Tim
Doing a bit more digging, it looks like if I just use the SIMH “RAUSER” disk type, and give it a size large enough for my needs, I’ll be OK. The precompiled SIMH binaries for Windows include 64 bit file support so I can go bigger than 2Gb without any problems. I also came across a archived post from Bob Supnik lamenting the lack of information for the RA70, RA73 and the other disk I mentioned. Kind of bizarre that no-one knows the details. I half expected a former Digital employee or a NOPSIG member might have known the answers or been able to put their hands on a product technical / service manual, or that someone with a still-running system might have been able to provide the answers. Thank goodness for MSCP ! Thanks Jason
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