flash (or ide) storage for unibus 11?

[Mike Ross]

On Tue, Nov 24, 2015 at 1:11 PM, Rich Alderson
<RichA at livingcomputermuseum.org> wrote:
> From: David Bridgham
> Sent: Monday, November 23, 2015 11:30 AM
>
>>> For a classic/straightforward programming interface, the Massbus disks (RP04
>>> and successors) are a good choice.  That will take you just over 500 MB, if
>>> you emulate the layout of the RP07.
>
>> Current thinking (at least my current thinking) is RK11 first then probably
>> RP11, both optionally extended to support Q22 addresses.
>
> Why bother with the RP11?  The RP03 gives you a maximum of 40MB (20MW) per disk.

Because, blinkenlights! :-)

There was an RP11, an RP15, and an... RP10? Lots of blinkelights,
covers 3 of the 4 main architectures.

There IS something neat about retaining enough of the physical side of
things to be recognizable in emulation... having a controller box with
blinkenlights, and ports into which you plug your RP03s... even if the
RP03s are memory sticks and the physical interface is USB...

>> Finally, most likely the RH11 for some Massbus disks with 22-bit addressing.
>
> Be careful with the RH11 (and other Massbus interfaces):  DEC lied in their
> published descriptions of the signals.  In particular, 2 important ones are
> interchanged in the tables.

I seem to remember Massbus wars, and DEC having a strategy to use IP
to lock out plug-compatible competition... was unpublished or
inaccurate information part of that, I wonder?

Mike

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