New target c16

git-svn-id: svn://svn.cc65.org/cc65/trunk@1563 b7a2c559-68d2-44c3-8de9-860c34a00d81

libsrc/c16/cgetc.s

@@ -0,0 +1,88 @@
+;
+; Ullrich von Bassewitz, 06.08.1998
+;
+; char cgetc (void);
+;
+
+       	.export		_cgetc
+       	.import		cursor
+
+       	.include	"../plus4/plus4.inc"
+
+
+; --------------------------------------------------------------------------
+
+_cgetc:	lda	KEY_COUNT 	; Get number of characters
+       	ora	FKEY_COUNT	; Or with number of function key chars
+       	bne	L2	  	; Jump if there are already chars waiting
+
+; Switch on the cursor if needed
+
+       	ldy	CURS_X
+       	lda	(CRAM_PTR),y	; Get current char
+       	pha		  	; And save it
+       	lda	CHARCOLOR
+       	sta	(CRAM_PTR),y
+
+       	lda	cursor
+       	beq	L1	    	; Jump if no cursor
+       	tya
+       	clc
+       	adc	SCREEN_PTR
+       	sta	TED_CURSLO
+       	lda	SCREEN_PTR+1
+       	adc	#$00
+       	sbc	#$0B	  	; + carry = $C00 (screen address)
+       	sta	TED_CURSHI
+
+L1:    	lda	KEY_COUNT
+       	ora	FKEY_COUNT
+       	beq	L1
+       	pla
+       	sta	(CRAM_PTR),y
+       	lda	#$ff
+       	sta	TED_CURSLO	; Cursor off
+       	sta	TED_CURSHI
+
+L2:    	jsr    	KBDREAD	       	; Read char and return in A
+       	ldx	#0
+       	rts
+
+; --------------------------------------------------------------------------
+; Make the function keys return function key codes instead of the current
+; strings so the program will see and may handle them.
+; Undo this change when the program ends
+
+	.constructor	initkbd
+	.destructor	donekbd
+
+.proc	initkbd
+
+     	ldy	#15
+@L1:  	lda	fnkeys,y
+     	sta 	FKEY_SPACE,y
+     	dey
+     	bpl	@L1
+     	rts
+
+.endproc
+
+
+.proc	donekbd
+
+     	ldx    	#$39		; Copy the original function keys
+@L1:  	lda    	FKEY_ORIG,x
+     	sta    	FKEY_SPACE,x
+     	dex
+     	bpl    	@L1
+     	rts
+
+.endproc
+
+
+; Function key table, readonly
+
+.rodata
+fnkeys:	.byte	$01, $01, $01, $01, $01, $01, $01, $01
+     	.byte	133, 137, 134, 138, 135, 139, 136, 140
+