Unibus on a VAX 6000 (was Re: New VAX 6000 toys.)

--- no <oliv555(a)arrl.net> wrote: If they can take it, you'd need a DWBUA on a VAXBI bus (there is no Unibus adapter for XMI). ISTR when the 6000 was current that DEC imposed a limit on how fast a machine could take a DWBUA, not to screw the customer, but because some of the (then) newer machines had so many layers between the Unibus peripherals and memory that timings could not be maintained. So... AFAIK, a DWBUA will work with some models of 6000, but not necessarily all. What you would need is: the DWBUA BI module itself (T1010?), four 30-pin cables, a Unibus paddle card and a UET (Unibus Exerciser/Terminator) All parts are required. The DWBUA talks to UET registers and won't come on unless they respond. That's where mine is. I can see the BI register (X + 0xF0, IIRC) that holds the test results. It seems to mostly come up with one of my three UETs, but not entirely. I also have a DWBUA I (not quite) repaired - a DC021C chip blew up (literally) on two modules from immediately after I moved the 8200 to my basement. I have robbed Peter to pay Paul and moved a chip from the board with crisped traces to the non-critically damaged board. That one seems to have an internal memory fault with the microcontroller, according to the error code. It does not appear to be attempting to talk to the UET. Perhaps someone here more familiar with the 6000 can speak with some authority about what models a DWBUA might work with. -ethan P.S. - you'll also need a BA-11 with at least one DD11-DK backplane for the actual Unibus itself, but that may be obvious. __________________________________________________ Do you Yahoo!? Faith Hill - Exclusive Performances, Videos & More http://faith.yahoo.com