#endif // EMU_M68K\r
\r
\r
+// -----------------------------------------------------------------\r
+\r
+extern const unsigned short vcounts[];\r
+\r
+static int get_scanline(int is_from_z80)\r
+{\r
+ if (is_from_z80) {\r
+ int cycles = z80_cyclesDone();\r
+ while (cycles - z80_scanline_cycles >= 228)\r
+ z80_scanline++, z80_scanline_cycles += 228;\r
+ return z80_scanline;\r
+ }\r
+\r
+ if (Pico.m.scanline != -1)\r
+ return Pico.m.scanline;\r
+\r
+ return vcounts[SekCyclesDone()>>8];\r
+}\r
+\r
+// ym2612 DAC and timer I/O handlers for z80\r
+int ym2612_write_local(u32 a, u32 d, int is_from_z80)\r
+{\r
+ int addr;\r
+\r
+ a &= 3;\r
+ if (a == 1 && ym2612.OPN.ST.address == 0x2a) /* DAC data */\r
+ {\r
+ int scanline = get_scanline(is_from_z80);\r
+ //elprintf(EL_STATUS, "%03i -> %03i dac w %08x z80 %i", PsndDacLine, scanline, d, is_from_z80);\r
+ ym2612.dacout = ((int)d - 0x80) << 6;\r
+ if (PsndOut && ym2612.dacen && scanline >= PsndDacLine)\r
+ PsndDoDAC(scanline);\r
+ return 0;\r
+ }\r
+\r
+ switch (a)\r
+ {\r
+ case 0: /* address port 0 */\r
+ ym2612.OPN.ST.address = d;\r
+ ym2612.addr_A1 = 0;\r
+#ifdef __GP2X__\r
+ if (PicoOpt & POPT_EXT_FM) YM2612Write_940(a, d, -1);\r
+#endif\r
+ return 0;\r
+\r
+ case 1: /* data port 0 */\r
+ if (ym2612.addr_A1 != 0)\r
+ return 0;\r
+\r
+ addr = ym2612.OPN.ST.address;\r
+ ym2612.REGS[addr] = d;\r
+\r
+ switch (addr)\r
+ {\r
+ case 0x24: // timer A High 8\r
+ case 0x25: { // timer A Low 2\r
+ int TAnew = (addr == 0x24) ? ((ym2612.OPN.ST.TA & 0x03)|(((int)d)<<2))\r
+ : ((ym2612.OPN.ST.TA & 0x3fc)|(d&3));\r
+ if (ym2612.OPN.ST.TA != TAnew)\r
+ {\r
+ //elprintf(EL_STATUS, "timer a set %i", TAnew);\r
+ ym2612.OPN.ST.TA = TAnew;\r
+ //ym2612.OPN.ST.TAC = (1024-TAnew)*18;\r
+ //ym2612.OPN.ST.TAT = 0;\r
+ //\r
+ timer_a_step = 16495 * (1024 - TAnew);\r
+ if ((ym2612.OPN.ST.mode & 5) == 5) {\r
+ int cycles = is_from_z80 ? z80_cyclesDone() : cycles_68k_to_z80(SekCyclesDone());\r
+ timer_a_next_oflow = (cycles << 8) + timer_a_step;\r
+ //elprintf(EL_STATUS, "set to %i @ %i", timer_a_next_oflow>>8, cycles);\r
+ }\r
+ }\r
+ return 0;\r
+ }\r
+ case 0x26: // timer B\r
+ if (ym2612.OPN.ST.TB != d) {\r
+ //elprintf(EL_STATUS, "timer b set %i", d);\r
+ ym2612.OPN.ST.TB = d;\r
+ //ym2612.OPN.ST.TBC = (256-d)<<4;\r
+ //ym2612.OPN.ST.TBC *= 18;\r
+ //ym2612.OPN.ST.TBT = 0;\r
+ }\r
+ return 0;\r
+ case 0x27: { /* mode, timer control */\r
+ int old_mode = ym2612.OPN.ST.mode;\r
+ int xcycles = is_from_z80 ? z80_cyclesDone() : cycles_68k_to_z80(SekCyclesDone());\r
+ xcycles <<= 8;\r
+\r
+ //elprintf(EL_STATUS, "st mode %02x", d);\r
+\r
+ if ((ym2612.OPN.ST.mode & 5) != 5 && (d & 5) == 5) {\r
+ timer_a_next_oflow = xcycles + timer_a_step;\r
+ //elprintf(EL_STATUS, "set to %i @ %i st", timer_a_next_oflow>>8, xcycles >> 8);\r
+ }\r
+\r
+ /* reset Timer b flag */\r
+ if (d & 0x20)\r
+ ym2612.OPN.ST.status &= ~2;\r
+\r
+ /* reset Timer a flag */\r
+ if (d & 0x10) {\r
+ if (ym2612.OPN.ST.status & 1)\r
+ while (xcycles > timer_a_next_oflow)\r
+ timer_a_next_oflow += timer_a_step;\r
+ ym2612.OPN.ST.status &= ~1;\r
+ }\r
+ if (!(d & 5)) timer_a_next_oflow = 0x80000000;\r
+ ym2612.OPN.ST.mode = d;\r
+#ifdef __GP2X__\r
+ if (PicoOpt & POPT_EXT_FM) YM2612Write_940(a, d, get_scanline(is_from_z80));\r
+#endif\r
+ return 0;\r
+ }\r
+ case 0x2b: { /* DAC Sel (YM2612) */\r
+ int scanline = get_scanline(is_from_z80);\r
+ ym2612.dacen = d & 0x80;\r
+ if (d & 0x80) PsndDacLine = scanline;\r
+#ifdef __GP2X__\r
+ if (PicoOpt & POPT_EXT_FM) YM2612Write_940(a, d, scanline);\r
+#endif\r
+ return 0;\r
+ }\r
+ }\r
+ break;\r
+\r
+ case 2: /* address port 1 */\r
+ ym2612.OPN.ST.address = d;\r
+ ym2612.addr_A1 = 1;\r
+#ifdef __GP2X__\r
+ if (PicoOpt & POPT_EXT_FM) YM2612Write_940(a, d, -1);\r
+#endif\r
+ return 0;\r
+\r
+ case 3: /* data port 1 */\r
+ if (ym2612.addr_A1 != 1)\r
+ return 0;\r
+\r
+ addr = ym2612.OPN.ST.address | 0x100;\r
+ ym2612.REGS[addr] = d;\r
+ break;\r
+ }\r
+\r
+#ifdef __GP2X__\r
+ if (PicoOpt & POPT_EXT_FM)\r
+ return YM2612Write_940(a, d, get_scanline(is_from_z80));\r
+#endif\r
+ return YM2612Write_(a, d);\r
+}\r
+\r
+// TODO: timer b, 68k side + asm, savestates\r
+u32 ym2612_read_local_z80(void)\r
+{\r
+ int xcycles = z80_cyclesDone() << 8;\r
+ if (timer_a_next_oflow != 0x80000000 && xcycles >= timer_a_next_oflow) {\r
+ ym2612.OPN.ST.status |= 1;\r
+ }\r
+\r
+ //elprintf(EL_STATUS, "timer %i, sched %i, @ %i|%i", ym2612.OPN.ST.status, timer_a_next_oflow>>8,\r
+ // xcycles >> 8, (xcycles >> 8) / 228);\r
+ return ym2612.OPN.ST.status;\r
+}\r
+\r
// -----------------------------------------------------------------\r
// z80 memhandlers\r
\r
\r
if ((a>>13)==2) // 0x4000-0x5fff (Charles MacDonald)\r
{\r
- if (PicoOpt&POPT_EN_FM) ret = (u8) YM2612Read();\r
+ if (PicoOpt&POPT_EN_FM) ret = ym2612_read_local_z80();\r
return ret;\r
}\r
\r
if (PicoAHW & PAHW_MCD)\r
ret = PicoReadM68k8(addr68k);\r
else ret = PicoRead8(addr68k);\r
- elprintf(EL_Z80BNK, "z80->68k r8 [%06x] %02x", addr68k, ret);\r
+ if (addr68k >= 0x400000) // not many games do this\r
+ { elprintf(EL_ANOMALY, "z80->68k upper read [%06x] %02x", addr68k, ret); }\r
+ else\r
+ { elprintf(EL_Z80BNK, "z80->68k r8 [%06x] %02x", addr68k, ret); }\r
return ret;\r
}\r
\r
{\r
if ((a>>13)==2) // 0x4000-0x5fff (Charles MacDonald)\r
{\r
- if(PicoOpt&POPT_EN_FM) emustatus|=YM2612Write(a, data) & 1;\r
+ if(PicoOpt&POPT_EN_FM) emustatus|=ym2612_write_local(a, data, 1) & 1;\r
return;\r
}\r
\r
notaz.gp2x.de / picodrive.git / blobdiff