Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!cs.utexas.edu!uunet!world!ksr!kenyee@ksr.com
From: kenyee@ksr.com (Ken Yee)
Newsgroups: comp.periphs.scsi
Subject: favorite SCSI controller chips
Message-ID: <1641@ksr.com>
Date: 29 Dec 90 02:36:50 GMT
Sender: news@ksr.com
Distribution: usa
Organization: Kendall Square Research Corp.
Lines: 16

As a curiosity question, what do people think is the fastest (designable
throughput as opposed to spec claims) SCSI chip out?  Which company will
have the fastest in the next 6 months?

My opinion:
    Adaptec 6250
	- 3 Mbytes/sec Async
	- 5 Mbytes/sec Sync (using only an offset of 8...NCR's 53C90 needs
	  an offset of 16 for this speed).
	- 10 (8 bit bus) or 20 (16 bit bus) buffer DMA transfer.
	- Arbitration and Selection into command phase done in hardware.
    Next 6 months:  Adaptec with SCSI-2 chips (SCSI compatible connectors).

I'll do a post to the net if there is sufficient interest.

   Ken    (kenyee@ksr.com  or  uunet!ksr.com!kenyee)