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I am reading the article about the CP/M operating system and wonder which computers are displayed in this picture. I have recognized the "IBM PC" only - in the middle.
From left to right:
DEC VT100 family terminal, which may have been connected to some other system or in VT180 form, which was a VT100 with a card that turned it into a standalone computer.
IBM PC 5150
Left-to-right it looks like a DEC VT125 1, IBM 5150, and NEC APC. One of the objects in the background appears to be an HP 7470A plotter (thanks to Mick for pointing that out).
1 The VT125 had color bitmap capability.
The right one looks like a NEC APC or N5200.
The middle, as you rightly say, is an IBM PC.
The left one, isn't even a computer - looks like a DEC VT100 terminal to me.
So, the computers in the picture would only run CP/M 86. No "classic" CP/M 80, unfortunately, and no CP/M 68k.
Required, but never shown