Add DskGetIndexBlock(), DskPutIndexBlock() prodos helpers

2017-11-07 08:43:09 -08:00 · 2017-11-07 08:43:09 -08:00 · b31fd85c18
parent 866304d006
commit b31fd85c18
1 changed files with 19 additions and 0 deletions
--- a/generic.disk.cpp
+++ b/generic.disk.cpp
@ -58,6 +58,25 @@
        gaDsk[ offset + 2 ] = (val >>16) & 0xFF;
    }

+    int DskGetIndexBlock( int offset, int index )
+    {
+        int block = 0
+        | (gaDsk[ offset + index + 0   ] << 0)
+        | (gaDsk[ offset + index + 256 ] << 8)
+        ;
+        return block;
+    }
+
+    /*
+        000:lo0 lo1 lo2 ...
+        100:hi0 hi1 hi2 ...
+    */
+    void DskPutIndexBlock( int offset, int index, int block )
+    {
+        gaDsk[ offset + index + 0   ] = (block >> 0) & 0xFF;
+        gaDsk[ offset + index + 256 ] = (block >> 8) & 0xFF;
+    }
+

 // --- Name ---