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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.