Acrosser Technology AR-B1320 CPU, Руководство пользователя

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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 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.