how make variables overlay C51 7.0

the following string

c:\tools\keil\c51\bin\bl51 MSstart.obj, MSisr.obj, MSxdata.obj, ams.lib, c51s.lib TO ams.omf RS(256) IX >protl.log
produces an object with no overlay of variables, what is wrong. Also, no index is generated.

The string worked with a prior release.

Erik

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