rodsmallwood52 at btinternet.com
Sun Jun 5 02:58:54 CDT 2016
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)
Unexpected trap to location 114
See troubleshooting documentation
Updated PC 173260 PCR Page = 62 Program listing address =
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
Comments gentlemen please
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