23 Nov
2015
23 Nov
'15
4:11 p.m.
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.
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.
Rich
Rich Alderson
Vintage Computing Sr. Systems Engineer
Living Computer Museum
2245 1st Avenue S
Seattle, WA 98134
mailto:RichA at LivingComputerMuseum.org
http://www.LivingComputerMuseum.org/