emul: implement AT-XY

VI, here we come!

emul/Makefile

@@ -31,7 +31,8 @@ emul.o: emul.c
 
 .PHONY: updatebootstrap
 updatebootstrap: stage xcomp.fs pack
-	./stage < xcomp.fs | tee forth.bin > /dev/null
+	./stage < xcomp.fs > new.bin
+	mv new.bin forth.bin
 
 .PHONY: pack
 pack:

emul/forth.c

@@ -17,6 +17,8 @@
 // read 1024 bytes from the DATA port.
 #define BLK_PORT 0x03
 #define BLKDATA_PORT 0x04
+#define SETX_PORT 0x05
+#define SETY_PORT 0x06
 
 static FILE *fp;
 static int retcode = 0;
@@ -64,6 +66,18 @@ static void iowr_ret(uint8_t val)
     retcode = val;
 }
 
+static void iowr_setx(uint8_t val)
+{
+    int y, x; getyx(w, y, x);
+    wmove(w, y, val);
+}
+
+static void iowr_sety(uint8_t val)
+{
+    int y, x; getyx(w, y, x);
+    wmove(w, val, x);
+}
+
 int main(int argc, char *argv[])
 {
     Machine *m = emul_init();
@@ -74,6 +88,8 @@ int main(int argc, char *argv[])
     m->iord[STDIO_PORT] = iord_stdio;
     m->iowr[STDIO_PORT] = iowr_stdio;
     m->iowr[RET_PORT] = iowr_ret;
+    m->iowr[SETX_PORT] = iowr_setx;
+    m->iowr[SETY_PORT] = iowr_sety;
     w = NULL;
     if (argc == 2) {
         fp = fopen(argv[1], "r");

emul/xcomp.fs

@@ -22,6 +22,8 @@
         BLK( I + C@ 4 PC!
     LOOP
 ;
+: COLS 80 ; : LINES 32 ;
+: AT-XY 6 PC! ( y ) 5 PC! ( x ) ;
 
 380 LOAD  ( xcomp core high )
 (entry) _