NEC POWERMATE PROFESSIONAL 9000 Service Manual page 28

1-10 Technical Information
Table 1-2 System Board Feature Components
Chip
National PC97307 Super I/O
controller
Function
The 1 x 2-pin chassis security header (J0A1)
can be connected to a normally-open
mechanical switch on the chassis. See
Appendix A, "Connector Pin Assignments" for
the location and pinouts of the chassis security
header.
The PC97307 Super I/O controller is an ISA
Plug and Play compatible multifunction I/O
device that provides the following features.
Serial ports:
Two 16450/16550A-software compatible
UARTs
Internal send/receive 16-byte FIFO buffer
Four internal 8-bit DMA options for the
UART with SIR support (USI)
Multimode bidirectional parallel port:
Standard mode: IBM and Centronics
compatible
Enhanced parallel port (EPP) mode with
BIOS and driver support
High-speed extended capabilities port
(ECP) mode
Floppy disk controller:
DP8473 and N82077 compatible
16-byte FIFO buffer
†
PS/2 diagnostic-register support
High-performance digital data separator
(DDS)
PC-AT, PS/2, and 3-mode floppy disk
drive-mode support