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[Core/CPU] fixed Z80 interrupt duration (fixes music running too fast in Bomb on Basic City homebrew)

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This commit is contained in:
EkeEke 2016-08-16 00:02:33 +02:00
parent fa8929eb3d
commit 446d9aa61f
5 changed files with 8 additions and 34 deletions
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2
HISTORY.txt
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@ -74,6 +74,8 @@ Genesis Plus GX 1.7.5 (xx/xx/xxxx) (Eke-Eke)
[Core/CPU]
---------------
* improved 68k auto-vectored interrupts acknowledge cycle timing accuracy (Bubsy background color corruption during cutscenes)
* fixed Z80 interrupt duration (Bomb on Basic City music running too fast)
* fixed Z80 SP register initialization on power-on for Master System & Game Gear
(Ace of Aces, Shadow Dancer, Ecco the Dolphin, Evander Holyfield Real Deal Boxing)

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builds/genesis_plus_gx_libretro.dll
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40
core/system.c
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@ -517,6 +517,9 @@ void system_frame_gen(int do_skip)
Z80.cycles = MCYCLES_PER_LINE;
}
/* Z80 interrupt is cleared at the end of the line */
Z80.irq_state = CLEAR_LINE;
/* run SVP chip */
if (svp)
{
@ -548,23 +551,6 @@ void system_frame_gen(int do_skip)
/* update 6-Buttons & Lightguns */
input_refresh();
if (Z80.irq_state)
{
/* Z80 interrupt is asserted for exactly one line */
m68k_run(mcycles_vdp + 788);
if (zstate == 1)
{
z80_run(mcycles_vdp + 788);
}
else
{
Z80.cycles = mcycles_vdp + 788;
}
/* clear Z80 interrupt */
Z80.irq_state = CLEAR_LINE;
}
/* run 68k & Z80 until end of line */
m68k_run(mcycles_vdp + MCYCLES_PER_LINE);
if (zstate == 1)
@ -888,6 +874,9 @@ void system_frame_scd(int do_skip)
Z80.cycles = MCYCLES_PER_LINE;
}
/* Z80 interrupt is cleared at the end of the line */
Z80.irq_state = CLEAR_LINE;
/* update VDP cycle count */
mcycles_vdp = MCYCLES_PER_LINE;
@ -913,23 +902,6 @@ void system_frame_scd(int do_skip)
/* update 6-Buttons & Lightguns */
input_refresh();
if (Z80.irq_state)
{
/* Z80 interrupt is asserted for exactly one line */
m68k_run(mcycles_vdp + 788);
if (zstate == 1)
{
z80_run(mcycles_vdp + 788);
}
else
{
Z80.cycles = mcycles_vdp + 788;
}
/* clear Z80 interrupt */
Z80.irq_state = CLEAR_LINE;
}
/* run both 68k & CD hardware until end of line */
scd_update(mcycles_vdp + MCYCLES_PER_LINE);