From 3abf7993ce2d2deb1c0596f3404b2bfa27324564 Mon Sep 17 00:00:00 2001
From: "B. Watson" <yalhcru@gmail.com>
Date: Wed, 17 Feb 2016 23:47:59 -0500
Subject: make the cursor behave *much* better, via custom conio function

---
 conio/cvline.s | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 conio/cvline.s

(limited to 'conio/cvline.s')

diff --git a/conio/cvline.s b/conio/cvline.s
new file mode 100644
index 0000000..7ff56c3
--- /dev/null
+++ b/conio/cvline.s
@@ -0,0 +1,38 @@
+;
+; Ullrich von Bassewitz, 08.08.1998
+;
+; void cvlinexy (unsigned char x, unsigned char y, unsigned char length);
+; void cvline (unsigned char length);
+;
+        .include "atari.inc"
+        
+        .export         _cvlinexy, _cvline
+        .import         popa, _gotoxy, putchar
+        .importzp       tmp1
+
+.ifdef __ATARI5200__
+CHRCODE =       1               ; exclamation mark
+.else
+CHRCODE =       $7C             ; Vertical bar
+.endif
+
+_cvlinexy:
+        pha                     ; Save the length
+        jsr     popa            ; Get y
+        jsr     _gotoxy         ; Call this one, will pop params
+        pla                     ; Restore the length and run into _cvline
+
+_cvline:
+        cmp     #0              ; Is the length zero?
+        beq     L9              ; Jump if done
+        sta     tmp1
+L1:     lda     COLCRS
+        pha
+        lda     #CHRCODE        ; Vertical bar
+        jsr     putchar         ; Write, no cursor advance
+        pla
+        sta     COLCRS
+        inc     ROWCRS
+        dec     tmp1
+        bne     L1
+L9:     rts
-- 
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