Date   : Mon, 03 Jan 2011 04:01:46 +0100
From   : rick@... (Rick Murray)
Subject: Patching a CF card patched ADFS

On 03/01/2011 02:13, Philip Pemberton wrote:

> Even the two-slice quad-slot was shaky IME.

<glances@...>

Really?

To be honest, I have never really been a fan of flimsy-looking edge 
connector designs, but this never seemed to be an issue for PCI or the 
stupidly high density DIMM modules around these days.


> Getting a ViewFinder, a HCCS Vision, a UniPod and one other I/O card to
> play nice together involved a lot of slot-swapping and meddling with
> software. No IRQs or DMA channels to muck about with, but getting the
> timing issues sorted was "fun".

HCCS Vision, Morley SCSI, Simtec IDE. Just plugged 'em in and it all 
works fine. Both with ARM610 and ARM710 cards (plus a bog-standard 486).

I wonder if some RiscPCs are "different"? I recall in the Argonet days, 
there were some machines that Fresco was just crashy on, oflaoflaofla. 
Thankfully mine wasn't one of them.
I wonder what it was. Didn't some need a component-level tweak for the 
x86 card? Some capacitor or other? Maybe a batch were built using a PAL 
or somesuch with slightly different timing. Nothing that would show up 
until it is pushed...? The sort of thing that would be a nightmare to 
try to diagnose, I mean, you can't exactly single-step it because that 
would totally change the timings. For that, you might as well scratch 
Schr?dinger's moggy between the ears...


> well, I do have a box full of ROM cartridges :)

Well, that's a good start. :-)


Best wishes,

Rick.

-- 
Rick Murray, eeePC901 & ADSL WiFI'd into it, all ETLAs!
BBC B: DNFS, 2 x 5.25" floppies, EPROM prog, Acorn TTX
E01S FileStore, A3000/A5000/RiscPC/various PCs/blahblah...