VL-601 BIOS Update

PCB: 1.3 
Version: IV612 (iv612.rom)
Date: August 24, 1998
Flash file: Flash642.com
Fixes: 
1. Added support for Keyboard Power-On & Mouse Power-On (models with 977TF-AW I/O chip only).
2. Note: VL-601 PCB1.3 has two types of I/O chip: Super I/O 977EF-AW & 977TF-AW