The name is absent



117

In order to pass a number to the Power Control Lines, it is converted into binary
and the digits are passed to the serial data input of the shift register (Ds) from pin 2 of
the parallel port. The chip is signaled to input a bit at each digit through the shift
register clock input (SHcp) from pin 4 of the parallel port. After the shift register has
been filled the storage register clock input (STcp), connected to pin 5 of the parallel, is
signaled to send the contents of the shift register to the output latches, which connect
to the Power Control Lines of the TMS. Figure 3 shows an example of setting the power
level to 83%.

9TX>,r>'>?   7∙∕7∙W∙>n

Register    '   '      ∣             ∣

Output  9¾99<pw' I ∙>'>γγy??? ∣

Latdies   ....... ∣.....∣

DS        !

??????oi '
I

τt'>m'n '

' I

777770101
I

77777777 1
I

77770∣01 *
I

777777TJ I
I

77701010 1 77010100 '

I                      1

77977777 ∣ γHTTΓH '

.. .... ι -. ι

I

I

70101001 OlOIObll *

I                      I

ТУГУГУТ} I .             I

.......       I......I

__________J___________

oιoιooιι ' 00000000
I

01010011 1 01010011

I

I

___________________________I_____________________________

I

I

ΓTr^πT.......,...Γ.....Γ∣Γ.ΓΓΓΓ.ΓΓΓΓΓΓΓΓΓ,,.,.,,.,.,l

I                           I

I

Γ         I

I

I

I

I

SHcp ;n ;

----------- I

---------------- I
I______L

------------- I

_____L

-- I — I
LjJ Li

------------ I -------------

I

I

I                           I

ST          1        1

blCP        I        I

_

I
I

I

I

I

_______L

I

I
I

I                           I

I                           I

__________________________I                           I

I                      I

I                      I

I                           I

I

~~]  1

I

I                           I

MR        1      <

_____________________ I__________________ I

I
I
______________I

I

I
__________L

I

I
____________L

I                           I

I                           I

_________ I_______________L

I                           I

I                      I

.....             I____________ ⅜

I

lΓ~l

_____________________11 I

I1                  1 1 rι ∙∙t

I                      l

-------------,
I

.............  1"

I

..............  T

I

--------------------------1                           I

I                           I

,"          1 1 J1 ■........... I

I                      l

1 Ir          v ■

I

Figure 3 Control diagram of the control box. This example shows the steps to set the TMS strength to
83%, or 010100112 in binary. The inputs Ds, SHcp, STcp, and MRcorrespond to pins 2,4,5,and 6 of the
computer's parallel port when connected.

Bypassing safety systems for manual control and adding safety systems for computer
control



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