Which paper tape hole is bit 1?

[woodelf]

Charles wrote:

>Today I was hooking up my homebrewed driver board to the M-series
>connector on the back of my Tally 420PR tape punch (interfaces to
>my 8/A and . Fortunately, before I inserted the eight data pins
>into the connector body it occurred to me that Tally and DEC might
>not interpret the holes in the same order. And indeed they don't!
>
>The paper tape has five holes on one side of the sprocket hole and
>three on the other. Typical DEC terminology is Bit 1 = MSB and Bit
>8 = LSB. Is that in fact how DEC labeled it?
>
>Is the MSB on the outside of the 5-hole side or the 3-hole side?
>Which hole on the tape is which?
>
>Even more interestingly, Tally labels their punch pins as follows:
>(* is the sprocket hole)
>
>8 7 6 1 2 * 3 4 5
>
>  
>
For the pdp-8  tty punch/reader
channels  8 7 6 5 4 * 3 2 1

>and I confirmed this by actual test. So much for consistency
><sigh>
>
>  
>
mind you as long as you only  punch/read your own paper tapes does it 
matter? :D

>-Charles
>
>  
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