American Megatrends Super Voyager VLB-III, User Manual, Page: 14 / 138

Chapter 1 System Overview
8
Onboard I/O,
Continued
Onboard Local Bus IDE Support
The onboard IDE is on the VESA local bus. The IDE controller supports IDE Mode 0, 1, 2, and 3. It also
supports IDE read data prefetch and write posting. AMIBIOS supports 32-bit data transfers as well as the
following cycle times for each IDE Mode.
IDE Mode Cycle Time (in nanoseconds)
0 600
1 383
2 240
3 180
Fast ATA Support
This motherboard fully supports the Fast ATA specification. AMIBIOS automatically configures the IDE
hard disk drives that conform to the ATA specifications.
Onboard NS16550s
The motherboard has two National Semiconductor NS16550 UARTs for serial port, which provide
enhanced serial port features. The end user can enable FIFO for Serial ports 1 and 2 through Peripheral
Setup in WinBIOS Setup.
Floppy Drive Support
The motherboard supports up to two floppy drives, including 720 KB, 1.44 MB, and 2.88 MB 3½" drives
and 1.2 MB 5¼" drives.
Memory Addresses
The motherboard uses 32-bit memory addresses to access 4 gigabytes of memory address space on the VL-
Bus expansion slots. The ISA expansion slots use 16-bit memory addresses to access up to 24 MB.