<html><head></head><body>Paul. The RM06 has its own massbus id. The device can also emulate existing dec disks, which means no changes needed. But when identified as an RM06 it becomes a bit more interesting as this device does not have a fixed size. Similar to mscp in that way. It has fixed numbers for sectors/track and tracks/cylinder but the number of cylinders depends on the actual disk. So the os must figure disk size out at runtime.<br>
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I know rsx does it, as I have the sources. I would expect that Mentec also added this for RSTS/E but I have not actually checked that.<br>
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Johnny <br>
<br><br><div class="gmail_quote">Paul Koning <paulkoning@comcast.net> skrev: (11 december 2017 15:38:26 CET)<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<pre class="k9mail"><br /><br /><blockquote class="gmail_quote" style="margin: 0pt 0pt 1ex 0.8ex; border-left: 1px solid #729fcf; padding-left: 1ex;"> On Dec 10, 2017, at 5:12 AM, Johnny Billquist <bqt@softjar.se> wrote:<br /> <br /> Rich. This is a nice thing. Thanks.<br /> <br /> I have one question/wish, though.<br /> I don't know if you were aware of a device called the RM06. This was a Massbus disk created by Shelby, which was varible size.<br /> It would be a really nice thing to emulate. I can probably reverse engineer it from the RSX driver, and I don't know which systems ever supported it. RSX for sure. Possibly also RSTS/E, but beyond that is more uncertain. Most people and systems had moved on from Massbus before this drive came out.<br /></blockquote><br />RSTS should be able to handle a third party Massbus disk if it identifies itself by the ID code of a DEC disk and has the same geometry. (More precisely: if it has more cylinders than the original, that would be ok, those would be ignored. But track and sector counts must be exact.)<br /><br />With the source kit, you could add a new disk model, it isn't all that hard though it is completely undocumented. I suppose it might be possible to *replace* an existing entry. Haven't looked at that. Studying the sources should tell us.<br /><br /> paul<br /><br /><br /></pre></blockquote></div><br>
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