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machine/micomx1a.cpp: Confirmed Digital MD mode emulates a 3-button Sega pad.

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This commit is contained in:
Vas Crabb 2022-12-19 02:06:18 +11:00
parent d6fe526b28
commit bfa14b837b
1 changed files with 76 additions and 31 deletions
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51
src/devices/machine/micomxe1a.cpp
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@ -58,6 +58,16 @@
Start appears as simultaneous Left/Right Start appears as simultaneous Left/Right
Select appears as simultaneous Up/Down Select appears as simultaneous Up/Down
Digital MD mode emulates a 3-button Mega Drive pad:
Req 0 1
D0 Up Up
D1 Down Down
D2 0 Left
D3 0 Right
L/H A B
Ack Start C
This mode is almost compatible with a 6-button Towns Pad (on a This mode is almost compatible with a 6-button Towns Pad (on a
real 6-button Towns Pad, buttons A and B can be read in either real 6-button Towns Pad, buttons A and B can be read in either
state, they bypass the multiplexer). state, they bypass the multiplexer).
@ -66,9 +76,8 @@
* Dump MB88513 microcontroller from original controller. * Dump MB88513 microcontroller from original controller.
* Measure timings. * Measure timings.
* Latch data at beginning of packet. * Latch data at beginning of packet.
* Confirm A', B', E1 and E2 bit mappings in analog mode. * Confirm button mapping in digital mode.
* Confirm buttons mapping in digital mode. * Estimate thresholds in digital modes.
- Is the mapping different in PC vs MD mode?
* Implement trigger A/B rapid fire switches. * Implement trigger A/B rapid fire switches.
* Implement channel shift switch (Y->X, X->Z, Z->X). * Implement channel shift switch (Y->X, X->Z, Z->X).
* Implement special modes (holding buttons on power-on): * Implement special modes (holding buttons on power-on):
@ -128,6 +137,41 @@ u8 micom_xe_1a_device::out_r()
else else
{ {
u16 const buttons = m_buttons_callback(); u16 const buttons = m_buttons_callback();
if (m_interface)
{
u8 const y = m_analog_callback(0);
if (m_req)
{
u8 const x = m_analog_callback(1);
u8 const result =
((0x40 <= y) ? 0x01 : 0x00) | // Up
((0xc0 > y) ? 0x02 : 0x00) | // Down
((0x40 <= x) ? 0x04 : 0x00) | // Left
((0xc0 > x) ? 0x08 : 0x00) | // Right
((BIT(buttons, 2) & BIT(buttons, 8)) << 4) | // B/B'
(BIT(buttons, 1) << 5); // C
LOG(
"%s: MD digital mode basic read = 0x%02X\n",
machine().describe_context(),
result);
return result;
}
else
{
u8 const result =
((0x40 <= y) ? 0x01 : 0x00) | // Up
((0xc0 > y) ? 0x02 : 0x00) | // Down
((BIT(buttons, 3) & BIT(buttons, 9)) << 4) | // A/A'
(BIT(buttons, 5) << 5); // Start
LOG(
"%s: MD digital mode extended read = 0x%02X\n",
machine().describe_context(),
result);
return result;
}
}
else
{
if (m_req) if (m_req)
{ {
u8 const z = m_analog_callback(2); u8 const z = m_analog_callback(2);
@ -162,6 +206,7 @@ u8 micom_xe_1a_device::out_r()
return result; return result;
} }
} }
}
} }