != nullptr) m_video->write(space, addr>>1, value); // A14 determines data or register write
}
// PEB gets all accesses

19
src/devices/video/tms9928a.cpp
View File

@ -112,6 +112,25 @@ tms9929a_device::tms9929a_device(const machine_config &mconfig, const char *tag,
: tms9928a_device( mconfig, TMS9929A, "TMS9929A", tag, owner, clock, true, true, true, "tms9929a", __FILE__)
{ }
READ8_MEMBER( tms9928a_device::read )
{
UINT8 value = 0;
if ((offset & 1) == 0)
value = vram_read(space, 0);
else
value = register_read(space, 0);
return value;
}
WRITE8_MEMBER( tms9928a_device::write )
{
if ((offset & 1) == 0)
vram_write(space, 0, data);
else
register_write(space, 0, data);
}
READ8_MEMBER( tms9928a_device::vram_read )
{

3
src/devices/video/tms9928a.h
View File

@ -92,6 +92,9 @@ public:
template<class _Object> static devcb_base &set_out_int_line_callback(device_t &device, _Object object) { return downcast<tms9928a_device &>(device).m_out_int_line_cb.set_callback(object); }
template<class _Object> static devcb_base &set_out_gromclk_callback(device_t &device, _Object object) { return downcast<tms9928a_device &>(device).m_out_gromclk_cb.set_callback(object); }
DECLARE_READ8_MEMBER( read );
DECLARE_WRITE8_MEMBER( write );
DECLARE_READ8_MEMBER( vram_read );
DECLARE_WRITE8_MEMBER( vram_write );
DECLARE_READ8_MEMBER( register_read );