There’s a picture of this on Ken Shirriff’s @kenshirriff site, along with the consoles of the other 360 models. In the 360/44 pic, the knob is the bottom one of the trio of knobs at the center left.

https://www.righto.com/2019/04/iconic-consoles-of-ibm-system360.html

There is a general description of this feature on the Wikipedia page:

https://en.wikipedia.org/wiki/IBM_System/360_Model_44

and fortunately it has a link to original source material on bitsavers:

https://bitsavers.org/pdf/ibm/360/functional_characteristics/A22-6875-5_360-44_funcChar.pdf (2/4)

@SteveBellovin @aka_pugs If you were on the non-EBCDIC side of the fence you got the impression that IBM sales pushed EBCDIC pretty hard as a competitive advantage - even if their engineering covertly preferred ASCII.

The 32-bit word must have been a harder-sell for the blue suits since the competition were selling 60bit and 36bit amongst other oddballs.

Fortunately the emergence of commercial customers marked the declining relevance of scientific computing... Did IBM get lucky or were they prescient?

But yeah, the S/360 definitely marked the end of the beginning of computing in multiple ways.

@aka_pugs Really was the beginning of the modern era of computing, starting with the normalisation of 8-bit bytes and character addressable architecture.

Well, that's all true so long as we don't mention EBCDIC 🙂