GE IS200STCIH6A communication module

Description

GE General Electric Technical Specifications: IS200STCIH6A

Designed as a system controller/diagnostics board, it

provides the IS200STCIH6A user with Reset/Interrupt lines to the CPU, as

well as the capability to run tests placed in EPROM on

board, to verify the operation of other MD boards on the bus.

The board is equipped with sockets to contain upto 10Kx8

of EPROM memory (5-2716’s) as shown in the Block

Diagram. The IS200STCIH6A EPROM’s can contain the diagnostic

programs necessary for testing the modules or can contain

user application programs.

The EPROM memories can be positioned to start on any 2K

boundary within a 16K block of memory via a strapping

option provided on the board.

For the 4MHZ version, circuitry is provided to force one wa it

state each time on-board EPROM’s are accessed.

A three-position switch is provided at the top of the board.

The IS200STCIH6A switch is spring loaded to the OFF position. The RESET

position initializes the hardware and software diagnostics

elements. The START position begins the diagnostic test

which had been preset by the thumbwheel switches, also

on the top of the board. At the conclusion of the test, the

results are displayed by the LED Readouts. Data transfers

from the switches to the bus and from the bus to the

readouts are accomplished by the MK3881 PIO.

The PIO also permits total IS200STCIH6A interrupt control so that full usage

of the CPU interrupt capabilities can be utilizEld during data

transfers. The PIO provides vectored interrupts and

maintains the daisy-chain, priority interrupt logic

compatible with the STD-Zao BUS.

The MDX-PFD board (MK77979) and voltage transformer

module provide for power-up/power-down sequencing for

use in conjunction with the battery backed MDX-BCLK and

MDX-BRAM boards. A block diagram is shown in Figure 2.

Figure 3 shows the MDX-PFD timing.

The Voltage Transformer Module is mounted separately

from the card cage containing the MDX-PFD board. Its

purpose is to provide a low voltage AC signal which is

derived from the 115/230 volt line supplying the main

system power.ltcontainsaterminal strip for 115/230VAC

power, a fuse, and a transformer. A cable and connector are

provided for connection to the MDX-PFD board.

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