gfx chip faker, hint vector

[picodrive.git] / Pico / cd / Pico.c

diff --git a/Pico/cd/Pico.c b/Pico/cd/Pico.c
index d987956..9e87e9e 100644 (file)
--- a/Pico/cd/Pico.c
+++ b/Pico/cd/Pico.c
@@ -32,6 +32,7 @@ int PicoResetMCD(int hard)
 {
   // clear everything except BIOS
   memset(Pico_mcd->prg_ram, 0, sizeof(mcd_state) - sizeof(Pico_mcd->bios));
+  *(unsigned int *)(Pico_mcd->bios + 0x70) = 0xffffffff; // reset hint vector (simplest way to implement reg6)
   PicoMCD |= 2; // s68k reset pending
   Pico_mcd->s68k_regs[3] = 1; // 2M word RAM mode with m68k access after reset
   counter75hz = 0;
@@ -64,9 +65,23 @@ static __inline void SekRunS68k(int cyc)
 #endif
 }
 
-// TODO: tidy
-extern unsigned char m68k_regs[0x40];
-extern unsigned char s68k_regs[0x200];
+static __inline void check_cd_dma(void)
+{
+       int ddx;
+
+       if (!(Pico_mcd->scd.Status_CDC & 0x08)) return;
+
+       ddx = Pico_mcd->s68k_regs[4] & 7;
+       if (ddx <  2) return; // invalid
+       if (ddx <  4) {
+               Pico_mcd->s68k_regs[4] |= 0x40; // Data set ready in host port
+               return;
+       }
+       if (ddx == 6) return; // invalid
+
+       Update_CDC_TRansfer(ddx); // now go and do the actual transfer
+}
+
 
 // Accurate but slower frame which does hints
 static int PicoFrameHintsMCD(void)
@@ -115,6 +130,8 @@ static int PicoFrameHintsMCD(void)
       if(Pico.m.padDelay[1]++ > 25) Pico.m.padTHPhase[1]=0;
     }
 
+    check_cd_dma();
+
     // H-Interrupts:
     if(y <= lines_vis && --hint < 0) // y <= lines_vis: Comix Zone, Golden Axe
     {
@@ -165,7 +182,7 @@ static int PicoFrameHintsMCD(void)
       //dprintf("m68k starting exec @ %06x", SekPc);
     if(Pico.m.dma_bytes) SekCycleCnt+=CheckDMA();
     SekRun(cycles_68k);
-    if ((Pico_mcd->m68k_regs[1]&3) == 1) { // no busreq/no reset
+    if ((Pico_mcd->m.busreq&3) == 1) { // no busreq/no reset
 #if 0
            int i;
            FILE *f = fopen("prg_ram.bin", "wb");
@@ -193,6 +210,9 @@ static int PicoFrameHintsMCD(void)
       counter75hz -= counter75hz_lim;
       Check_CD_Command();
     }
+
+    if (Pico_mcd->rot_comp.Reg_58 & 0x8000)
+      gfx_cd_update();
   }
 
   // draw a frame just after vblank in alternative render mode