initial commit from old source

libsrc/c128/cpeekchar.s

@@ -0,0 +1,74 @@
+
+		.export _cpeekchar
+		.export _cpeekcharxy
+
+		.import _gotoxy
+
+		.import plot,popa
+
+
+		.include	"zeropage.inc"
+		.include	"c128/c128.inc"
+
+	.segment "CODE"
+
+_cpeekcharxy:
+
+	jsr	_gotoxy		; Set cursor
+
+_cpeekchar:
+
+	lda MODE
+	bmi @c80
+
+   	ldy CURS_X
+	lda (SCREEN_PTR),y	; get char
+
+@return:
+	; convert to asc
+	and #$7f
+
+	;   0 - $1f +$40
+    ; $20 - $3f
+	; $40 - $7e +$80
+
+	cmp #$1f
+	bcs @sk1
+;;	clc
+	adc #$40
+	rts
+
+@sk1:
+    cmp #$40
+	bcc @end
+	clc
+	adc #$80
+@end:
+    ldx #0
+	rts
+
+@c80:
+	lda SCREEN_PTR
+	ldy SCREEN_PTR+1
+	clc
+	adc CURS_X
+	bcc @s
+	iny
+@s:
+	; get byte from vdc mem
+	ldx	#VDC_DATA_LO
+	stx	VDC_ADDR_REG
+@L0:	bit	VDC_ADDR_REG
+	bpl	@L0
+	sta	VDC_DATA_REG
+	dex
+	tya
+	stx	VDC_ADDR_REG
+	sta	VDC_DATA_REG
+
+	ldx	#VDC_DATA_RW
+	stx	VDC_ADDR_REG
+@L1:	bit	VDC_ADDR_REG
+	bpl	@L1
+	lda	VDC_DATA_REG
+    jmp @return