Acrosser AR-B1320 - Manual (Page 10)

A A R R - - B B 1 1 3 3 2 2 0 0 U U s s e e r r ’ ’ s s G G u u i i d d e e
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2.3 DRAM CONFIGURATION
There are two 16-bit memory banks on the AR-B1320 board. The first bank is embedded with a
1MBx16-bit (2MB, 60ns) EDO RAM and the other is 42-pin SOJ socket for extra 2MB DRAM with
1MBx16-bit (2MB, 60ns) EDO RAM. Please refer to the following table for details:
U15 (On-Board) U1 (Socket) Total Memory Remark
EDO 1Mx16 None 2MB Factory Preset
EDO 1Mx16 EDO 1Mx16 4MB
2.4 I/O CONTROLLER
A super I/O chip (SMC37C669) is embedded at the back panel of the AR-B1320 board. It
combines the functions of a floppy disk drive adapter, a hard disk drive (IDE) adapter, two serial
(with 16C550 UART) adapters and 1 parallel adapter. Setting the BIOS setup program can do the
I/O port configurations.
As a UART, the chip supports the serial to parallel conversion on data characters received from a
peripheral device or a MODEM, and the parallel to serial conversion on data character received
from the CPU. The UART includes a programmable baud rate generator; complete MODEM
control capability and a processor interrupt system. For the parallel port, the SMC37C669
provides the user with a fully bi-directional centronics-type printer interface.