----- Original Message ----- From: "Rob Clarke" <firstname.lastname@example.org> To: <email@example.com> Sent: Wednesday, February 15, 2017 6:31 PM Subject: Re: Now have a 8280 formatted 8" disk (success!) > Woo-hoo! It works. :-) > > Following Mike S's comment I made my punched hole a bit bigger and now > it's formatting successfully, but wow it is slow! It takes around 12 > minutes and 40 seconds to complete, so several times longer than a 1541. > It seems to be a 2 pass format process. The first pass is quite fast, > taking about 20 seconds to step through the 77 tracks, but the second > pass is very slow, taking around 9 seconds per track. I seem to remember > reading somewhere that tha BAM maps out bad sectors, so I'm guessing > that the second pass is checking for bad sectors. When it completes the > second pass, the head steps backwards and forwards several times before > finally finishing. > > Also, it takes a very long time the first time you read the directory > with the head stepping several times, but whern it does I get: > > 0 "test disk " 99 3a > > 3946 blocks free. > > So the main finding from this is that it must be a double sided disk, if > you use a single sided, it will fail with a read error. > > cheers, Rob > > > On 15/02/2017 22:54, Mike Stein wrote: >> ----- Original Message ----- >> From: "Rob Clarke" <firstname.lastname@example.org> >> To: <email@example.com> >> 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 list > > > Message was sent through the cbm-hackers mailing list > Message was sent through the cbm-hackers mailing listReceived on 2017-02-16 03:00:02
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