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Instead, he has taken Tim's patch, and modified the pdp11_dl.c code so that the address and the carrier detect can be set at runtime to behave like a DC11. Here are the simh.cfg lines you need to add once you apply the KL.diff patch to Simh: set ttix en ; Enable DC/DL-11 device set ttix lines=8 ; We want 8 serial ports set ttix address=17774000 ; Set the address to be a DC-11 set ttix carrier=dc ; Turn on the DC-11 carrier detect bit set ttox 7b ; Set output to be 7-bit, lowercase att ttix 5555 ; Attach serial ports to telnet 5555