Symbian OS 9.0 was used for internal Symbian purposes only. It was de-productised in 2004. 9.0 marked the end of the road for EKA1. 8.1a is the final EKA1 version of Symbian OS.
Symbian OS has generally maintained reasonable binary code compatibility. In theory the OS was BC from ER1-ER5, then from 6.0 to 8.1b. Substantial changes were needed for 9.0, related to tools and security, but this should be a one-off event. The move from requiring ARMv4 to requiring ARMv5 did not break backwards compatibility.
A Symbian developer proclaims that porting from Symbian 8.x to Symbian 9.x is a more daunting process than Symbian says.[8]
EPOC is a family of graphical operating systems developed by Psion for portable devices, primarily PDAs. EPOC came from epoch, the beginning of an era, but was backfitted by the engineers to "Electronic Piece Of Cheese"
We need Active Objects to perform multi-tasking in a single thread. It is also needed when you deal with client-server architecture inside Symbian. RunL() needs to be kept short as it is an non-preemptive multi-tasking process, it would hang the system otherwise.
According to the two phase constructor idiom all initialisation code that might leave , as well as any call to the fuction that might leave are put together into a constructor call ie; ConstructL() known as the two phase constructor. This is used for proper cleanup if any leave occurs.
Multiple Active Objects in 1 thread and No data synchronisation and context switching overheads
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