Whats a reasonable collection?

From: Brian Chase <bdc_at_world.std.com>
Date: Thu Jun 28 14:56:29 2001

On Thu, 28 Jun 2001, Jeff Hellige wrote:
> on 6/28/01 1:12 PM, Brian Chase at bdc_at_world.std.com wrote:

> > There's EISA. I thought it was an okay bus while maintaining backwards
> > compatibility with ISA. It'd have been more successful if it were
> > cheaper. As for other non-jumpered busses, Sun's Sbus is nice.
> Didn't EISA also suffer from still being slow? I seem to remember that
> it didn't gain much/any speed over ISA, just that the data path went from 16
> to 32bits, allowing it to move more data at the same bus speed? To remain
> compatible with ISA, it would seem they'd have to retain the original bus
> speed as well.

Well, based on this freely available PDF version of the MindShare EISA
System Architecture book. EISA has these improvements over ISA:

  * Supports intelligent bus master expansion cards.
  * Improved bus aribitration and transfer rates.
  * Facilitates 8, 16, or 32-bit data transfers by the main CPU, DMA,
    and bus master devices.
  * An efficient synchronous data transfer mechanism, permitting single
    transfers as well as high speed burst transfers.
  * Allows 32-bit memory addressing for the main CPU, DMA devices, and bus
    master cards.
  * Shareable and/or ISA-compatible handling of interrupt requests.
  * Automatic steering of data during bus cycles between EISA and ISA
    masters and slaves.
  * 33MB/s data transfer rate for bus masters and DMA devices.
  * Automatic configuration of the system board and EISA expansion cards.

The book can be found at:


Received on Thu Jun 28 2001 - 14:56:29 BST

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