General TC11 DECtape diagnostic/formatter questions
jnc at mercury.lcs.mit.edu
Tue Nov 8 15:43:03 CST 2016
> From: Josh Dersch
> If I run them on SIMH configured as an 11/44, I see the same behavior.
> If I run them on SIMH configured as an 11/20, then I get the printout
> described in the documentation and listings. ... I haven't yet dug in
> to see what accounts for the difference -- any ideas?
The fact that the simulator produces identical results to the real hardware
would argue that it's not a bug in that particular hardware. So it must be
some real difference between the two.
There are subtle differences between the 11/20, and other 11's - e.g. on the
/20 SWAB does't clear the V bit - maybe it's one of them? It might be worth
trying setting the CPU type to other values, and see if it works on any other
> 2) I'm looking for means to format DECtapes on the TC11. ... The
> maintenance manual only indicates "a special program supplied with the
> TC11 system," and I haven't managed to find it.
The UNIX V6 distro includes a standalone program, tcf.s, to format DECtapes.
I don't know if you have a running V6 system (real or emulated) to assemble
it one; if you want me to assemble it and provide it as binary (in a variety
of formats, e.g. .LDA format), let me know.
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