[VM][UPD71071] Implementing: Add 16bit (word) transfer mode.WIP.

diff --git a/source/src/vm/upd71071.cpp b/source/src/vm/upd71071.cpp
index 08282dc..38ae7c2 100644 (file)
--- a/source/src/vm/upd71071.cpp
+++ b/source/src/vm/upd71071.cpp
@@ -185,13 +185,35 @@ void UPD71071::do_dma()
        if(cmd & 4) {
                return;
        }
-       
+       // ToDo: Will check WORD transfer mode for FM-Towns.(mode.bit0 = '1).
        // run dma
        for(int c = 0; c < 4; c++) {
                uint8_t bit = 1 << c;
                if(((req | sreq) & bit) && !(mask & bit)) {
                        // execute dma
                        while((req | sreq) & bit) {
+#if 0
+                               if((dma[c].mode & 0x01) == 1) { // 16bit transfer mode.
+                                       if((dma[c].mode & 0x0c) == 4) {
+                                               // io -> memory
+                                               uint32_t val = dma[c].dev->read_dma_io16(0);
+                                               d_mem->write_dma_data16(dma[c].areg, val);
+                                               // update temporary register
+                                               tmp = val;
+                                       } else if((dma[c].mode & 0x0c) == 8) {
+                                               // memory -> io
+                                               uint32_t val = d_mem->read_dma_data16(dma[c].areg);
+                                               dma[c].dev->write_dma_io16(0, val);
+                                               // update temporary register
+                                               tmp = val;
+                                       }
+                                       if(dma[c].mode & 0x20) {
+                                               dma[c].areg = (dma[c].areg - 2) & 0xffffff;
+                                       } else {
+                                               dma[c].areg = (dma[c].areg + 2) & 0xffffff;
+                                       }
+                               } else { // 8bit mode
+#endif
                                if((dma[c].mode & 0x0c) == 4) {
                                        // io -> memory
                                        uint32_t val = dma[c].dev->read_dma_io8(0);
@@ -210,6 +232,9 @@ void UPD71071::do_dma()
                                } else {
                                        dma[c].areg = (dma[c].areg + 1) & 0xffffff;
                                }
+#if 0 // 16bit mode
+                               }
+#endif
                                if(dma[c].creg-- == 0) {
                                        // TC
                                        if(dma[c].mode & 0x10) {