21 Feb
2008
21 Feb
'08
11:20 p.m.
On Feb-21-08 at 16:05:45, Jerome Fine wrote:
If my memory serves me correctly (which is not very
frequent these days), I seem to remember receiving
a BA23 box with an M8189 in the top slot and the
RLV11 in to next 2 slots. The memory for the system
(normal PDP-11 Qbus memory) was in slot 4.
As far as I know, there might be a delay factor
associated with placing the memory below the RLV11,
but it still functions correctly.
It's entirely possible that it would work correctly.
Covention has always been that PMI memory immediately precedes
the CPU, and NON-PMI memory immediately follows the CPU.
I've always just assumed that there was a reason for it,
and never really questioned it, since I had no need to.
I'm surprised anyone would bother with an RLV11 in a BA23,
since the RLV12 was readily available at the time, and supports 22-bit.
Much less space, power, and heat.
Although sometimes you just have to work with what is at-hand. ;-)
T
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22 Feb
22 Feb
8:03 a.m.
New subject: [SPAM] - RLV12 placement in H9278-A question - Sending mail server found on dnsbl.sorbs.net
tiggerlasv at aim.com wrote:
On Feb-21-08 at
16:05:45, Jerome Fine wrote:
If my memory serves me correctly (which is not
very
frequent these days), I seem to remember receiving
a BA23 box with an M8189 in the top slot and the
RLV11 in to next 2 slots. The memory for the system
(normal PDP-11 Qbus memory) was in slot 4.
It's entirely possible that it would work correctly.
Covention has always been that PMI memory immediately precedes
the CPU, and NON-PMI memory immediately follows the CPU. I've always just assumed that there was a reason
for it,
and never really questioned it, since I had no need to.
Necessity is often a reason to try and see if it works.
I'm surprised anyone would bother with an RLV11 in
a BA23,
since the RLV12 was readily available at the time, and supports 22-bit.
Much less space, power, and heat.
And this particular fellow was a tech support, so I am sure that he did
have an RLV12 around - but for some reason used the RLV11.
Although sometimes you just have to work with what is
at-hand. ;-)
YES!!
Sincerely yours,
Jerome Fine
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jhfinedp3k＠compsys.to -
tiggerlasv＠aim.com