A4000 & 2nd 1.76MB floppy

[jimbo100]

I have got two HD floppy disk drives installed, however DF1: will need read any Amiga Disks (DD or HD)

DF0: is jumpered as DS0 and DF1: is jumpered as DS1. I have the floppy cable with the twist at 4 & 6 and J351 is open as per the A4000 manual. (I have tried it with J351 closed but the result is the same) The floppy cable has DF0: in the middle and DF1: at the end.

Now if I swap jumpers and turn DF0: to DF1: it becomes the dud drive and DF1: to DF0: becomes the 1.76MB drive so I know both work ok. Both drives are Chinon FZ-357A models.

Anyone got any ideas on how to get DF1: to correctly read Amiga disks. I did this 13 years ago and I don't remember having this kind of problem!

Why won't DF1: work?

[Jope]

Per your description, you seem to be doing it right.

Try both mechanisms as DF0/DS0 on the connector before the twist (all connections straight through). Leave J351 open.

[jimbo100]

Originally Posted by Jope

Per your description, you seem to be doing it right.

Try both mechanisms as DF0/DS0 on the connector before the twist (all connections straight through). Leave J351 open.

If I leave them both as DS0 all that happens is the drive light comes on for both of them for DF1: but it still wont read the disc!

Done everything possible to get it to work. I have now tried it on another A4000 and they both work fine. So it appears there is something wrong with this A4000, but what?

[Jope]

CIA trouble, perhaps.

When I meant try both mechanisms as DF0 on the connector before the twist, I meant try both alone, one at a time..

But yeah if you can get the setup working with the same cable on another A4000, it's a problem with the machine.

[jimbo100]

Originally Posted by Jope

CIA trouble, perhaps.

When I meant try both mechanisms as DF0 on the connector before the twist, I meant try both alone, one at a time..

But yeah if you can get the setup working with the same cable on another A4000, it's a problem with the machine.

Yep done that, they both work alone fine, they just wont work together. I thought Paula controlled the floppy's

[Jope]

The drive selects, and some other stuff come from the CIA. Check your schematics. :-)

[ceaser]

I'm digging around I think there is something wrong with the floppy cable that shipped with A4000 originally. The cable is made up wrong. I'm having the exact same problem with two Chinon FZ-357 drives. It's NOT a chip.

[Jope]

The A4000 hardware guide indeed mentions this. The twist talked about in there mainly affects the way the FDD LEDs light up.

If yours is wrong, it doesn't do harm to twist it correctly.

[ceaser]

i tried virtually every jumper setting. and a regular floppy ribbon cable broke on me. That's a first. At least nothing in the way of pins broke off one of my Chinon FZ 357's or the motherboard IDE pins. I think it's the cable thing :/

I might have to rob it off one of my running PC's.

i might not be right, but i think this is it

30 minutes later: i found a longer floppy cable. i get the feeling this came with one of the two A4000's that I bought. But this one was much longer than the one I was trying before. In fact I think this one IS the A4000 original floppy cable. So we have 2 Chinon FZ 357 working now. I jumpered them as DS0 for top of the 2 (middle of cable) and DS1 for bottom of the 2 (end of the cable)

Cheers