LSI-11 Processor Status Word

Jerome Fine replies: YES!! As Megan Gentry said, all CPUs based on the J11 chip have a PSW at 177776 within a program and via hardware ODT at: 777776 on an 18 bit address bus 17777776 on a 22 bit address bus However, even an LSI-11/02 has a PSW, but you have to use an instruction (MFPS) to access it and (MTPS) to write to it. I believe that all Unibus system have a PSW. There was some mention that the hardware for TCP/IP uses the date as part of the message (part of ethernet??). Is that true?? And how does that interact with RT-11 or TSX-PLUS? Also, do you mean V5.4 "blank" of RT-11 which was released in 1986 or a later version such as V5.4G which was released in December 1988? If you mean TSX-PLUS, then NO!! Unless of course you also want to us use the same (hardware - not always) features under RT-11. About the only device driver which you must have in both RT-11 and TSX-PLUS is the system boot device since, as far as I know, TSX-PLUS can be booted only as a system device since the command to boot must be "R TSX", although it is likely that "RUN SY:TSX.SAV" would also be correct. Note that under V5.4 of RT-11 which are distributed from DEC, if you are on a DU.SYS device driver (you may boot from RT11FB although RT11SJ is usually recommended), DEC did not allow you to boot RT-11 from a non-zero partition. There is a patch to the DU.SYS file which will allow a software boot from a non-zero partition and thereafter from a non-zero partition for TSX-PLUS. I won't ask if you want either the RT-11 or the TSX-PLUS to be Y2K compliant. Sincerely yours, Jerome Fine RT-11/TSX-PLUS User/Addict