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bus/a2bus/suprterminal.cpp: Allow mapping control via C0Bx reads. (#12876)

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C0B2, C0B4 and C0B6 react to both reads and writes according to the manual.
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Roman Donchenko 2024-10-13 17:29:10 +03:00 committed by GitHub
parent b49a1dc010
commit ec9aec11be
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GPG Key ID: B5690EEEBB952194
1 changed files with 34 additions and 18 deletions
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52
src/devices/bus/a2bus/suprterminal.cpp
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@ -75,6 +75,8 @@ private:
std::unique_ptr<u8[]> m_fontram;
// u8 m_fontram[0x400];
bool m_bRasterRAM, m_bCharBank1, m_bC800IsRAM;
void access_c0nx(u8 offset);
};
//-------------------------------------------------
@ -145,18 +147,7 @@ u8 a2bus_suprterminal_device::read_cnxx(u8 offset)
return m_rom[offset+0x300];
}
u8 a2bus_suprterminal_device::read_c0nx(u8 offset)
{
switch (offset)
{
case 9:
return m_crtc->register_r();
}
return 0xff;
}
void a2bus_suprterminal_device::write_c0nx(u8 offset, u8 data)
void a2bus_suprterminal_device::access_c0nx(u8 offset)
{
switch (offset)
{
@ -173,14 +164,39 @@ void a2bus_suprterminal_device::write_c0nx(u8 offset, u8 data)
case 6:
m_bCharBank1 ^= 1;
break;
}
}
case 8:
m_crtc->address_w(data);
break;
u8 a2bus_suprterminal_device::read_c0nx(u8 offset)
{
if (offset < 8)
{
if (!machine().side_effects_disabled())
{
access_c0nx(offset);
}
}
else if (offset == 9)
{
return m_crtc->register_r();
}
case 9:
m_crtc->register_w(data);
break;
return 0xff;
}
void a2bus_suprterminal_device::write_c0nx(u8 offset, u8 data)
{
if (offset < 8)
{
access_c0nx(offset);
}
else if (offset == 8)
{
m_crtc->address_w(data);
}
else if (offset == 9)
{
m_crtc->register_w(data);
}
}