[Simh] Unibus XOR Tester

[Walter F.J. Mueller]

Hi,

when looking through a few listings of XXDP tests, I saw code
sections mentioning a

	XOR Tester

This was obviously a Unibus device at address 177060. The typ.
code found in many IOT handlers is

                                 ;
                                 ; XOR Tester stub
                                 ;
005646  013746  000004          L000:   mov     @#v..iit,-(sp)
005652  012737  005672  000004          mov     #V004,@#v..iit
005660  005737  177060                  tst     @#177060
005664  012637  000004                  mov     (sp)+,@#v..iit
005670  000463                          br      B102
005672  022626                  V004:   cmp     (sp)+,(sp)+
005674  012637  000004                  mov     (sp)+,@#v..iit
005700  000423                          br      B098

Does anybody know what this test device did, where on bitsavers
or elsewhere it is described ?


			With best regards,	Walter