memory map for RT-11 v 5

You need to be more specific! Starting with V05.00 of RT-11 in 1983, there were a total of 17 versions released up to V05.07 in 1998, including sub-versions V05.01B, V05.01C, and V05.04A to V05.04G of RT-11. Up until V05.05 of RT-11, RT11SJ.SYS required the least memory which was replaced with RT11SB.SYS for V05.06 and V05.07 of RT-11. Attempts to boot from RT11SJ.SYS under V05.00 of RT-11 with 24K bytes of memory were successful. Attempts to boot with 16K bytes of memory were unsuccessful. An RK05 was used as the disk drive since it is close to the smallest device driver. The answer to your question about using 16K bytes of memory is NO for all versions of RT-11 starting with V05.00 or RT-11. Attempts to boot from RT11SJ.SYS under V04.00 of RT-11 with 24K bytes of memory were successful. Attempts to boot with 16K bytes of memory were also successful. An RK05 was used as the disk drive. The error message "Insufficient memory" is displayed, but some useful work might be done with just 16K bytes of memory. However, you did not ask if useful work being done was one of the criteria? NOTE that I used the Ersatz-11 emulator to check the above details, so there might be a difference with actual hardware. If you have any more questions, please ask. Jerome Fine