Owner's manual

A
A
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R
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B
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1
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3
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2
0
0
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U
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r
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2-2
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 Memor
y
Remark
EDO 1Mx16 None 2MB Factor
y
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.