RQDX3 as third controller under RT-11

Please remember that simply copying the device handler DU to another one (DA or VI, depending who suggested it) and setting the CSR and VECTOR are not sufficient when running under XM. The MSCP device driver creates an extended-memory region which is called 'DU $ ' (the spaces are significant). Only one driver can use said region. Another driver will have to use another region. So, in order to make this work completely under XM, I've usually copied the DUX.SYS handler to another one (DAX.SYS), done the appropriate SET DA CSR=nnn VECTOR=mmm commands, then used SIPP to go in and look for all occurrances of the Rad50/DU/ and changed them to Rad50/DA/. Megan Gentry Former RT-11 Developer +--------------------------------+-------------------------------------+ | Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry!zk3.dec.com | | Unix Support Engineering Group | (home): mbg!world.std.com | | Compaq Computer Corporation | addresses need '@' in place of '!' | | 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ | | Nashua, NH 03062 | "pdp-11 programmer - some assembler | | (603) 884 1055 | required." - mbg | +--------------------------------+-------------------------------------+