? Al K has read hundreds of these Whirlwind tapes using a standard 8-track optical reader, so I think we can confirm that it is punched with the common geometry, except one track narrower, with four bits on one side of the sprocket holes, and three bits on the other. ? The tapes are for pedagogical purpose, so if I can punch on inch-wide tape and perhaps trim the width later, that works just fine. Thanks all! ?/guy Date: Fri, 26 Mar 2021 16:01:38 -0700 From: Al Kossow <aek at bitsavers.org> To: cctalk at classiccmp.org Subject: Re: punching paper tape Message-ID: <f52af974-dbc4-0a51-409e-b4cc2b9076e9 at bitsavers.org> Content-Type: text/plain; charset=utf-8; format=flowed On 3/26/21 2:58 PM, Steve Malikoff via cctalk wrote: the best picture i have at hand of what a ww tape looks like is on the right of http://bitsavers.org/bits/MIT/whirlwind/X4222.2008_Whirlwind_ptp/pictures/s… you can see it is narrower by one punch than a normal 8-channel tape