NEC Xen Master System Hardware Manual page 169

System Hardware Manual
5.1.3 LED Indications
The front edge of the ETU has 13 LEDs. (Refer to Figure
5-3 ACD(8)-U10 ETU.) LEDs CH1~CH8 indicate the port
status as follows:
✆
On
✆
Off
1 The Live LED is red if ETU is receiving power.
1 The MB LED indicates the status of the MB switch.
1 The DOS (BIOS) LED is red if a BIOS error has
occurred.
1 The Bicolor (BCLR) LED indicates application status
as follows:
✆
Red
✆
Green
✆
The hard disk drive (HD) LED flashes red when HDD
is active.
Note: Do not reset the ETU while the HD LED is flashing.
5.1.4 Connectors
The ACD(8)-U10 ETU has the following connectors:
✆
J9
✆
9-pin RS-232(COM1)
Local Serial connector on main ETU for direct
connection.
5.1.5 Installation Precautions
The ETUs used in this system make extensive use of CMOS
technology that is very susceptible to static electricity. Static
discharge must be avoided when handling ETUs. Always
use the following precautions:
✆
Wear a grounding strap anytime you handle the ETU.
✆
Make all ETU DIP switch setting changes before
inserting it in the KSU. Ensure that Make Busy switch
is off.
✆
Carry ETU in a conductive polyethylene bag to
prevent static electricity damage.PBR( )-U13 ETU
Port Busy
Port idle or not used
DOS started (ACD application not ready)
ACD application is running
Connects to the backboard
May 2001
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