Configuring an MS11-L for an 11/24
cz at alembic.crystel.com
Sat Oct 17 22:12:27 CDT 2020
And one mistake already: Pulling the 11/24 box out shows the H777 supply
in it does supply +15v, so the memory board jumper is configured back to
Also I see slots 3-6 only need G727 knuckebusters as DMA is jumpered by
default, as is slot 9. With the Rl11 controller in slot 7 and the RX02
controller in slot 8 I should be good. Still will need to find a 9302
terminator somewhere. I wonder if a 930 knucklebuster terminator will work.
On 10/17/2020 10:26 PM, Chris Zach via cctalk wrote:
> So I'm working on this old MS11-L board I have had sitting around
> forever. M7891 DK. Goal is to use it in my 11/24 with KT24 MMU.
> I've switched the jumpers so it will run on a +12 supply instead of a
> +15, and so it will run in an extended Unibus slot as opposed to a
> normal unibus.
> However I'm stumped regarding the +5v and +5 BBU supply lines. The
> problem is the manual says to set the jumper that is above C12 (bottom
> of board, two capacitors next to each other, pretty easy to spot) so
> that W3 is in and W7 is out if you just have +5v. On this board, W3 is
> out, W7 is in, but there are two other jumpers right above them (nothing
> is labelled on the board).
> Is it the bottom jumper that is +5 or the bottom and the one above that
> need to be moved?
> This might be why this board never worked right, if the memory refresh
> is expecting power on the BBU line and I don't have that then it's not
> going to work very much :-) But which jumper is the right one to use?
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