Nic Birsan wrote:
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Why to estimate, let the linker to put the stack last. (Keil will put ?STACK segment for other tools take a look in the /LIB folder - you'll see a startup.a51 file)

I doubt that using Keil's techniques is appropriate in the Metalink Assembler environment that Jeff is using (unless Jeff has switched to Keil's tools). However defining a stack start location after the last used data location and setting SP with that address will accomplish the same thing.