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Fixed broken MID interrupt handling. [Michael Zapf]

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This commit is contained in:
Michael Zapf 2013-10-21 21:43:41 +00:00
parent e1aa7f10bd
commit a2b7ca2961
2 changed files with 8 additions and 3 deletions
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10
src/emu/cpu/tms9900/tms9995.c
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@ -175,6 +175,7 @@ void tms9995_device::device_start()
m_int_pending = 0; m_int_pending = 0;
m_mid_flag = false; m_mid_flag = false;
m_mid_active = false;
m_nmi_active = false; m_nmi_active = false;
m_int_overflow = false; m_int_overflow = false;
m_int_decrementer = false; m_int_decrementer = false;
@ -1294,7 +1295,7 @@ void tms9995_device::decode(UINT16 inst)
int dindex = (m_instindex==0)? 1:0; int dindex = (m_instindex==0)? 1:0;
m_mid_flag = false; m_mid_active = false;
while (!complete) while (!complete)
{ {
@ -1437,6 +1438,7 @@ void tms9995_device::next_command()
if (m_decoded[next].command == MID) if (m_decoded[next].command == MID)
{ {
m_mid_flag = true; m_mid_flag = true;
m_mid_active = true;
service_interrupt(); service_interrupt();
} }
else else
@ -1523,12 +1525,13 @@ void tms9995_device::service_interrupt()
} }
else else
{ {
if (m_mid_flag) if (m_mid_active)
{ {
vectorpos = 0x0008; vectorpos = 0x0008;
m_intmask = 0x0001; m_intmask = 0x0001;
PC = (PC + 2) & 0xfffe; PC = (PC + 2) & 0xfffe;
if (VERBOSE>7) LOG("tms9995: ***** MID pending\n"); if (VERBOSE>7) LOG("tms9995: ***** MID pending\n");
m_mid_active = false;
} }
else else
{ {
@ -1913,7 +1916,7 @@ void tms9995_device::cru_output_operation()
if (m_cru_address == 0x1fda) if (m_cru_address == 0x1fda)
{ {
// [1], section 2.3.3.2.2: "setting the MID to one with a CRU instruction // [1], section 2.3.3.2.2: "setting the MID flag to one with a CRU instruction
// will not cause the MID interrupt to be requested." // will not cause the MID interrupt to be requested."
m_check_ready = false; m_check_ready = false;
m_mid_flag = (m_cru_value & 0x01); m_mid_flag = (m_cru_value & 0x01);
@ -3291,6 +3294,7 @@ void tms9995_device::alu_int()
m_from_reset = false; m_from_reset = false;
ST &= 0x01ff; ST &= 0x01ff;
m_mid_flag = false; m_mid_flag = false;
m_mid_active = false;
// FLAG0 and FLAG1 are also set to zero after RESET ([1], sect. 2.3.1.2.2) // FLAG0 and FLAG1 are also set to zero after RESET ([1], sect. 2.3.1.2.2)
for (int i=0; i < 5; i++) m_flag[i] = false; for (int i=0; i < 5; i++) m_flag[i] = false;
m_check_hold = true; m_check_hold = true;

1
src/emu/cpu/tms9900/tms9995.h
View File

@ -171,6 +171,7 @@ private:
bool m_reset; bool m_reset;
bool m_from_reset; bool m_from_reset;
bool m_mid_flag; bool m_mid_flag;
bool m_mid_active;
// Flag field // Flag field
int m_int_pending; int m_int_pending;