[comp.sys.amiga.tech] SCSI vs. ST506, and DMA

robert@hubcap.UUCP (Robert Reynolds) (07/22/88)

There seem to be two kinds of hard disk controller for the Amiga:  SCSI
and ST506.  I've been told that SCSI has a much greater transfer rate
than does 506, but that I'm unlikely to see much benefit from that
unless I have a controller with DMA.  Apparently there aren't any 1000
controllers with DMA?  But there are a number of companies working on
expansion boxes for the 1000 that will accept A2000 cards.

I'd like any information you care to provide on this whole situation,
but particularly:

	Are there really no SCSI controllers with DMA for the 1000?
	Why not?

	Will 2000-compatible cards plugged into the new expansion boxes
	be "crippled" somehow because they're not really directly on a
	2000 bus?  (And if not, I really don't understand why somebody
	hasn't done one directly for the 1000.)

Thanks for any info or discussion you can provide.


-- 
Robert Reynolds                 uucp: ... !gatech!hubcap!robert
CS Dept, Clemson Univ.    	ARPA: ROBERT@TECNET-CLEMSON.ARPA
phone: (803) 656-5884           inet: robert@hubcap.clemson.edu

ain@s.cc.purdue.edu (Patrick White) (07/26/88)

In article <2268@hubcap.UUCP> robert@hubcap.UUCP (Robert Reynolds) writes:
>	Will 2000-compatible cards plugged into the new expansion boxes
>	be "crippled" somehow because they're not really directly on a
>	2000 bus?  (And if not, I really don't understand why somebody
>	hasn't done one directly for the 1000.)

   There was one box I saw at AmiEXPO, and I asked to be put on ASDG's
mailing list for their 2000+1 box..
   The one I saw was called the "Bus Expander".. it was in a PC-clone case
with a PC-clone power supply, didn't have the CPU slot the 2000 has, and I
don't remember seeing a monitor slot either (no mention in the add of course)..
They do claim the 2088 bridgecard works though.
   I asked about ASDG's box, and found out that it will be out RSN.. whatever
that means :-)  so I didn't bother to ask about info but got on their mailing
list.

   I believe ASDG's box will have CPU slot, etc.. but I won't know till I get
the literature on it.

   There are probably more, but that's all I saw.


-- Pat White
ARPA/UUCP: j.cc.purdue.edu!ain  BITNET: PATWHITE@PURCCVM  PHONE: (317) 743-8421
U.S.  Mail:  320 Brown St. apt. 406,    West Lafayette, IN 47906