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C00002 00002 The Joe Zinghiem Turn Table Hardware has three PDP-6 IOTS:
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The Joe Zinghiem Turn Table Hardware has three PDP-6 IOTS:
DATAI 410,X
Reads a word into memory location X. Bit 18 of the word is
the count invalid bit. Bit 19 of the word is the first BCD digit of
a 5 digit number. Bits 20 thru 35 are four four-bit BCD bytes.
Thus the BCD turn table position count can assume values from =00000
to =19999. As the turn table moves in the counter clockwise (as
viewed from above the plane of the hand eye table) the position
count decreases.
CONO 410,0
Resets turn table count to zero when it moves thru a position
exactly divisible by =200; that is there are =10 potential turn table
origins. The turn table count must be reset when the count invalid
bit comes on.
DATAO 500,[XWD 5,<speed>]
This iot sends a command word to the turn table. The left
half of the command word must contain the integer five to select the
turntable. The right half contains a number called the "speed". If
the speed is between 000000 and 000077 octal the turntable
physically moves counter clockwise, slow to fast respectively. A
speed of 10 to 20 is required to overcome standing friction when
starting; a speed of 4 usually succumbs to moving friction. Speeds
from 000176 to 000100 octal cause the turntable to move (slow to
fast) in the clockwise direction (increasing the position counter).
The 200 bit causes the turn table to time out. The speed 000177
causes the turn table motor to lock.
TURNTABLE HARDWARE:
The turn table has a manual lock switch on the far side of
the hand eye table which must be released before the turn table is
used. Joe Zingheim should be consulted if the turn table does not
seem to work.