GE IS200LSGIH1A Turbine Control Board

Description

GE General Electric Technical Specifications: IS200LSGIH1A

The 256 x 8 PROM IS200LSGIH1A can be visualized as four separate 64 x 8

blocks. The two most significant input pins to the PROM (A6

& A7) determine which of the four blocks you will be

operating in. The lower six input pins (AO through A5) are

connected to A 10 through A 15 of the Address Bus.

Because it takes address IS200LSGIH1A lines (AO through A 10) to address

1024 memory locations, the A 10 through A 15 address

lines will split memory into multiples of 1024 (1 K bytes).

Each location in the PROM represents a 1 K boundary. This

is ideal case since we have 64 bytes in each section; each

byte will decode a 1 K boundary, and we wish to decode a

64K memory map.

This can be IS200LSGIH1A verified by comparing this table data to the data

found in the MK6289 listing. (The shipped PROM is

configured for slow devices, ie wait states are inserted.)

(All selected memory is off-board)

The data to be entered into the PROM is computed by the

chart in Table 3. The signal to enable a particular socket is

an active low signal. This is indicated by the bar over the

signal name (lCS1 etc.) To select the first socket U7, a 0

(low) is the desired condition from output bit O. Output Bits

1-6 will be 1 ‘s to ensure that only one socket is selected at a

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