[rescue] Vesa Local Bus video cards

[Michael Free]

It wasn't the same pin count... what there was, was a second set of leaves
deeper in the slot that made contact with another set of contacts on an EISA
board, doubling the pin count (roughly). The advantage was, the ISA overlay
remained intact, and since the ISA card's connector wasn't milled deep
enough to reach the second set of contacts, you could set an ISA card in an
EISA slot, no problems.

So, the factor is the same, but the pin count doubled by a dirty trick.
Pretty neat :)

Mike Free
----- Original Message -----
From: "Joshua D. Boyd" <jdboyd at celestrion.celestrion.net>
To: "The Rescue List" <rescue at sunhelp.org>
Sent: Monday, March 31, 2003 10:36 PM
Subject: Re: [rescue] Vesa Local Bus video cards


> On Mon, Mar 31, 2003 at 06:54:27PM -0500, Phil Stracchino wrote:
>
> > the PC-based server market went with EISA, which pretty much nailed the
> > coffin lid down on local bus.  OK, so it might be a slightly slower bus,
> > but you could have as many 32-bit slots as you could afford.
>
> I've heard that EISA was 32bit, but how did they do that while using the
> same pin count as ISA16?  Or am I wrong in remebering that the two were
> the same form factor?
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