Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!usc!henry.jpl.nasa.gov!elroy.jpl.nasa.gov!ucla-cs!maui!michael
From: michael@maui.cs.ucla.edu (michael gersten)
Newsgroups: comp.sys.amiga
Subject: Re: GVP controller
Keywords: DMA is better.
Message-ID: <26545@shemp.CS.UCLA.EDU>
Date: 19 Aug 89 00:01:39 GMT
References: <8908072207.AA14796@jade.berkeley.edu> <12254@grebyn.com> <501@tardis.Tymnet.COM> <1701@cs-spool.calgary.UUCP>
Sender: news@CS.UCLA.EDU
Reply-To: michael@cs.ucla.edu (michael gersten)
Organization: UCLA Computer Science Department
Lines: 17

In article <1701@cs-spool.calgary.UUCP> deraadt@enme3.UUCP (Theo Deraadt) writes:
>
>With a SCSI drive, any of the newer than 2 year ones anyways, the drive
>spin time is NOT a factor. You issue a command to the SCSI drive, and then
>disconnect from the device. The device has a cache on it. It gets the first
>bunch of stuff. Then it reconnects to the controller. 

This is a good point. What controllers for the amiga support both
bus arbitration (multiple computers/initiators on the same cable)
and bus selection/disconnect/reconnect?

I.e., I want to be able to have a read going on one drive while another
drive is busy writting (both on my amiga), while a third drive is
in the middle of a command for the other computer. Later, the programs
can exchange data over SCSI--or am I hopelessly dreaming?

		Michael