30 Nov
2015
30 Nov
'15
2:42 p.m.
On Mon, Nov 30, 2015 at 1:45 PM, Fred Cisin <cisin at xenosoft.com> wrote:
Oversimplified remedial tutorial:
From: "Paul Koning" <paulkoning at comcast.net>
Probably outside the domain of the question:
The DPS8-M had configurable core memory bank interleave (even/odd
addresses); I would hazard a guess that this improved bandwidth on double
word read/writes.
-- Charles
Ideally,
the system reads a sector, does what it has to do with the
content, and goes back for the next one, and can read every sector of the
track in a single revolution.
Your writeup was aimed at floppy disks, but
interleave may also appear on
hard drives. I don't remember it in reasonably modern systems, but it
shows up on CDC 6000 systems.
On Mon, 30 Nov 2015, Mike Stein wrote:
----- Reply ----- Definitely an issue with IBM
PC/XTs and clones; I
recall testing every new combination of HD and controller for most
efficient interleave before I delivered to the client.
1) Are there any examples newer than PC/XT 5160?
Although, obviously, completely hidden from the user, is it still used on
anything "modern"?
(Should ALL verbs be changed to past tense?)
2) Is it used on anything besides spinning rust?