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Yet another system 11 irq speed fix: Correct the E clock frequency used for the IRQ generation. Hopefully more games will pass their IRQ self-test now. [Lord Nightmare, Barry Rodewald]

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This commit is contained in:
Jonathan Gevaryahu 2012-12-28 12:07:44 +00:00
parent a45204f19c
commit 05001aad16
3 changed files with 26 additions and 14 deletions
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12
src/mame/drivers/s11.c
View File

@ -22,6 +22,10 @@ ToDo:
#include "sound/dac.h"
#include "s11.lh"
// 6802/8 CPU's input clock is 4MHz
// but because it has an internal /4 divider, its E clock runs at 1/4 that frequency
#define E_CLOCK (XTAL_4MHz/4)
// Length of time in cycles between IRQs on the main 6808 CPU
// This length is determined by the settings of the W14 and W15 jumpers
// It can be 0x300, 0x380, 0x700 or 0x780 cycles long.
@ -235,7 +239,7 @@ void s11_state::device_timer(emu_timer &timer, device_timer_id id, int param, vo
if(param == 1)
{
m_maincpu->set_input_line(M6800_IRQ_LINE,ASSERT_LINE);
m_irq_timer->adjust(attotime::from_ticks(32,XTAL_4MHz),0);
m_irq_timer->adjust(attotime::from_ticks(32,E_CLOCK),0);
m_pias->cb1_w(0);
m_irq_active = true;
m_pia28->ca1_w(BIT(ioport("DIAGS")->read(), 2)); // Advance
@ -244,7 +248,7 @@ void s11_state::device_timer(emu_timer &timer, device_timer_id id, int param, vo
else
{
m_maincpu->set_input_line(M6800_IRQ_LINE,CLEAR_LINE);
m_irq_timer->adjust(attotime::from_ticks(S11_IRQ_CYCLES,XTAL_4MHz),1);
m_irq_timer->adjust(attotime::from_ticks(S11_IRQ_CYCLES,E_CLOCK),1);
m_pias->cb1_w(1);
m_irq_active = false;
m_pia28->ca1_w(1);
@ -279,7 +283,7 @@ WRITE_LINE_MEMBER( s11_state::pia_irq )
if(state == CLEAR_LINE)
{
// restart IRQ timer
m_irq_timer->adjust(attotime::from_ticks(S11_IRQ_CYCLES,XTAL_4MHz),1);
m_irq_timer->adjust(attotime::from_ticks(S11_IRQ_CYCLES,E_CLOCK),1);
m_irq_active = false;
}
else
@ -591,7 +595,7 @@ DRIVER_INIT_MEMBER( s11_state, s11 )
membank("bank0")->set_entry(0);
membank("bank1")->set_entry(0);
m_irq_timer = timer_alloc(TIMER_IRQ);
m_irq_timer->adjust(attotime::from_ticks(S11_IRQ_CYCLES,XTAL_4MHz),1);
m_irq_timer->adjust(attotime::from_ticks(S11_IRQ_CYCLES,E_CLOCK),1);
m_irq_active = false;
}

14
src/mame/drivers/s11a.c
View File

@ -27,11 +27,15 @@ Note: To start a game, certain switches need to be activated. You must first pr
#include "sound/dac.h"
#include "s11a.lh"
// 6802/8 CPU's input clock is 4MHz
// but because it has an internal /4 divider, its E clock runs at 1/4 that frequency
#define E_CLOCK (XTAL_4MHz/4)
// Length of time in cycles between IRQs on the main 6808 CPU
// This length is determined by the settings of the W14 and W15 jumpers
// It can be 0x300, 0x380, 0x700 or 0x780 cycles long.
// IRQ length is always 32 cycles
#define S11_IRQ_CYCLES 0x700
#define S11_IRQ_CYCLES 0x380
class s11a_state : public genpin_class
{
@ -245,7 +249,7 @@ void s11a_state::device_timer(emu_timer &timer, device_timer_id id, int param, v
if(param == 1)
{
m_maincpu->set_input_line(M6800_IRQ_LINE,ASSERT_LINE);
m_irq_timer->adjust(attotime::from_ticks(32,XTAL_4MHz),0);
m_irq_timer->adjust(attotime::from_ticks(32,E_CLOCK),0);
m_pias->cb1_w(0);
m_irq_active = true;
m_pia28->ca1_w(BIT(ioport("DIAGS")->read(), 2)); // Advance
@ -254,7 +258,7 @@ void s11a_state::device_timer(emu_timer &timer, device_timer_id id, int param, v
else
{
m_maincpu->set_input_line(M6800_IRQ_LINE,CLEAR_LINE);
m_irq_timer->adjust(attotime::from_ticks(S11_IRQ_CYCLES,XTAL_4MHz),1);
m_irq_timer->adjust(attotime::from_ticks(S11_IRQ_CYCLES,E_CLOCK),1);
m_pias->cb1_w(1);
m_irq_active = false;
m_pia28->ca1_w(1);
@ -290,7 +294,7 @@ WRITE_LINE_MEMBER( s11a_state::pia_irq )
if(state == CLEAR_LINE)
{
// restart IRQ timer
m_irq_timer->adjust(attotime::from_ticks(S11_IRQ_CYCLES,XTAL_4MHz),1);
m_irq_timer->adjust(attotime::from_ticks(S11_IRQ_CYCLES,E_CLOCK),1);
m_irq_active = false;
}
else
@ -616,7 +620,7 @@ DRIVER_INIT_MEMBER( s11a_state, s11a )
membank("bank1")->set_entry(0);
membank("bgbank")->set_entry(0);
m_irq_timer = timer_alloc(TIMER_IRQ);
m_irq_timer->adjust(attotime::from_ticks(S11_IRQ_CYCLES,XTAL_4MHz),1);
m_irq_timer->adjust(attotime::from_ticks(S11_IRQ_CYCLES,E_CLOCK),1);
m_irq_active = false;
}

14
src/mame/drivers/s11b.c
View File

@ -17,6 +17,10 @@
#include "sound/dac.h"
#include "s11b.lh"
// 6802/8 CPU's input clock is 4MHz
// but because it has an internal /4 divider, its E clock runs at 1/4 that frequency
#define E_CLOCK (XTAL_4MHz/4)
// Length of time in cycles between IRQs on the main 6808 CPU
// This length is determined by the settings of the W14 and W15 jumpers
// It can be 0x300, 0x380, 0x700 or 0x780 cycles long.
@ -243,7 +247,7 @@ void s11b_state::device_timer(emu_timer &timer, device_timer_id id, int param, v
if(param == 1)
{
m_maincpu->set_input_line(M6800_IRQ_LINE,ASSERT_LINE);
m_irq_timer->adjust(attotime::from_ticks(32,XTAL_4MHz),0);
m_irq_timer->adjust(attotime::from_ticks(32,E_CLOCK),0);
m_pias->cb1_w(0);
m_irq_active = true;
m_pia28->ca1_w(BIT(ioport("DIAGS")->read(), 2)); // Advance
@ -252,7 +256,7 @@ void s11b_state::device_timer(emu_timer &timer, device_timer_id id, int param, v
else
{
m_maincpu->set_input_line(M6800_IRQ_LINE,CLEAR_LINE);
m_irq_timer->adjust(attotime::from_ticks(S11_IRQ_CYCLES,XTAL_4MHz),1);
m_irq_timer->adjust(attotime::from_ticks(S11_IRQ_CYCLES,E_CLOCK),1);
m_pias->cb1_w(1);
m_irq_active = false;
m_pia28->ca1_w(1);
@ -291,7 +295,7 @@ WRITE_LINE_MEMBER( s11b_state::pia_irq )
if(state == CLEAR_LINE)
{
// restart IRQ timer
m_irq_timer->adjust(attotime::from_ticks(S11_IRQ_CYCLES,XTAL_4MHz),1);
m_irq_timer->adjust(attotime::from_ticks(S11_IRQ_CYCLES,E_CLOCK),1);
m_irq_active = false;
}
else
@ -651,7 +655,7 @@ DRIVER_INIT_MEMBER( s11b_state, s11b )
membank("bgbank")->set_entry(0);
m_invert = false;
m_irq_timer = timer_alloc(TIMER_IRQ);
m_irq_timer->adjust(attotime::from_ticks(S11_IRQ_CYCLES,XTAL_4MHz),1);
m_irq_timer->adjust(attotime::from_ticks(S11_IRQ_CYCLES,E_CLOCK),1);
m_irq_active = false;
}
@ -667,7 +671,7 @@ DRIVER_INIT_MEMBER( s11b_state, s11b_invert )
membank("bgbank")->set_entry(0);
m_invert = true;
m_irq_timer = timer_alloc(TIMER_IRQ);
m_irq_timer->adjust(attotime::from_ticks(S11_IRQ_CYCLES,XTAL_4MHz),1);
m_irq_timer->adjust(attotime::from_ticks(S11_IRQ_CYCLES,E_CLOCK),1);
m_irq_active = false;
}