Initial submission of the PCem-Experimental source code.

2016-06-26 00:34:39 +02:00
parent 09d7c4384f
commit fd2a5bc9f5
610 changed files with 184352 additions and 0 deletions
--- a/src/dac.c
+++ b/src/dac.c
@@ -0,0 +1,68 @@
+#include "ibm.h"
+
+uint8_t dac,dac2;
+uint8_t dacctrl;
+int lptfifo;
+uint8_t dssbuffer[16];
+int dssstart=0,dssend=0;
+int dssmode=0;
+
+void writedac(uint16_t addr, uint8_t val)
+{
+        if (dssmode) dac2=val;
+        else         dac=val;
+}
+
+void writedacctrl(uint16_t addr, uint8_t val)
+{
+//        printf("Write DAC ctrl %02X %i\n",val,lptfifo);
+        if (dacctrl&8 && !(val&8) && (lptfifo!=16))
+        {
+//                dac=dac2;
+                dssbuffer[dssend++]=dac2;
+                dssend&=15;
+                lptfifo++;
+        }
+        dacctrl=val;
+}
+
+uint8_t readdacfifo()
+{
+        if (lptfifo==16) return 0x40;
+        return 0;
+}
+
+void pollss()
+{
+        if (lptfifo)
+        {
+                dac=dssbuffer[dssstart++];
+                dssstart&=15;
+                lptfifo--;
+        }
+}
+
+int16_t dacbuffer[SOUNDBUFLEN+20];
+int dacbufferpos=0;
+void getdacsamp()
+{
+        if (dacbufferpos<SOUNDBUFLEN+20) dacbuffer[dacbufferpos++]=(((int)(unsigned int)dac)-0x80)*0x20;
+}
+
+void adddac(int16_t *p)
+{
+        int c;
+        if (dacbufferpos>SOUNDBUFLEN) dacbufferpos=SOUNDBUFLEN;
+        for (c=0;c<dacbufferpos;c++)
+        {
+                p[c<<1]+=(dacbuffer[c]);
+                p[(c<<1)+1]+=(dacbuffer[c]);
+        }
+        for (;c<SOUNDBUFLEN;c++)
+        {
+                p[c<<1]+=(dacbuffer[dacbufferpos-1]);
+                p[(c<<1)+1]+=(dacbuffer[dacbufferpos-1]);
+        }
+        dacbufferpos=0;
+}
+