🚀 go-pugleaf

 >>> I recently added a DEQNA (M7504) module, etch b, rev a to an LSI 11/2
 >>> system.  I'm trying to run Xinu V7.  The DEQNA is exhibiting some strange
 >>> behavior.  When I run Xinu, the program terminates with an illegal
 >>> instruction panic at the first access to the DEQNA I/O registers.  I
 >>> checked the machine code at the point the panic was generated, and it
 >>> seems to be a perfectly valid MOV instruction, with one of the I/O
 >>> registers as an operand.  If I try to access the I/O registers
 >>> through the LSI 11/2 microcode ODT, the processor goes into
 >>> an unknown state in which it incorrectly echoes or ignores keyboard
 >>> input, and I have to reboot the system.
 >>> 
 >>> Anyone seen these symptoms before?  Any advice or ideas would be
 >>> greatly appreciated.
 >>> 
 >>> - Ralph Droms
 >>>   Bucknell University
 >>>   droms@bknlvms.bitnet

We haven't ever seen that problem here.

Doug