This article is from the RCA SelectaVision VideoDisc FAQ, by tom@cedmagic.com (Tom Howe) with numerous contributions by others.
The SGT250 (as well as the SJT300, SKT300, and JCPenney 686-5705) used
an analog infrared remote whose signal was decoded on the basis of its
frequency. Most universal remotes use digital infrared signals, which
these models of CED players can't decode. So even if you have a
trainable universal remote, it still won't be able to understand the
signals from the VideoDisc remote. In contrast, the SJT400 and SKT400
players use remotes that were among the first devices to conform to the
current digital IR standard, so the functions of these remotes can be
programmed into a universal remote. The RCA Digital Command Center was
an alternative remote available for the 400 series players that was also
capable of controlling RCA TV's and VCR's conforming to the digital IR
standard. Thomson Consumer Electronics hasn't changed the code mapping
on the RCA TV's and VCR's they currently manufacture, so the 1983
Digital Command Center can still be used to control these devices. There
is also a program available for download at the CED Magic web site that
permits a Palm Organizer to be used as a 400 series player remote.
 
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