Information about Rational System's 286 extender seems to be limited. What I found: Rational System were later renamed to Tenberry and their DOS/4G and DOS/4GW

Information about Rational System's 286 extender seems to be limited. What I found: Rational System were later renamed to Tenberry and their DOS/4G and DOS/4GW extenders were very popular (due to the latter being bundled with Waycom C). But they were for the 386. The version that worked on the 286 was called DOS/16M, because it supported 16MB of address space. Someone summarises the API here [1]. I was kind of hoping someone might have uploaded the manual to archive.org, but no luck. [1] https://groups.google.com/g/comp.sys.ibm.pc/c/zkgdj84bRkE/m/iYCdsWhhOkYJ?pli=1 https://groups.google.com/g/comp.sys.ibm.pc/c/zkgdj84bRkE/m/... Apparently it was called DOS/16M and the company was later renamed to