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polyvti: Add status port (nw)

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This commit is contained in:
AJR 2019-07-18 22:48:24 -04:00
parent a0ca0e8e7d
commit 94f87336f9
1 changed files with 15 additions and 1 deletions
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16
src/devices/bus/s100/polyvti.cpp
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@ -63,6 +63,8 @@ private:
// internal state
std::unique_ptr<u8[]> m_video_ram;
bool m_kbd_int;
bool m_kbd_stb;
};
DEFINE_DEVICE_TYPE_PRIVATE(S100_POLY_VTI, device_s100_card_interface, poly_vti_device, "polyvti", "PolyMorphic Systems Video Terminal Interface")
@ -78,8 +80,13 @@ poly_vti_device::poly_vti_device(const machine_config &mconfig, const char *tag,
void poly_vti_device::device_start()
{
m_kbd_int = true;
m_kbd_stb = false; // TODO: 8212 strobe input
m_video_ram = make_unique_clear<u8[]>(0x400);
save_pointer(NAME(m_video_ram), 0x400);
save_item(NAME(m_kbd_int));
save_item(NAME(m_kbd_stb));
}
const u8 poly_vti_device::s_mcm6571a_shift[] =
@ -179,7 +186,12 @@ void poly_vti_device::s100_mwrt_w(offs_t offset, u8 data)
u8 poly_vti_device::s100_sinp_r(offs_t offset)
{
if ((offset & 0xfc00) >> 10 == m_address->read())
return m_kbdlatch->read();
{
if (BIT(offset, 0))
return m_kbd_stb << 7 | 0x7e | m_kbd_int;
else
return m_kbdlatch->read();
}
return 0xff;
}
@ -196,6 +208,8 @@ void poly_vti_device::kbd_put(u8 data)
WRITE_LINE_MEMBER(poly_vti_device::kbd_int_w)
{
m_kbd_int = !state;
// TODO: jumper selectable
m_bus->vi2_w(state);
}