GM has upgraded the Dexron specifications over the years; newer fluids are generally but not always backward compatible with previous fluids.
Though Bethesda now utilizes a newer version to create official plug-ins for Oblivion, the two Morrowind and Oblivion versions are not backwards compatible.
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Upstream Tracker is a web service providing analysis of API changes from the backward compatibility point of view for a variety of C/C++ and Java libraries.
In order to retain full forward and backward compatibility, the size of the data frame exchanged between the network master (Scanners and Gateways) was not increased.
2012: Osamu Kumagai, Sony Corp., “Multi-Wavelength Laser Diode for Backward Compatibility of Three Generations’ Optical Disc Systems”
The GG45 (where GG stands for GigaGate, and 45 is to remind the backward compatibility with the 8P8C modular connector - often colloquially called RJ45) is a connector for high-speed Category 7 cable (generally known as Cat 7) LAN cabling developed by Nexans.
If backward compatibility with Microsoft LAN Manager is not needed, in versions of Windows NT (including Windows 2000, Windows XP and later), a passphrase can be used as a substitute for a Windows password.
This was made possible as the SuperDrive now utilitized the same MFM (Modified Frequency Modulation) encoding scheme used by the IBM PC, yet still retained backward compatibility with Apple's variable-speed zoned CAV scheme and Group Code Recording encoding format, so it could continue to read Macintosh MFS, HFS and Apple II ProDOS formats on 400/800 KB disks.