v0.69: Small bug-fixes and improvements

- Compiler: do not emit LDI 0, DISC sequence, which is a no-op.
- VM: add GPL info and progress when loading bytecode
- Most importantly: a version of Tetris coded in EightBall!

Makefile

@@ -13,7 +13,7 @@ APPLECMDR = ~/Desktop/Apple2/AppleCommander-1.3.5.jar
 all: eightball eightballvm 8ball20.prg 8ballvm20.prg 8ball64.prg 8ballvm64.prg eightball.system ebvm.system test.d64 test.dsk
 
 clean:
-	rm -f eightball eightballvm *.o 8ball20.* 8ball64.* eightball*.s eightball.system test.d64 *.map
+	rm -f eightball eightballvm *.o 8ball20.* 8ball64.* eightball*.s eightball.system test.d64 *.map *.vice
 
 eightball.o: eightball.c eightballutils.h eightballvm.h
 	# 32 bit so sizeof(int*) = sizeof(int) [I am lazy]

eightball.c

@@ -3637,12 +3637,10 @@ unsigned char docall()
 
                     /* Caller must drop the arguments
                      * pushed to call stack above */
-                    emitldi(argbytes);
+                    if (argbytes) {
-                    emit(VM_DISCARD);
+                        emitldi(argbytes);
-                    //for (j = 0; j < argbytes; ++j) {
+                        emit(VM_DISCARD);
-                    //    emit(VM_POPBYTE);
+                    }
-                    //    emit(VM_DROP);
-                    //}
                 } else {
                     /* Stash pointer to just after the call stmt */
                     push_return((int) txtPtr);

eightballutils.c

@@ -136,8 +136,6 @@ void getln(char *str, unsigned char buflen)
     unsigned char j = 0;
 #ifdef A2E
     unsigned char key;
-    unsigned char xpos;
-    unsigned char ypos;
 #endif
     do {
         i = read(0, str + j, 1);

eightballutils.h

@@ -37,7 +37,7 @@
 /*                                                                        */
 /**************************************************************************/
 
-#define VERSIONSTR "0.68"
+#define VERSIONSTR "0.69"
 
 void print(char *str);
 

eightballvm.c

@@ -785,12 +785,17 @@ void load()
     fp = fopen("bytecode", "r");
     while (!feof(fp)) {
         ch = fgetc(fp);
-        //printhexbyte(ch);
-        //printchar('\n');
         memory[pc++] = ch;
+        /* Print dot for each page */
+        if (pc%0xff == 0) {
+            printchar('.');
+        }
     }
     fclose(fp);
     pc = RTPCSTART;
+#ifdef A2E
+    printchar(7);
+#endif
 }
 
 int main()
@@ -799,10 +804,14 @@ int main()
 #ifdef STACKCHECKS
     print("[Stack Checks ON]\n");
 #endif
-    print("(c)Bobbi, 2018\n\n");
+    print("(c)Bobbi, 2018\n");
+    print("Free Software.\n");
+    print("Licenced under GPL.\n\n");
     print("Loading bytecode: ");
     load();
-    print("Done\n");
+#ifdef __GNUC__
+    print(" Done.\n\n");
+#endif
 #ifdef A2E
     videomode(VIDEOMODE_80COL);
     clrscr();