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P87C51MX on-chip RAM usage.

Hello 8051 users,

The new Philips 51MX (51MC2) has 3K of on-chip RAM, and it's divided into "data", "idata", "edata" and "xdata".

Does anyone know how variables should be declared so that all types of variables can be placed in their designated areas and all 3K RAM can be fully used?

Can the data type be controlled for local variables (instead of using default type) ?

Thanks in advance for your reply.
Larry