----- Original Message ----- From: "Rob Clarke" <email@example.com> To: <firstname.lastname@example.org> Sent: Wednesday, February 15, 2017 3:41 PM Subject: Re: Need an 8280 formatted 8" disk (progress!) > ...The 8280 needs double sided disks, as it explicitly says > "Double sided diskettes must be used and must be formatted with the > HEADER command before using for system operation. "at the beginning of > section 4 on the CBM_8280_Specifications.pdf document on your site Bo. Yeah, what confused me was this spec, also on Bo's site: http://www.zimmers.net/cbmpics/dlieee2.html Model : 8280 Type : Dual 8" Floppy Disk Media : Single Sided, Double Density Capacity : 1024K per disk, or 2048K total Interface: IEEE-488 Dos : CBM DOS 3.0 Notes : Huuuuuugggggggeeee!!!!> I tried last night to cut my own index hole using a google > image of a double sided disk as a measurement reference, but failed. :-( Maybe try making it a little larger in case it's misaligned a bit? Size is not really critical as long as the index sensor can see the LED. > Mike S., the drives in my 8280 are TM848-2's, which are the double sided > ones but which are *not* MPU controlled, like the 828-1E and 828-2E. That's what I assumed from looking at Andre's picture, but the specs and users manual on Bo's site are for the 848-E. Good luck! m > > cheers, Rob > > > On 15/02/2017 21:01, Mike Naberezny wrote: >> On 2/15/17 11:20 AM, Bo Zimmerman wrote: >>> The disk also has a write-protect tab on the bottom-right of the >>> disk, near >>> where the read/write exposure strip is. Came right out of the damn >>> box that >>> way. Could the write-protect logic on 8" disks be opposite to 5.25"? >>> That is, >>> write is enabled when the tab is covered, and disabled when exposed? >> >> Yes. The write protect notch on 8" disks has the opposite behavior of >> 5.25" disks. I recently repaired a CGRS Microtech PEDISK II 8" disk >> system for PET. I had to work through the same issues with the index >> hole location and write protect notch. >> >> Now that my PEDISK II system is working, I can provide a known good 8" >> single sided, soft sectored, single density (FM) formatted disk with >> 77 tracks, 26 sectors per track, and a 128 byte sector length. Disks >> from my system have been successfully read on another. The filesystem >> is not be compatible with CBM drives but the disk can be used to test >> sector read and write. >> >> Regards, >> Mike >> > > > Message was sent through the cbm-hackers mailing list Message was sent through the cbm-hackers mailing listReceived on 2017-02-15 22:00:02
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