creativision/crt0.s: enable display interrupts in display controller configuration

Otherwise the joystick zero page locations won't get updated.

diff --git a/libsrc/creativision/crt0.s b/libsrc/creativision/crt0.s
index 6faec38ebf0eee3db4caea7de347822cf363ee48..420ac71ef93578a8ae185b27990f6039dade4b80 100644 (file)
--- a/libsrc/creativision/crt0.s
+++ b/libsrc/creativision/crt0.s
@@ -81,7 +81,7 @@ irq2:   jmp     BIOS_IRQ2_ADDR
         ; VDP Setup
         ; This sets to Graphics Mode 1
         .byte   $00             ; Register 0
-        .byte   $C0             ; Register 1 16K RAM, Active Display, Mode 1
+        .byte   $E0             ; Register 1 16K RAM, Active Display, Mode 1, VBI enabled
         .byte   $04             ; Register 2 Name Table at $1000 - $12FF
         .byte   $60             ; Register 3 Colour Table at $1800 - $181F
         .byte   $00             ; Register 4 Pattern Table at $0000 - $07FF