# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1542041753 -3600
# Node ID e7cf90210d941b89c889c9350b8f4289fb34ed90
# Parent  c8bb3228030dcbe7455dc88e5b8de57da359f500
Noted the significance of replicating values in the VGA display structure.

diff -r c8bb3228030d -r e7cf90210d94 include/vga_display.h
--- a/include/vga_display.h	Sun Nov 11 22:23:40 2018 +0100
+++ b/include/vga_display.h	Mon Nov 12 17:55:53 2018 +0100
@@ -48,13 +48,18 @@
 
     int hsync_unit, vsync_unit;
 
-    /* Current scanline. */
+    /* Current scanline and pixel line. */
 
     uint32_t line;
+    uint8_t *linedata;
 
-    /* Screen start address, frame limit, current pixel line. */
+    /* The start, limit and size of the screen are copied to this structure,
+       allowing the display configuration to use different values such as those
+       for a different display frame. */
 
-    uint8_t *screen_start, *screen_limit, *linedata;
+    /* Screen start address, frame limit. */
+
+    uint8_t *screen_start, *screen_limit;
 
     /* Screen size, used to wrap the current line pointer. */