jumper settings for Chinon FZ-354 floppy

From: Don Maslin <donm_at_cts.com>
Date: Sat Aug 30 14:36:01 2003

On Sat, 30 Aug 2003, Ralph E. Dodd wrote:

> Hello all,
> I finally set up my SWP ATR8000 last night. This device allows an Atari
> computer to use standard floppy drives along with Atari proprietary drives.
> Included with the ATR8000 was an external floppy case with power supply that
> can hold 2 half height 5 1/4 floppies. It had 1 Shugart SA455 5 1/4 DSDD drive
> and I added (after hours of drilling and filing) a Chinon FZ-354 3 1/2 DSDD.
> I put the Chinon on the end of the cable set at drive 3. I removed the
> resistor pack from the Shugart and added a switch using old motherboard cables
> so I can change the drive id from 1 to 2. This is so I can boot CP/M from the
> Shugart as drive 1 or switch it to drive 2 and boot from an Atari drive. I
> had no trouble using the Shugart drive but the Chinon gave me a lot of
> problems. After a little research on the net, I changed the jumper from DC to
> RDY (this sounded like the answer) but I still got errors. The errors
> occurred after I rebooted and wrote to the same disk. Every file from the
> second write was messed up. The only jumpers left were MM and MD so I changed
> the jumper from MM to MD and it works great now. My big question is what are
> the MM and MD settings for, and how did this solve my problem? From what I've
> read, 3 1/2 drives don't have removable resistor packs and they somehow
> achieve termination automatically so that's why I put the Chinon at the end of
> the cable. Thanks for listening to my raving. By the way, does anyone have
> the CP/M disks for this setup for sale or for trade?
> Ralph

The attached TeleDisk image in conjunction with a copy of TeleDisk
and a DOS PC with 5.25" drive will give you a DSDD version of
CP/M-2.2 for your ATR8000. If the PC's 5.25" drive is a 1.2mb
unit, you will want to make working disks on the Atari to get a
true 48tpi disk.

                                                - don

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Received on Sat Aug 30 2003 - 14:36:01 BST

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