More Bringing up a CPM

From: Dwight Elvey <elvey_at_hal.com>
Date: Tue Jun 1 15:58:46 1999

CLASSICCMP_at_trailing-edge.com wrote:
> --snip--
> Welcome to the world of S-100, where DRAM boards often didn't
> support DMA controllers properly. In some cases, you can rejumper
> them so that the DMA vs refresh timing conflict isn't such a problem.
> But many of us just went to pure static RAM systems where DMA
> was being done.
>
> What disk controller are you using, BTW? In some cases the problem
> isn't so much the memory, but it's the disk controller.
>

Hi
 It is an old descrete TTL controller by Digital Sytems. It
has a seperate bus interface card labled "HB-1". The controller
in the disk drive box is a "FDC-1". I have schematics for both,
so I may be able to do something. I may just have to continue
with the statics but these boards are quite old and I've
already had to replace one 74LS32 on one of the boards. Maybe
I should write a more intense RAM test and run them through
their paces. I don't think I'd want to wait for GALPAT but
a simple March C seems to be in order.
Dwight
Received on Tue Jun 01 1999 - 15:58:46 BST

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