Table 4-1. Controls and Indicators (Cont'd)

T.O. 31S5-4-308-1

TM 11-5805-663-14-13

NAVELEX 0967-464-0010

FUNCTION

TYPE

NAME

Switch

through 15

Instruction Register

(Cont'd)

Firmware A

(address of last instruction)

Firmware B

(operand effective address)

Not assigned

Control Register

The selected register can be accessed by touching the

system reset or after power is turned on, register 0

is always selected.

Touching the switch turns on its indicator, and the

Touch response

address

data displayed on the data indicators is written

write

indicator switch

into the selected CPU or system processor address.

If done indicator remains on, access was

successful.

This indicator switch operates nearly the same as the

address

Touch response

read

indicator switch

displayed in the data indicators is read at the

address displayed by the address indicators.

The first touch of the switch does not increment the

address indicators before accessing the address.

However, all following successive touches of the

switch increments the address indicators by 2 be-

fore the access. Touching any other switch but the

switch prevents the address indicators from being

incremented prior to the access.

address 0

Touch response

The address switch indicators 0 through 15 select

through 15

indicator

the address to be accessed whenever the address

switches

read or write switch is touched. On indicators

represent binary ONES: off they represent binary

ZEROES. Each switch has toggle action, that is,

if the first touch of any switch turns the indicator

on, the second touch turns the indicator off, and

vice versa. After touching reset or after power is

turned on, the switch indicators are always cleared

to 0000 16.

4-4