2016-06-05 9:58 GMT+02:00 Rod Smallwood <rodsmallwoo...@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 > > >
