11/04 latest

[Mattis Lind]

2016-06-05 9:58 GMT+02:00 Rod Smallwood <rodsmallwood52 at btinternet.com>:

> Hi
>
>     Well lots fun with the 11/94 project. In fact its become an 11/84 and
> 11/94 project.
>
> After following Sherlock Holmes advice "when you have eliminated
> everything else.Whats left however unlikely is the answer"   I discovered
> the RX211 needed to be in CDEF and not ABCD.  Why did I not know that?
> Well I can only put it down to the fact all of the UNIBUS options I ever
> worked with were hex modules.
>
> Next fascinating fact. You can switch between being an 11/84 and an
> 11/94.  Although one box has three Qbus slots and the other (11/84) has
> four.  If you put an 11/84 CPU  in slot 1 and a MSV11-J (PMI) in 2 or 3 it
> does its startup tests and goes into the monitor screen.
>
> If you try to boot the RX02 in 11/84 mode you get
>
> (the drive does get accessed - there's a nice healthy clonk)
>
> Trying DY0
>
> Error 101
>
> Unexpected trap to location 114
>
> See troubleshooting   documentation
>
> Updated PC 173260          PCR Page = 62       Program listing address =
> 062260
>
> R0 = 000000            R1 = 177170         R2 = 042131 R3 = 000000
>
> R4 = 024000            R5 = 000000          R6 = 172276 R7 = 001600
>
>
> In 11/94  mode it stops at the same point but does not give the error
> message.
>
>
> Comments gentlemen please


OK.

Is this RX211 + RX02 a known working set? It could be useful to wire up a
DL11 (of some sort) at 176500 and connect it to a TU58 emulator to run some
kind of XXDP diagnostics for RX02 / RX211.

Maybe also run other XXDP CPU diagnostics even though the boot ROM probably
include quite some diagnostics for the CPU and memory.

/Mattis


>
> Rod Smallwood
>
>
>