There is a talk on the ICL Comet (it’s a COMAL machine) based on the concept of the book on YouTube:
Another of Mike’s videos, the ICL Comet 8 here looks utterly unlike an orange box. It’s teal, for a start… but it runs CP/M and COMAL.
But here’s the orange Comet, in a teardown video
Here’s a wiki page (in Danish)
ICL Comet - DDHFwiki
Back in 1995, I were doing some education (computing) in the Danish city called Sønderborg (sonderburg in german). And we had to do basic programming on a Comet. However. There were rumours, that the graduating class at that time, had managed to get a Linux kernal running on a Comet. But yeah. I remember traking classes in computer architecture and programming, were the Comet were used as the example. I am not going to say that I think it is a bad machine, but I remember being happy to move to X86 Assembler instead.