RL02 version of UNIX6?

Bill, My first PDP-11 system was a PDP-11/24 (256KB) with 2 RL02s. It ran RSX11M V4.0 and collected RS232 data from lab instruments and provided a programming environment and handled 3 or 4 users ok. Later we added a KT24 and went to 512KB. With 2 RL02s one was a system disk and one was a user/data disk. The utility BRU allowed you to make a copy of the system disk, but to backup the data disk, one has to boot BRUSYS.SYS which is a memory resident only RSX11S system that RSX11M includes so you can remove the system disk and make a disk to disk copy of the non-bootable user disk. Actually, BRUSYS.SYS is small and you can have the user disk boot block point to it for convenience. RSX11M especially in small memory systems should be customized to your hardware. If you have extra DL or DZ terminal ports or other hardware you will need to do this. You can use the RL02 disk emulation, but have 4 of them for convenience so you don't to swap disk images during the process. Once you have SYSGENed an RSX11M system you are happy with then the RL02 disk image file needs to be transferred to an RL02 pack. This is the tricky part. RSX11M+ can run a TCP/IP stack and the disk image could be FTPed to it from the Linux or Windows system running Simh. M+ could mount the disk image file and BRU the image to a physical disk (if the M+ system had an RL02 Drive). I don't have RL02s and don't know anyone who does. Also, you might find a Baseline RSX11M disk someone has which can be copied and booted. Since we are unlikely to find a SYSTEM to do that then, the other way would be with PDPGUI from Jorge Hoppe. His PDPGUI program can load via ODT a small driver to write to an RL02 and then transfer a disk image over the console port. It would take quite a while but it can be done. http://retrocmp.com/pdp-11/pdp11gui/disk-images-readwrite This assumes you have ODT and I don't know if an 11/40 does. The !1/05 doesn't either but Jorge found that a M9312 bootstrap card with ODT ROMs will enable ODT on an 11/05 so it should work on an 11/40? http://retrocmp.com/how-tos/interfacing-to-a-pdp-1105/194-interfacing-with-… RT11 would work very well on two RL02s as well. In fact, one can get by with two RX02s. It is a much simpler operating system. RT-11 and RSX11M are quite different internally. RT-11 is a single user monitor that was extended to multiuser with some later version and via the TSX operating system. TSX is more like your Windows analogy. The RSX11M executive was written from the ground up with conditional assembly code that can be customized for your hardware so any code for hardware not needed can be left out. When you do a SYSGEN you actually compile the assembly source for much of the operating system and then link (TasK Build, TKB) it. Utilities come in object libraries and can be modified a bit when linking. Also, many of the features of the OS can be left out if you don't need them. It was designed to have executive calls that were compatible with RSX11M and IAS which ran only on large systems. Much of the same languages can be run on RSX and RT11 (Fortran, Basic, Macro, APL) and RSX can read RT-11 tapes and disks with the utility FLX. Good Luck, Mark