heiden@kbomfg.DEC.COM (MATTHIAS HEIDEN, DEC KAUFBEUREN, # 08341/ 913392) (04/07/88)
Is there any problem with replacing the Adaptec 4000 controller in the SH204
by the 4070 model and using an ST506 RLL drive ? What about transfer rate ?
Can the ATARI - SCSI interface catch up ?
Does somebody have the specification for these controllers or may be even
the address of Adaptec ?
many thanks,
Matthias Heidenwes@obie.UUCP (Barnacle Wes) (04/11/88)
In article <8804062128.AA02500@decwrl.dec.com>, heiden@kbomfg.DEC.COM (MATTHIAS HEIDEN, DEC KAUFBEUREN, # 08341/ 913392) writes: > Is there any problem with replacing the Adaptec 4000 controller in the SH204 > by the 4070 model and using an ST506 RLL drive? I'm sure you'd have to patch or modify the device driver software, since the RLL disk will have more sectors/track than the standard ST506. There was mention of a German magazine article with source to a hard disk device driver in it a couple of days ago, you might be able to modify that. Does anyone know if the current Supra drivers support RLL controllers? > What about transfer rate? Can the ATARI - SCSI interface catch up? The AHDI part should be a problem, but then only way to tell if your SCSI->AHDI interface board is fast enough is probably to test it. -- /\ - "Against Stupidity, - {backbones}! /\/\ . /\ - The Gods Themselves - utah-cs!utah-gr! / \/ \/\/ \ - Contend in Vain." - uplherc!sp7040! / U i n T e c h \ - Schiller - obie!wes
dclemans@mntgfx.mentor.com (Dave Clemans) (04/11/88)
From article <8804062128.AA02500@decwrl.dec.com>, by heiden@kbomfg.DEC.COM (MATTHIAS HEIDEN, DEC KAUFBEUREN, # 08341/ 913392): > > Is there any problem with replacing the Adaptec 4000 controller in the SH204 > by the 4070 model and using an ST506 RLL drive ? What about transfer rate ? > Can the ATARI - SCSI interface catch up ? > Does somebody have the specification for these controllers or may be even > the address of Adaptec ? > > many thanks, > Matthias Heiden The Adaptec 4070 works fine with the ST. Make sure you have a drive that can support RLL. dgc
dclemans@mntgfx.mentor.com (Dave Clemans) (04/18/88)
The Supra & ICD drivers both handle RLL disks fine. The higher bit-rate from a RLL disk only affects the ST-506 -> Adaptec 4070 path, NOT the Adaptec 4070 -> AHDI path; that transfer rate remains the same. Remember that the Adaptec does local sector buffering. Regardless all the AHDI adaptors I've seen should be able to handle the full bandwidth of the ST DMA bus (10 megabits). dgc