Siemens T100 Terminal with Paper Tape - Available

Mike Katz bitwiz at
Wed Dec 8 15:00:57 CST 2021

correction old age, arthritic fingers and old age?

On 12/8/2021 2:57 PM, Mike Katz via cctalk wrote:
> You are correct, I counted wrong.  Can I chalk it up to old date and 
> bad eyes😁?
> On 12/8/2021 1:52 PM, Paul Koning wrote:
>> No, it's 5 bit tape.  2 data bits, transport sprocket holes, 3 data 
>> bits -- top to bottom on the reader (right side), left to right on 
>> the punch (left side).
>> DEC PDP-10 systems used six bit code internally but I don't remember 
>> those appearing on punched tape.  The punched tape machines I have 
>> seen with 6 channels are typesetting devices, from early tape 
>> operated Linotype machines (1940s vintage) to 1960s or 1970s era 
>> phototypesetters.  Those are upper/lower case.
>>     paul
>>> On Dec 8, 2021, at 2:23 PM, Mike Katz <bitwiz at> wrote:
>>> I thought I had recalled that Baudot was 5 bits but the paper tape 
>>> is 6 bits across and I don't know of any 6 bit character codes 
>>> except for DECs upper case only character set and even their paper 
>>> tape had 8 bits so I guessed Baudot.
>>> On 12/8/2021 1:16 PM, Paul Koning wrote:
>>>> 5 bit; if it really were 6 bits it would typically be typesetting 
>>>> codes.
>>>> That's a relative of the machine used as console terminal on Dutch 
>>>> Electrologica X8 computers; I recognize the "Iron cross" symbol, 
>>>> the figures shift character on the D key. But some of the other 
>>>> function codes have different labels so it isn't actually the same 
>>>> model.
>>>> The description I have says that the X8 console used CCITT-2, 
>>>> a.k.a., Baudot, code but with the bit order reversed.  And also 
>>>> that it used the all-zeroes code as a printable character rather 
>>>> than as non-printing fill.
>>>>     paul

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