My guess is that the Captain Sim model is either based on the earliest versions of the 737-200ADV, that may have been the Boeing "standard" model without any of the airlines options added, OR, based on a 737-200ADV that Captain Sim had access to and so that is what we got.

Seeing as SP 177 autoflight system became available late 1970’s as an option, while SP 77 remained available until at least 1985 it seems unlikely that we will get the 177 in the CS 737-200ADV. I have to admit that I thought that the -200ADV came with the Sperry 177 right from the very first models. I was wrong. Mind you, it'd be nice if... they added it. But if they don't, I can live with the way it is.

Mark