diff --git a/Source/HBIOS/std.asm b/Source/HBIOS/std.asm
index 28a2d905..4de1147b 100644
--- a/Source/HBIOS/std.asm
+++ b/Source/HBIOS/std.asm
@@ -283,6 +283,7 @@ DMAMODE_Z280	.EQU	3		; Z280 INTEGRATED DMA
 DMAMODE_RC	.EQU	4		; RCBUS Z80 DMA
 DMAMODE_MBC	.EQU	5		; MBC
 DMAMODE_DUO	.EQU	6		; DUO
+DMAMODE_VDG	.EQU	7		; VELESOFT DATAGEAR
 ;
 ; KEYBOARD MODE SELECTIONS
 ;