Meiko Computing Surface CS-2, Руководство пользователя

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S1002–10M128.02
4
If either the front panel connections or the backplane connections are used, or no
devices are attached at all, then the on-board termination must be turned on. Only
when both front-panel and backplane connectors are used together should the on-
board termination switches be turned off, and in this case the SCSI bus must be
terminated at both ends.
External Indicators
Two LEDs (one green, one amber) are included on the front panel. The green
LED is the heart beat from the board’s CAN controller. The amber light illumi-
nates each time the CAN controller transmits on the CAN bus. Both should flash
steadily. These indicators are also displayed on the module’s LED display.
The green LED flashes at a slow steady rate (once per second) when operating
normally. A quicker flash rate (2
×
normal) indicates that the SPARC processor is
not responding; a very quick flash rate (3
×
normal) indicates that the H8 proces-
sor on the module controller is not responding.
Each processor board within a processor module controls a 4
×
4 matrix of red
LEDs on the module’s front panel. The MK401 displays a random pattern on
these when running the Boot ROM. When Solaris has been booted a circulating
pattern is displayed. The pattern can be changed by user programs.
MK405 Quad-SPARC Board
Field Upgradeable Components
The MK405 has the following field upgradeable components (see Figure 4-4):
•
Superscalar SPARC processor modules fitted to MBus slots.
•
16 memory slots.
•
Boot ROMs.
•
H8 ROMs.
•
Non-volatile RAM (NVRAM).