rkh@mtune.ATT.COM (Robert Halloran) (09/10/88)
Has anyone tried 'rolling their own' SCSI hard disks for an Apple ][? I'm debating whether to buy an already-packaged drive vs. a 'bare' SCSI drive and power supply for my GS. What drives/controllers/software were used? What (if any) major problems were encountered? Please reply only by e-mail. I'll summarize if there's enough interest. Thanks to all in advance. Bob Halloran ========================================================================= UUCP: att!mtune!rkh Internet: rkh@mtune.ATT.COM Apple ConsumerLink: RobertH107 GEnie:R.HALLORAN USPS: 19 Culver Ct, Old Bridge NJ 08857 DDD: 201-251-7514 eve ET Disclaimer: If you think AT&T would have ME as a spokesman, you're crazed. Quote: "History is made at night. Character is what you are in the Dark." - Dr. Lizardo/John Whorfin, "Buckaroo Banzai" =========================================================================
nelson@dad.UUCP (Paul Nelson) (09/13/88)
in article <7841@mtune.ATT.COM>, rkh@mtune.ATT.COM (Robert Halloran) says: > > Has anyone tried 'rolling their own' SCSI hard disks for an Apple ][? > I'm debating whether to buy an already-packaged drive vs. a 'bare' SCSI > drive and power supply for my GS. What drives/controllers/software were > used? What (if any) major problems were encountered? > I own a CMS 60M hard drive with a CMS scsi interface. After reading alot about building your own scsi hard drive, I opened up my CMS drive to look inside. I was quite suprised to find that it contained only a power supply, a seagate st277N ( i'm not sure of the exact model number), and a small pc board cable adapter to convert the seagate's 50 pin ribbon to the 25 pin apple type scsi cables. the seagate drive has a built-in scsi interface and has only the 50 pin scsi i/f cable, a small cable that is wired to jumpers for address selection, and a cable for power. The hard drive itself would not be hard to make. You could probably buy the parts for around $600. The problem is with the scsi i/f card for the computer end. You can buy one from CMS for under $200 ( i think, i haven't asked a dealer, but my CMS hard drive was packaged for a Mac and the scsi i/f card came from another package somehow... the dealer did the dirty work) The real question is this: I would like to have Apple's scsi card, but I don't think that I could use it with a 60M drive, since it would want to access the disk as one volumn (i'm assuming this). Since Prodos won't deal with a volumn that big, I would loose half the disk. The CMS i/f card makes the 60M drive look like two 30M drives to Prodos, so you can access the whole disk. I would like to get some more info on how the apple scsi card talks to disks: what is the largest disk size? how does it find the disk (how do you tell it that address xx is a disk)? Could I write my own drivers for accessing scsi disk drives or any other scsi device? If anyone with an apple scsi knows the scoop, please let me know. Paul Nelson ...tikal!dad!nelson
jla@hogbbs.Fidonet.Org (Slartibartfast) (09/17/88)
I also have a similar question.... I was looking at an add for a SeaGate
St-225n (SCSI) drive and was wondering if I got a SCSI card and some hard
drive utils (ProSel) if it would work. Does the ST-225N have its own power
supply? If not no big deal (I have one)? The drive is being sold be Hard
Drives International, in Temple AZ.
Thanks in advance,
Jim Anderson
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