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Controller command structure – Rana Systems Elite Series User Manual

Page 176

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ELITE SERIES USER MANUAL

THEORY OF OPERATION

of the EPROM and the serial to parallel convert-

er are controlled to insure that no contention

ever occurs on the bus.

7 . 2 . 9 . C o n t r o l l e r C o m m a n d S t r u c t u r e

The Elite Controller Card responds to three

types of commands. The first type is the device

command, characterized by bringing the DEV line

low as shown in the following table. (See the

Apple II Reference Manual for an explanation of

the DEV line.)

Slot

Memory Address for DEV

0

(not allowed)

1

$C090—$C09F

2

$C0A0-$C0AF

3

$C0B0-$C0BF

4

$C0C0-$C0CF

5

$C0L0-$C0DF

6

$C0E0-$C0EF

7

$C0F0-$C0FF

F i g . 7 - 3 : D E V L i n e A d d r e s s R a n g e s

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