On 12/6/05, Adrian Graham <witchy at binarydinosaurs.co.uk> wrote:
On 5/12/05 19:56, "Roger Merchberger"
<zmerch at 30below.com> wrote:
> It looks like there's 1 slot on the 4000T motherboard that might be an ISA
> slot - is it?
Yes, but as many others have observed, it has power only, no signals.
It's like the ISA slots in an A2000 or A3000, but really only designed
for a single-slot bridge card.
> If so, will a plain-jane NE2000 compatible
network card work
> on the thing? (I would think there's drivers for something like that... but
> who knows at this point.)
Not without some way to attach it to Zorro space.
It IS an ISA slot but you also need a Zorro
bridgeboard to activate the
pins...
Right, like a Commodore A2286 card.
I've never seen an ISA bridgeboard :)
What, like the GG2 Bus+ (GoldenGate II Bridgecard)?
http://www.penguincentral.com/GG2/
I have to admit they haven't been popular in a few years, but I still
have new ones on the shelf.
The largest drawback these days is that because of how cacheing was
implemented between the Zorro bus and most '060 cards, they don't play
nice in fully-loaded machines. The GG2 Bus+ lives in Zorro II memory
space (the 8MB chunk) to be able to map ISA memory space over to the
68K in the Amiga. Because C= intended for memory to live there, it's
cached by default on machines like the A3000 and A4000. While there
are workarounds with C= processors (Enforcer disables cacheing in
Zorro II space because C= expect you to be using 32-bit RAM), by the
time the '060s started coming out, things got more difficult due to
the design of the '060 cards. It's possible to write an app to do the
same, but I don't think anyone ever did.
So personally, I only recommend the GG2 Bus+ to stock A2000, A3000,
and A4000 owners. I can't recommend it to anyone who has or who wants
an '060-based machine. Back in the day, those people could afford an
A2065 or Ariadne anyway, so they weren't my prime customers.
-ethan