Meiko Computing Surface CS-2, Руководство пользователя

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Installing Processor Boards
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4
Boot ROM
The boot ROMs may be upgraded from time to time.They are held in sockets and
are easily replaced using the appropriate tool.
H8 ROM
The H8 ROMs may be upgraded from time to time. They are held in sockets and
are easily replaced using the appropriate tool.
NVRAM
The non-volatile RAMs hold system configuration information, environment
variables, and the clock. They are held in a DIL sockets and are easily replaced.
Note however that the information within the NVRAM can only be restored by
Meiko’s engineers.
The NVRAM contains lithium batteries which have special handling and dispos-
al requirements — your attention is drawn to the precautions listed in the General
Precautions on page ii.
External Indicators
The MK405 front panel includes two pairs of LEDs. In the middle are two amber
LEDs — illumination of these indicates an error with the Elite switches. The
green/amber LED pair are the board’s CAN bus indicators — green is the board’s
heartbeat, and amber indicates a transmission onto the bus.
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. Each of the four processors on an MK405 con-
trols one row of 4 lights. Processor 0 controls the top row, processor 3 the bottom.