diff --git a/src/ints/bios_disk.cpp b/src/ints/bios_disk.cpp
index bb12bb96..963b2e05 100644
--- a/src/ints/bios_disk.cpp
+++ b/src/ints/bios_disk.cpp
@@ -96,6 +96,7 @@ void incrementFDD(void) {
 		equipment|=(numofdisks<<6);
 	} else equipment|=1;
 	mem_writew(BIOS_CONFIGURATION,equipment);
+	if (IS_EGAVGA_ARCH) equipment &= ~0x30; //EGA/VGA startup display mode differs in CMOS
 	CMOS_SetRegister(0x14, (Bit8u)(equipment&0xff));
 }