Segment ISTACK is too long for segment definition. You moved a project from IAR Embedded Workbench for 8051 version 8.20 or older, and in version 8.30 you suddenly get linker error e16 for the Internal RAM. When you link a project a linker configuration file is used. It contains commands for the linker. In IAR Embedded Workbench for 8051 it is found via the menu Project Options Linker Config Linker configuration file. There was a change in the V8.30 release so the symbol _NR_OF_VIRTUAL_REGISTERS is no longer used. It is this extra size that cause the linker error. The file in your project probably comes from IAR Embedded Workbench for 8051 version 8.20 or older, and it contains. Make a new copy of the file if needed and change that line to. Exact version details. This change was implemented in version 8.30.1 (as identity EW24413), and documented in the Release Notes for version 8.30.2.
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