Serial Port Interface; Real Time Clock And Cmos Ram; Keyboard And Mouse Connectors - AXIOMTEK SBC82621 User Manual

SBC82621 Socket370 Half-size All-in-One CPU Card User's Manual

2.4.4 Serial Port Interface

The serial interface onboard SBC82621 consists of COM1 port
supports RS-232
connectivity.
2.4.4.1 Serial Ports IRQ Selection
SBC82621 uses two 10-pin connectors for COM2 (COM2) and
COM1 (COM1). Interrupt Requests on COM1 and COM2 are
selected via IRQ4 and IRQ3 respectively. Additionally, both
ports can be enabled or disabled via BIOS setting. The RS-232
pin assignments for COM1 and COM2 along with the RS-485
pin assignments for COM2 are in Appendix B.

2.4.5 Real Time Clock and CMOS RAM

The SBC82621 contains VT82C686B Integrated Real Time
Clock (RTC) and 128 bytes of CMOS RAM. The CMOS RAM
stores the system configuration information entered via the
SETUP program. A battery, with power lasting 10 years, keeps
the stored information on the RTC and CMOS RAM active
when system power is turned off.

2.4.6 Keyboard and Mouse Connectors

The SBC82621 provides a keyboard (CN9) and mouse (CN10)
interface with a 5-pin connector. CN7 is a DIN connector for
PS/2 keyboard and mouse connection.
Jumpers and Connectors
and COM2 provide
CN9/CN10
Clock 1
Data 2
No Connection 3
GND 4
Power
5
RS-232/422/485
19