RE: Help with a 8050 drive

From: Mark Zablocki (
Date: 2007-05-14 14:16:29

Hi Ethan,
I'm using new Athana 5.25 disks with the 8050. They should work fine.
I found the following information in the 8050 Troubleshooting Guide at
     PROBLEM: drive appears to load but won't run.
     SOLUTION: check 6532s and UK3 controller ROM.
     PROBLEM: drive won't write/format.
     SOLUTION: check write protection tab in disk and switch on drive.
                     check write circuitry on analog board.
                     check write enable on digital board.
Unfortunately, I have no idea where these circuits are located or how to check them. I don't even know where to find parts.
I appreciate any and all help.
> Date: Sun, 13 May 2007 22:48:26 -0400> From:> To:> Subject: Re: Help with a 8050 drive> > On 5/13/07, Mark Zablocki <> wrote:> >> > Hi Bill,> >> > I'm using a Commodore 8032. I was told that the 8050 was designed to work with the 8032.> > The 8050 will work fine with any PET except, I'm assuming, an> un-upgraded v1 ROM 2001 (due to bugs in the IEEE routines in the> original ROMs). BASIC 4 has a number of commands that make it easier> to use diskette drives, but even a 3001/2001-16 or -32 will talk to an> 8050 just fine (but you'll have to load a DOS Wedge or use a lot of> PRINT# statements).> > From your description, it's not entirely clear what's up with your> drive - do you have any disks to attempt any read tests? If you have> a problem with the write side of your analog electronics, then a> HEADER (N0:...) is not going to succeed. If you can't read a> known-good disk, then no amount of write testing i!
 s going to reveal> your problems (unless you have another known-good 8050 next to the> first one to test how the first one writes).> > Considering the 8050 is either a 96tpi or 100tpi drive (depending on> the exact brand of 5.25" mechanism installed, IIRC), it's a much> higher density than a 4040 or 1541. Are you using suitable media? I> can see how a format test would fail with a working drive and bad> media.> > -ethan> > Message was sent through the cbm-hackers mailing list
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