For the CBM platforms, make revers() machine dependent and use the RVS flag

of the different machines instead of a separate one.
For the C128, make the textcolor() function work in 40 and 80 column mode.


git-svn-id: svn://svn.cc65.org/cc65/trunk@1787 b7a2c559-68d2-44c3-8de9-860c34a00d81

libsrc/plus4/Makefile

@@ -46,6 +46,7 @@ OBJS =	_scrsize.o	\
         kuntlk.o        \
         randomize.o     \
 	readjoy.o	\
+        revers.o        \
 	tgi_mode_table.o
 
 all:	$(OBJS)

libsrc/plus4/cputc.s

@@ -8,7 +8,7 @@
     	.export		_cputcxy, _cputc, cputdirect, putchar
 	.export		newline, plot
 	.import		popa, _gotoxy
-	.import		xsize, revers
+	.import		xsize
         .import         PLOT
 
 	.include	"plus4.inc"
@@ -89,7 +89,7 @@ L11:	ora	#$40
 
 plot:	ldy	CURS_X
 	ldx	CURS_Y
-	clc                 
+	clc
 	jmp	PLOT		; Set the new cursor
 
 
@@ -98,7 +98,7 @@ plot:	ldy	CURS_X
 ; position in Y
 
 putchar:
-    	ora	revers	  	; Set revers bit
+    	ora	RVS             ; Set revers bit
        	ldy    	CURS_X
 	sta	(SCREEN_PTR),y	; Set char
 	lda	CHARCOLOR

libsrc/plus4/plus4.inc

@@ -15,6 +15,7 @@ SECADR		= $AD	     	; Secondary address
 DEVNUM		= $AE	     	; Device number
 FNAM_ADR        = $AF           ; Pointer to filename for OPEN
 KEY_COUNT      	= $EF 	     	; Number of keys in input buffer
+RVS             = $C2           ; Reverse flag
 CURS_X		= $CA  		; Cursor column
 CURS_Y		= $CD  		; Cursor row
 SCREEN_PTR	= $C8  		; Pointer to current char in text screen

libsrc/plus4/revers.s

@@ -0,0 +1,27 @@
+;
+; Ullrich von Bassewitz, 07.08.1998
+;
+; unsigned char revers (unsigned char onoff);
+;
+
+      	.export		_revers
+
+        .include        "plus4.inc"
+
+.proc   _revers
+
+	ldx    	#$00		; Assume revers off
+	tay			; Test onoff
+	beq	L1		; Jump if off
+	ldx	#$80		; Load on value
+        ldy	#$00		; Assume old value is zero
+L1:     lda    	RVS             ; Load old value
+	stx	RVS             ; Set new value
+	beq	L2		; Jump if old value zero
+	iny			; Make old value = 1
+L2:	ldx	#$00		; Load high byte of result
+	tya			; Load low byte, set CC
+	rts
+
+.endproc
+