Il 21/08/2010 02:37, Rich Alderson ha scritto:
after looking at PDP-7 DECSYS (aside that seems that can't works on SIMH
because of the DECTape track mark issue)
Have you tried it? I just did, following Bob's instructions in the doc.txt
file included in decsys.zip on the SimH software page. See below.
Remember that the DECtape images used by SimH are data-only, and assume
standard format tapes (578 blocks of 256 18- or 16-bit words or 128 36-bit
words, or 1100 blocks of 129 12-bit words). The difference between a PDP-7
DECtape and other systems' is in the overhead frames, not in the data.
Yes, I have no issues in booting & running DECsys-7, the real issue is
that the assembler and fortran compiler don't work, and the latter,
IIRC, entering an infinite write loop on the scratch tape (for sure, I
find a multi-megabyte scratch tape after the ^E) I suspect that this was
'cause both program look for the marks in the scratch tape(s)
(as hinted in some of my past post, my main interest in emulation
at-large, well, is homebrewing new code...)
ah, in assembling & comiling I have followed the DEC manual of the
DECsys-7, whose is in the good ol' Kossow's now huge bitsavers archive :)
(As it happens, Prof. Harlan Lefevre was here at the museum last week, to
give us a hand with the PDP-7. Bob's notes, written in 2006, mention that
we would be putting the system on-line "soon"; 4 years isn't that bad.)
well, when the -7 finally boots, I hope will be tried some test
assembling & compiling and a check of the actual state of the track
marks on physical scratch DECTapes after an assembling & compiling...
For now, I'm scratching the head ;)
Best regards from Italy,
dott. Piergiorgio.
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