coco3: reset vert scroll reg on boot.

diff --git a/Kernel/platform-coco3/coco3.s b/Kernel/platform-coco3/coco3.s
index cde88c3..1a52ba3 100644 (file)
--- a/Kernel/platform-coco3/coco3.s
+++ b/Kernel/platform-coco3/coco3.s
@@ -142,6 +142,7 @@ b@  sta     ,x+
        decb
        bne     b@
         ;; set temporary screen up
+       clr     $ff9c           ; reset scroll register
        ldb     #%01000100      ; coco3 mode
        stb     $ff90
        ;; detect PAL or NTSC ROM