Data General Service ECLIPSE MV/7800 - System Control Program (SCP); Remote Diagnosis

the system will then proceed with loading the system microcode. If a failure occurs, a portion of word "PASSED"
will not be printed, instead the message:
will be printed, where the "X" defines the failure as:
o
- uSeq chip, part no 3201
1 - CPU chip, part no 3200
2 - MCU chip, part no 3412
3 - kernel memory (first 256k)
7 - main PCB memory (except first 256k)
8 - expansion memory board
9 - FPU chip, part no 3203
after printing the error message the system will attempt to enter the SCP prompt.
3.3.4 System Control Program (SCP)
The system control program (SCP) is a utility that runs in the 8031 microprocessor and allows the system operator
to control the ECLIPSE MV/7800 computer system. The SCP is comprised of a macroinstruction program that
resides in 8031 EPROM memory, microcode support, and associated hardware. With the SCP, an operator can
examine and modify memory locations and internal registers, load software from an I/O device, and start and
control programs. The operator performs these functions by entering commands of the SCP Command Line
Interpreter (SCP-CLI) on the system console or terminal with remote access to the SCP.
The SCP-CLI is invoked under the following conditions:
•
At system power-up (if autoboot is not selected).
•
When the front panel console RESET switch is pressed.
•
When the BREAK key is pressed on the system console.
•
When the operator of a terminal that has remote access to the SCP enters the SEND BREAK command
(<BREAK> B).
•
When the CPU executes a HALT instruction as it does when AOS/VS or AOS/DVS is brought down.
3.3.5 Remote Diagnosis
The ECLIPSE MV/7800 computer implements the COMSWITCH-II command set. By issuing commands to the
DRP, traffic between the DRP ports is controlled and routed, enabling the remote user to control the ECLIPSE
MV/7800 computer without actually being on site. The DRP employs the concept of patch-panels, implemented
in a firmware switching PAL, to control the routing of the serial traffic to and from the various ports. The setting
of this switching PAL is affected by COMSWITCH-II commands, access-level, modem sequences, etc.
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