Termpower is pin 26, in the middle of the cable... In the board I was using, the was a jumper to set / remove to void sending the termpower through the cable... I remember the terminator on SASI But I donâ€™t remember the termpower.. I'm not sure but I think this pin was connected to GND... I confirm, in my documents, there is no termpower on sasi Pins 20 to 30 are marked "for future use" That's probably why on scsi adapter it was possible to remove the termpower. I found this document: http://ia601603.us.archive.org/23/items/bitsavers_ansiX3T9SA_2034617/SASI_revC_Jan82.pdf about SASI (1982) about the period I was working on SASI/SCSI... -- didier -----Message d'origine----- De : firstname.lastname@example.org [mailto:email@example.com] De la part de Ted EnvoyÃ© : mardi 2 avril 2013 18:16 Ã€ : firstname.lastname@example.org Cc : Ethan Dicks Objet : Re: D9060 Hard drive It didn't actually melt the copper wire, just the insulation. On 4/2/2013 12:12 PM, Ethan Dicks wrote: > On Tue, Apr 2, 2013 at 11:51 AM, Ted<email@example.com> wrote: >> I got the bright idea of just bypassing the MFM to SCSI board and >> installing a SCSI drive directly to the DOS board. The cable started >> melting immediately. I have ordered a new cable and hope I did not >> fry the DOS board. > You probably had both ends of the cable trying to provide TERMPWR. > > What part of the cable melted? (what SCSI pins?) > > There are small differences between the packet commands for SASI and > SCSI-1. There are plenty of differences between SASI and SCSI-2. > >> I did try plugging in a SCSI connector to connect the drive an >> Winchester2SCSI board. Windows 7 could not recognize it. > That is entirely unsurprising. Among other things that older bridge > cards do not support (even SCSI-1) is the IDENT packet that pretty > much all modern systems use to request the drive self-report its > geometry. Back in the old days, you had to tell the OS how large the > disk was and it trusted you. > Later, SCSI (and IDE) devices got smart enough that the OS could ask > the drive and not force the human to know the geometry. > > Even the modern Linux drivers require IDENT to be there. > > Old UNIX (4.1BSD for example) and non-mainstream OSes like AmigaDOS > let you/make you specify the drive geometry and could be used (if the > command packets sent from the OS driver are compatible with what the > drive supports) to raw-read the drive. > > Of course, there's one other wrinkle... the drive in the > D9060/D9090 uses 256 byte sectors, *not* 512 byte sectors, which > commonly confounds modern OS drivers. > > -ethan > > Message was sent through the cbm-hackers mailing list Message was sent through the cbm-hackers mailing list Message was sent through the cbm-hackers mailing listReceived on 2013-04-02 20:00:04
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