sio: emulate "card not inserted" state

an idea from shalma.
"no card" and response byte 1 behavior tested on real hardware.

diff --git a/libpcsxcore/sio.c b/libpcsxcore/sio.c
index 12fd0bd..4a0a73c 100644 (file)
--- a/libpcsxcore/sio.c
+++ b/libpcsxcore/sio.c
@@ -48,7 +48,8 @@
 // *** FOR WORKS ON PADS AND MEMORY CARDS *****
 
 static unsigned char buf[256];
-unsigned char cardh[4] = { 0x00, 0x00, 0x5a, 0x5d };
+static unsigned char cardh1[4] = { 0xff, 0x08, 0x5a, 0x5d };
+static unsigned char cardh2[4] = { 0xff, 0x08, 0x5a, 0x5d };
 
 // Transfer Ready and the Buffer is Empty
 // static unsigned short StatReg = 0x002b;
@@ -64,6 +65,7 @@ static unsigned char adrH, adrL;
 static unsigned int padst;
 
 char Mcd1Data[MCD_SIZE], Mcd2Data[MCD_SIZE];
+char McdDisable[2];
 
 #define SIO_INT(eCycle) { \
        if (!Config.Sio) { \
@@ -204,6 +206,14 @@ void sioWrite8(unsigned char value) {
                        return;
                case 5:
                        parp++;
+                       if ((rdwr == 1 && parp == 132) ||
+                           (rdwr == 2 && parp == 129)) {
+                               // clear "new card" flags
+                               if (CtrlReg & 0x2000)
+                                       cardh2[1] &= ~8;
+                               else
+                                       cardh1[1] &= ~8;
+                       }
                        if (rdwr == 2) {
                                if (parp < 128) buf[parp + 1] = value;
                        }
@@ -258,14 +268,32 @@ void sioWrite8(unsigned char value) {
                        SIO_INT(SIO_CYCLES);
                        return;
                case 0x81: // start memcard
+                       if (CtrlReg & 0x2000)
+                       {
+                               if (McdDisable[1])
+                                       goto no_device;
+                               memcpy(buf, cardh2, 4);
+                       }
+                       else
+                       {
+                               if (McdDisable[0])
+                                       goto no_device;
+                               memcpy(buf, cardh1, 4);
+                       }
                        StatReg |= RX_RDY;
-                       memcpy(buf, cardh, 4);
                        parp = 0;
                        bufcount = 3;
                        mcdst = 1;
                        rdwr = 0;
                        SIO_INT(SIO_CYCLES);
                        return;
+               default:
+               no_device:
+                       StatReg |= RX_RDY;
+                       buf[0] = 0xff;
+                       parp = 0;
+                       bufcount = 0;
+                       return;
        }
 }
 
@@ -366,12 +394,22 @@ void LoadMcd(int mcd, char *str) {
        FILE *f;
        char *data = NULL;
 
-       if (mcd == 1) data = Mcd1Data;
-       if (mcd == 2) data = Mcd2Data;
+       if (mcd != 1 && mcd != 2)
+               return;
 
-       if (*str == 0) {
-               sprintf(str, "memcards/card%d.mcd", mcd);
-               SysPrintf(_("No memory card value was specified - creating a default card %s\n"), str);
+       if (mcd == 1) {
+               data = Mcd1Data;
+               cardh1[1] |= 8; // mark as new
+       }
+       if (mcd == 2) {
+               data = Mcd2Data;
+               cardh2[1] |= 8;
+       }
+
+       McdDisable[mcd - 1] = 0;
+       if (str == NULL || *str == 0) {
+               McdDisable[mcd - 1] = 1;
+               return;
        }
        f = fopen(str, "rb");
        if (f == NULL) {
@@ -680,6 +718,12 @@ void GetMcdBlockInfo(int mcd, int block, McdBlock *Info) {
 
        memset(Info, 0, sizeof(McdBlock));
 
+       if (mcd != 1 && mcd != 2)
+               return;
+
+       if (McdDisable[mcd - 1])
+               return;
+
        if (mcd == 1) data = Mcd1Data;
        if (mcd == 2) data = Mcd2Data;