Design change: Do keyboard polling internally without calling the kernal

in the system bank. For one this performs better (several %), second it
allows to handle the function keys in conformance with other platforms.
Without the custom keyboard routine, we would have to apply some more
magic to the function keys to make them work as with other cc65 targets.


git-svn-id: svn://svn.cc65.org/cc65/trunk@2811 b7a2c559-68d2-44c3-8de9-860c34a00d81

libsrc/cbm610/cputc.s

@@ -7,9 +7,11 @@
 
     	.export	      	_cputcxy, _cputc, cputdirect, putchar
 	.export	      	newline, plot
+	.destructor	setsyscursor
 
 	.import	      	_gotoxy
 	.import	      	popa
+	.import		PLOT
 
         .import         ktmp: zp, crtc: zp, CURS_X: zp, CURS_Y: zp, RVS: zp
         .import         CharPtr: zp
@@ -132,6 +134,17 @@ plot:   ldx     CURS_Y
 	sta	IndReg
 	rts
 
+; -------------------------------------------------------------------------
+; Cleanup routine that sets the kernal cursor position to ours
+
+.segment	"PAGE2"
+
+setsyscursor:
+	ldy	CURS_X
+	ldx	CURS_Y
+	clc
+	jmp	PLOT		; Set the new cursor
+
 ; -------------------------------------------------------------------------
 ; Low bytes of the start address of the screen lines