SECTION 1
INTRODUCTION
This section describes Data General ECLIPSE MV/7800, model 8883, ECLIPSE MV/7800-C, Models 8884 and
8885 computers, and accessory Memory Expansion boards, Models 8900, 8901, and 8902. It provides a brief
introduction, model numbers, hardware description, software support, and lists of field replaceable units (FRUs).
In addition, this section also includes FRU information for the MV/7800-U, ECLIPSE systems that have been
upgraded. To upgrade a NOVA 4/X, 4/S, 4/C, S/120, or S/140 computer system to a MV/7800-U, see
MV/7800-U System Upgrade Product Information Package 043-000279.
1.1 OVERVIEW
The ECLIPSE MV/7800 and MV/7800-C computer systems are low cost, single-bus implementation of the 32-bit
MV architecture based on a Data General VLSI chip set mounted on a single 15 x 15-inch PCB. The ECLIPSE
MV/7800-U is an upgraded NOVA 41X, 4/S, 4/C, S/120, or S/140 using the same single-bus 32-bit MV
architecture that is used with the MV/7800 and MV/7800-C computer systems.
The ECLIPSE MV/7800 and MV/7800-C have superior I/O and Floating Point performance. The heart of these
systems is a chip set consisting of five VLSI circuits (Microsequencer, ALU/ATU, FPU, I/O, and a BMC) plus
one bipolar circuit. In addition to the chip set, there is either 2 or 4 megabyte of main memory, a gate array for
the implementation of ERCC and memory control, plus PIT, RTC and a Time of Day (TOD) clock.
The ECLIPSE MV/7800 and MV/7800-C computers use power-up and FRU diagnostics to detect and isolate
failures to the FRU level. The computer also supports remote diagnosis via internal COMSWITCH-II protocol.
In addition to the internal memory on the CPU PCB, an expansion memory PCB in the form of a daughter PCB to
the CPU is available as an option. The expansion memory PCB is offered in 2, 4, and 10 Mbyte increments. The
maximum ECLIPSE MV/7800 and MV/7800-C memory allowed for the CPU PCB plus the expansion memory is
14 megabytes. Only one expansion memory PCB can be used.
The system is fully compatible with other Data General peripherals (disks, tape drives, etc.) and supports all
languages operating under AOS/VS, AOS/DVS, and DG/UX operating systems.
1.1.1 MV/7800 Communications SWITCH-II Overview
The MV/7800 Communications Switch-II, resident on the MV/7800 15-inch by 15-inch PCB, is a
communications interface that is enabled at the customer's site for remote diagnosis of hardware and software
problems. The MV/7800 Communication Switch-II, will hereafter be called the COMSWITCH-II. The
COMSWITCH-II is functionally installed between the system console and the MV/7800 TTO/TTI port, and
between a user's terminal and the MV/7800 systems IAC port. This arrangement allows those functions normally
accessible only at the local system console to be available remotely, while also providing normal user activity. An
autodial modem is also connected to provide remote access to the COMSWITCH-II. The remote user can
control the customer's MV/7800 computer system without actually going on site by issuing commands to
DGC
CONFIDENTIAL - INTERNAL USE ONLY
1-1
043-003621
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