23 Nov
2015
23 Nov
'15
4:23 p.m.
On Tue, Nov 24, 2015 at 1:11 PM, Rich Alderson
<RichA at livingcomputermuseum.org> wrote:
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 was unpublished or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
http://www.corestore.org
'No greater love hath a man than he lay down his life for his brother.
Not for millions, not for glory, not for fame.
For one person, in the dark, where no one will ever know or see.'
From: David Bridgham
Sent: Monday, November 23, 2015 11:30 AM
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...
> 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. 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.