The Sony STR DH100 is the cheapest receiver in its entire class but offers an alternative to high price surround system.
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The Sony STR-D715 is a stereo receiver. What code you use will depend upon the brand of the remote you are trying to program. There isn't one number that works with every remote. Try all the Sony Receiver codes for your remote as listed in the remote's manual. If they don't work, it seems this model may be too old to be supported.
The STR-212 is a stereo receiver made by Sony in the late 80's and early 90's. It is not a home theater receiver, as it has no video switching capability, no digital inputs/outputs and only supports stereo speakers (2 pairs, usually set up in 2 different rooms).
At the rear of the receiver there is a single RCA jack (phono socket) that is marked "audio out" and "sub-woofer". This is a mono feed that can be connected to a powered sub bass unit. It will not drive an un-powered bass speaker that does not have an internal amplifier. If the bass speaker is not powered, the audio out from the receiver can be taken to a single channel of another amplifier and the bass speaker then connected to the speaker output of the amplifier.