diff --git a/src/libsrc/dgr.pla b/src/libsrc/dgr.pla
index aac54ff..8383bbf 100755
--- a/src/libsrc/dgr.pla
+++ b/src/libsrc/dgr.pla
@@ -24,6 +24,16 @@ const ena80        = $C07F
 const page1        = 0
 const page2        = 1
 //
+// Screen row address arrays.
+//
+word[] dgr1rows     = $0400,$0480,$0500,$0580,$0600,$0680,$0700,$0780
+word                = $0428,$04A8,$0528,$05A8,$0628,$06A8,$0728,$07A8
+word                = $0450,$04D0,$0550,$05D0,$0650,$06D0,$0750,$07D0
+word[] dgr2rows     = $0800,$0880,$0900,$0980,$0A00,$0A80,$0B00,$0B80
+word                = $0828,$08A8,$0928,$09A8,$0A28,$0AA8,$0B28,$0BA8
+word                = $0850,$08D0,$0950,$09D0,$0A50,$0AD0,$0B50,$0BD0
+word[] dgrbuff      = @dgr1rows, @dgr2rows
+//
 // Color mapping.
 //
 byte[] evnclr = $00,$88,$11,$99,$22,$AA,$33,$BB