A DOS Protected-Mode Interface (DPMI) server, such as that provided in a DOS box in Windows enhanced mode/r
Prevents LINK from using extended memory under DOS. The /r option must appear first in the options field on the command line and cannot appear in a response file or the LINK environment variable. LINK.EXE is extender-ready and uses extended memory if it exists. This option forces LINK to use only conventional memory. The option name is case sensitive.
For LINK to run in DOS-extended mode, sufficient extended memory must be available. The memory must be provided by one of the following:
A DOS Protected-Mode Interface (DPMI) server, such as that provided in a DOS box in Windows enhanced mode
A Virtual Control Program Interface (VCPI) server, such as Microsoft's EMM386.EXE
An XMS driver, such as Microsoft's HIMEM.SYS