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 and COM2 provide RS-232/422/485
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.
CN9/CN10
Clock
Data
No Connection
GND
Power
1
2
5
4
3
Jumpers and Connectors
19
