RaySollium99/picodrive
1
0
Fork 0
mirror of https://github.com/RaySollium99/picodrive.git synced 2025-09-05 07:17:45 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

adjust z80 timing a bit

Browse source
This commit is contained in:
notaz 2017-10-04 02:23:27 +03:00
parent ebd70cb5d9
commit 3162a7104c
4 changed files with 32 additions and 33 deletions
Download patch file Download diff file Expand all files Collapse all files

18
pico/memory.c
View file

@ -331,11 +331,10 @@ NOINLINE void io_ports_write(u32 a, u32 d)
Pico.ioports[a] = d;
}
// lame..
static int z80_cycles_from_68k(void)
{
return z80_cycle_aim
+ cycles_68k_to_z80(SekCyclesDone() - last_z80_sync);
int m68k_cnt = SekCyclesDone() - timing.m68c_frame_start;
return cycles_68k_to_z80(m68k_cnt);
}
void NOINLINE ctl_write_z80busreq(u32 d)
@ -346,7 +345,7 @@ void NOINLINE ctl_write_z80busreq(u32 d)
{
if (d)
{
z80_cycle_cnt = z80_cycles_from_68k();
timing.z80c_cnt = z80_cycles_from_68k() + 2;
}
else
{
@ -378,7 +377,7 @@ void NOINLINE ctl_write_z80reset(u32 d)
}
else
{
z80_cycle_cnt = z80_cycles_from_68k();
timing.z80c_cnt = z80_cycles_from_68k() + 2;
z80_reset();
}
Pico.m.z80_reset = d;
@ -896,10 +895,11 @@ static void m68k_mem_setup(void)
static int get_scanline(int is_from_z80)
{
if (is_from_z80) {
int cycles = z80_cyclesDone();
while (cycles - z80_scanline_cycles >= 228)
z80_scanline++, z80_scanline_cycles += 228;
return z80_scanline;
int mclk_z80 = z80_cyclesDone() * 15;
int mclk_line = timing.z80_scanline * 488 * 7;
while (mclk_z80 - mclk_line >= 488 * 7)
timing.z80_scanline++, mclk_line += 488 * 7;
return timing.z80_scanline;
}
return Pico.m.scanline;