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

Wait a second,

Bean is right, suggesting an ORG $0A instead of an ORG 8 because addresses 8 and 9 are reserved for the two addional I/O ports (RD, RE) on the SX52. But this also means that you only have 6 bytes of free memory in the global RAM space, instead of the 8 bytes, your program defines.

If you don't need ports RD and RE, simply configure both ports with all bits set for output. You may then use locations 8 and 9 as "regular" registers. I did this recently for testing a program designed for an SX20 on an SX52 Proto Board, and it worked as expected.

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