I have been working on getting a TC11 with a TU56 running. It is connected to a PDP-11/05.
First it failed on ZTCA diagnostic but it was quite easy to track down a failing N8281 on M795 board which made bit 9 of the Current Address register to be stuck high. Then I tried ZTCBE0. Unfortunately I din't find the matching listing. When trying to run this one it constantly says: "FATAL ERROR TRAP TO LOCATION 4 FROM LOC012660 (?BAD CPU?) ATTEMPTING RO RESTART PROGR" But as far as I can tell the CPU is good. I ran every possible CPU diagnostics without any problem. I also ran five different memory tests - no problems. Anyone has a clue what is wrong? 12660 is a mov (r1)+, (r2)+ so it might be addressing outside memory. The listing states that it needs 8k core and I do have 8k good core in the machine. Then I ran ZTCC through ZTCE which all works fine. I do get occasional error but I think it has to do with the tape which was not newly formatted. Finally I tried to run a DECtape formatter. Again I had problems with listing mismatching the binary. The program halted on me at locations which were not the same as in the listing. I pressed continue and it did. I looked at what it did: The first pass was doing WRTM on the entire tape. Then it halted and I pressed CONT. Now it did WALL, followed by RALL and finally WDATA followed by a HALT. Pressing another CONT just repeated the procedure once more. It looks like the tape was correctly formatted but I am not 100% sure. Does anyone has more info on the DECtape formatter program? Possibly a listing and a binary that matches? /Mattis
