I wrote one of these a long time ago for Tru64, but I do not think I still have it. The concept is easy: http://simh.trailing-edge.com/docs/simh_magtape.pdf
But the problem is it becomes extremely driver specific. You need to know what marks the driver is going to write for you - which is highly OS dependent - as well as what the devices does behind the scenes which is highly device dependent. I was going to 9-track and I know the details for all of that, but I have not idea how TKxx wrotes tape marks (I always avoided them as a "bad idea"). In 9-track world, the end of each file is mark as a single meta record (tape mark), Two in the row marks end-of-tape. So the when you write a take the driver check to see if its at start of tape and if not, has to backs up over the last tape mark and then start writing. On close it writes 2 tape marks. QIC tapes do not work that way. Exabyte and DAT are closer to 9-track in rules, but I've forgotten most of the details and I do remember there was something funky about the original DECtape but those bits in my brain have long rotted away. You really should open the driver for the TK50 and see if you can grok it. Look at the open and close code very carefully. Clem On Thu, May 15, 2014 at 4:38 PM, Cory Smelosky <[email protected]> wrote: > Hello all, > > Googling around only seems to want to show me how to copy real tapes to > images. I need to copy a SIMH tape image to a real tape! > > I seem to recall SIMH including a utility for this...but I could be > mistaken. > > I will need a utility that will run on VMS (VAX) as I need to use a TK50 > to make a TK50. (Unless someone wants to doante a TK70. ;) ) > > -- > Cory Smelosky > http://gewt.net Personal stuff > http://gimme-sympathy.org Projects > _______________________________________________ > Simh mailing list > [email protected] > http://mailman.trailing-edge.com/mailman/listinfo/simh >
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