9 track tapes and block sizes

Matt Burke matt at 9track.net
Thu Sep 17 07:26:01 CDT 2020

On 17/09/2020 07:38, Dave Wade G4UGM via cctalk wrote:
> The docs for SIMH .TAP files are here:-
> http://simh.trailing-edge.com/docs/simh_magtape.pdf
> be careful as there are also non-SIMH .tap formats 
> In the IBM Mainframe emulation world there is also .AWS, an IBM format
> introduced with its P390 Microchannel Mainframe card  
> and .HET a Hercules extension to .AWS which allows compression

vtapeutils is quite handy for translating between (or listing) a few of
the emulated tape formats. It supports AWS, TPC (2 byte record headers)
and TAP (Simh - 4 byte record headers).


I've used TPC on RSX-11M and VMSTPC on VAX/VMS to read 9-track tapes.
Then I used vtapeutils to convert from TPC to TAP format for Simh.


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