Chapter 2. System Board Features
Super Input/Output Controller
Control of the integrated input/output (I/O) ports, diskette drive, and real-time clock is provided by the
National Semiconductor PC87307 chip. This chip, which is compatible with
Plug and Play ISA
Specification 1.0a, supports and implements the following features:
Diskette interface
Parallel port
Serial ports
Keyboard and mouse ports
General-purpose I/O ports
Real-time clock
Diskette Interface
IntelliStation M Pro computers support a maximum of two diskette drives. (Refer to “Internal Drives” on
page 24 for more information). The following is a list of devices that the diskette interface will support:
1.44 MB, 3.5-inch diskette drive
1.44 MB, 3.5-inch, 3-mode drive for Japan
1 Mbps, 500 Kbps, or 250 Kbps internal tape drive
Note: A 2.88 MB, 3.5-inch diskette drive is not supported.
The following table shows the typical system resource assignments for the diskette interface.
When the computer is started, the resource assignments are subject to change during POST.
One shrouded, 34-pin, berg-strip connector is provided on the system board for the diskette drive. For
information on connector pin assignments, see “Diskette Drive Connector” on page 43.
Table 2. System Resource Assignments for the Diskette Interface
Resource
Resource Assignment
ROM
None
RAM
None
I/O Address (Hex)
03F0–03F5 (diskette channel 0)
03F7, bit 7 (diskette change)
IRQ
6
DMA
2
12
Technical Information Manual
