kenyee@ksr.com (Ken Yee) (12/29/90)
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)
neese@adaptx1.UUCP (01/04/91)
>/* ---------- "favorite SCSI controller chips" ---------- */ >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. Actually, if you are design engineer working on an AT bus type implementation the AIC-6260 is a better choice. It has the AT bus built in and a much better software interface than the 6250. It does everything the 6250 does plus some more stuff. It also support FAST SCSI-2. > Next 6 months: Adaptec with SCSI-2 chips (SCSI compatible connectors). The AIC-6251 chip is out and also support FAST SCSI-2. Roy Neese Adaptec Senior SCSI Applications Engineer UUCP @ neese@adaptex uunet!cs.utexas.edu!utacfd! {nominil,merch,cpe}!adaptex!neese uunet!mlite!adaptex!neese
ts@cup.portal.com (Tim W Smith) (01/05/91)
The NCR 53C710 should be considered in this thread. Especially if one considers total time to execute a command, rather than just the time spent in the data phase. Tim Smith