In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Herzog wrote:

I was looking at multitasking with the SX/B and basically it seems that  the multitasker is merely an ISR that divides the currently called ISR amongst a schedule [usually about sixteen].  

If you want something called more frequently, you give it more slots.  Since this specialized ISR jumps to the code, it would seem to me that the code could be in SX/B or assembler.  It just cannot be too long and overrun the ISR - 50% or less of the interrupt interval would allow the main program time to get something done.

While I haven't tried it, I suspect it is quite possible.  I refer to an old Ubicom document for a code prototype in SASM. See Dual UART Virtual Peripheral Implementation-AN39 [Nov 2000]

Frankly, it seems so simple in SASM that I might be harder in pure SX/B.

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