General TC11 DECtape diagnostic/formatter questions

Paul Koning paulkoning at
Wed Nov 9 08:52:44 CST 2016

> On Nov 9, 2016, at 3:59 AM, Christian Corti <cc at> wrote:
> On Tue, 8 Nov 2016, Josh Dersch wrote:
>> with the TC11 system," and I haven't managed to find it. I *have* found
>> this:
> ... which is simply a mirror of our FTP server at
> I enhanced DTF with some useful messages and error/status output. IIRC the "original" version produced no messages at all.

That sounds right.  The convention of the paper tape era diagnostics is that errors are reported by halts at specific (documented) addresses, sometimes with specific values in R0.


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