IBM 029 Card Punch and ASCII Machines

Johnny Billquist bqt at
Tue May 12 07:07:29 CDT 2015

On 2015-05-12 05:56, Eric Smith wrote:
> On Sun, May 10, 2015 at 1:06 PM, Johnny Billquist <bqt at> wrote:
>> I don't know how common card readers were, but I don't think any DEC
>> machines could punch cards.
> Almost all DEC machines up through early VAX supported card punch
> options. They just weren't very common other than on PDP-10.
> PDP-8: CP08
> PDP-10: CP10 (multiple variants) and CP20
> PDP-11 and VAX: CP11
> PDP-15: CP15
> (also earlier 18-bit machines, and maybe PDP-5, but I don't have
> definitive info on option numbers at hand)

Yes, and at least the PDP-8 and PDP-11 are read only.
The interesting question is if any could punch. Maybe the PDP-10 could, 
but I haven't heard of any other DEC machines that could.


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