Notes:
So now that we have the historical context, let's look at the Rosetta code in detail. The listing is over 40 years old - which is a lot in computer years.
As I mentioned, the code on the left is the assembly instructions for the Gier. The portions on the left enclosed in square brackets and the portions on the right following the semicolon, as indicated by the green line; are comments - that is they are ignored by the computer and they are there only for the human reader.
So, even though the code on the right looks like a computer program, it is really not, it is called pseudo code and it serves to explain what the real code on the left is doing - so ostensibly we have two descriptions of the same algorithm at hand - a Rosetta code. The care and craftsmanship that went into these comments, let alone the code is truly amazing. It is especially amazing if you consider the sheer difficulty of editing the code on a ten character per second Flexowriter, using 8 level paper tape that is copied as the edits are made in sequence.