8 Feb
2015
8 Feb
'15
8:40 p.m.
What I was trying to say is that it's not part of the 128 kw or 256 kb
limit of the 45 and is fast.
I don't recall being able to have 2 sets of it. I don't think I've seen one
since I left DEC in the late 70s, but thanks for clearing that up.
Paul
On Sun, Feb 8, 2015 at 4:44 PM, Eric Smith <spacewar at gmail.com> wrote:
On Sun, Feb 8, 2015 at 2:16 AM, Paul Anderson
<useddec at gmail.com> wrote:
Think of the bipolar as very fast extra memory.
It can sort of act like a
cache memory, and can help with processor throughput.
Only if software is carefully written to use it that way. The hardware
doesn't use it in any way similar to a cache. It's just a memory
region that happens to be fast.
I thought there were
2 controller boards and 4 G401s, but one is better than none. You can
check
that on the top of the processor box in the
module chart.
Depends on how much Fastbus memory you have. There's a controller in
slot 16 for memory modules in 17-20, and optionally a second
controller in slot 21 for modules in 22-25. There's no interleaving,
so you only need the second controller when you have five or more
memory modules.