Dual Internal Floppies on a A2000HD Rev 6.2

EvilCensor · 17 June 2010, 22:45

Bought an A2000 from EBay and I'm having trouble getting both floppy drives working.

After a lot of hassle getting the guy to actually ship the item it arrived today - all cards floating in the case.. everything thankfully works (to the naked eye at least) except the two internal floppy drives.

They are daisy chained off a single floppy cable with two headers - the way I received it - no disk was sensed in WorkBench.. however individually they seem fine (connecting one to the end of the floppy cable at a time).

Probably a basic issue but can anyone suggest anything?

EvilCensor · 17 June 2010, 23:13

Closing jumper 301 make DF1 come up as bad in Workbench even without disk in it.

prowler · 17 June 2010, 23:30

Quote:

Originally Posted by EvilCensor

They are daisy chained off a single floppy cable with two headers - the way I received it - no disk was sensed in WorkBench.. however individually they seem fine (connecting one to the end of the floppy cable at a time).

Probably a basic issue but can anyone suggest anything?

Has the floppy cable got a twist in it between one floppy drive connector and the other, or between the motherboard connector and the first floppy connector, or both?

If it has one or two twists, and both floppy drives work individually when connected to the end of the cable, then they should both work when both are connected to the cable.

If the cable has no twists, then you need to change the drive select on one drive from DS0 to DS1, or vice-versa, to get them working.

EvilCensor · 17 June 2010, 23:57

Now that jumper 301 is closed DF0 works fine, DF1 comes up as DF1:BAD in WorkBench even when no disk is in.

There is one twist in cable as you can see in this picture:

and both drives have the same jumper settings (bad pic sorry):

prowler · 18 June 2010, 00:35

If the drive responding as DF0: is connected after the twist, then I have no idea why DF1: isn't working. It really should be okay like that.

EvilCensor · 18 June 2010, 00:39

The jumper settings for both drives should be the same?

prowler · 18 June 2010, 00:50

Yes, the cable twist changes the Drive Select address for the drive connected after the twist.

How many wires are twisted in that cable (it looks like only three in the picture)? I suspect it should be more than that...

EvilCensor · 18 June 2010, 00:54

Yes, only 3 wires are twisted.. wires 4,5,6.

prowler · 18 June 2010, 00:57

Do you have a dual floppy drive cable from a PC? I see no reason why one of those should not work. All PC floppy drives (both 3½-inch and 5¼-inch) are shipped with Drive Select set to DS1.

I have one here, and it has wires 10-16 twisted between the first and second floppy drive connectors. Could you try one of those?

EvilCensor · 18 June 2010, 03:16

Yes I have a PC one that has wire 10 to 16 reversed but I'm not really comfortable trying that.

I've taken out an A2088XT board and I'm wondering if the installation of that required any other kind of jumper change as it included a 5 1/4 floppy also (which I've removed).

lugosi · 18 June 2010, 07:49

Change the jumper on the back of DF1 to the two lower left pins, leave the one on DF0 on the two lower right, that should do the trick.

I just tested this on my A2000 - it uses a floppy-cable with a twist, but *still* requires the right jumper settings on the drives, else I get "DF1: BAD".

Jope · 18 June 2010, 11:49

The twist in Amiga cables is there only so that the drive leds work independently. You have to jumper DF0 as DS0 and DF1 as DS1 (and install the jumper on the motherboard if DF1 is not a real Amiga compatible HD drive)

EvilCensor · 18 June 2010, 16:44

Thanks for the replies - managed to resolve it last night and lugosi and Jope were correct.

So to sum up, installing two internal Chinon FB-354 (A2010) floppy drives in an A2000 (for those who didn't know):

1) A double headed floppy ribbon cable with wires 4-5-6 twisted at the end (red wire = 1) works fine.

2) Depending on what motherboard you have:

A2000 Motherboard P/N 312723 only

You'll need to close jumper J301 to enable your second internal drive - which is located right next to the spot where you attach the ribbon cable to your motherboard.

A2000 Motherboard P/N 380705-01 only

You'll need to close jumper J36 to enable your second internal drive, this is located under your A2000 power supply which will need to be removed to access it.

3) The Chinon FB-354 drives I'm using have 6 jumper pins (2 rows of 3) located between the 4 power pins and the 34 data pins.

Transposing the jumper settings from one drive to another changes DF0: to DF1: and vice versa.

prowler · 18 June 2010, 23:37

Thanks for confirmation that you got both floppy drives working in your A2000HD with that cable, and for the details of how you achieved it!

Rod_cl · 03 May 2021, 02:59

Reviving this old thread. I was able to get rid of the df1:bad icon on the os 1.3 screen but the internal df1: doesn't work.
I doesn't read the disks, just 3 clicks and it says disk cant be read. I could initialize a disk but it failed when reading with the same error.
Its a chinon FB-354 (original). You guys think a recap and head cleaning would repair this?
Best,

Rodrigo

TjLaZer · 03 May 2021, 03:43

First thing you need to do is confirm that the drive works, so swap it out with the internal one and test it.

17 June 2010, 22:45	#1
EvilCensor A1000 User Join Date: Oct 2008 Location: Austin, US Posts: 51	Dual Internal Floppies on a A2000HD Rev 6.2 Bought an A2000 from EBay and I'm having trouble getting both floppy drives working. After a lot of hassle getting the guy to actually ship the item it arrived today - all cards floating in the case.. everything thankfully works (to the naked eye at least) except the two internal floppy drives. They are daisy chained off a single floppy cable with two headers - the way I received it - no disk was sensed in WorkBench.. however individually they seem fine (connecting one to the end of the floppy cable at a time). Probably a basic issue but can anyone suggest anything?

17 June 2010, 23:13	#2
EvilCensor A1000 User Join Date: Oct 2008 Location: Austin, US Posts: 51	Closing jumper 301 make DF1 come up as bad in Workbench even without disk in it. Last edited by EvilCensor; 17 June 2010 at 23:17. Reason: Still have issue - not resolved as previously thought.

17 June 2010, 23:57	#4
EvilCensor A1000 User Join Date: Oct 2008 Location: Austin, US Posts: 51	Now that jumper 301 is closed DF0 works fine, DF1 comes up as DF1:BAD in WorkBench even when no disk is in. There is one twist in cable as you can see in this picture: and both drives have the same jumper settings (bad pic sorry): Last edited by EvilCensor; 18 June 2010 at 00:09.

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18 June 2010, 00:35	#5
prowler Global Moderator Join Date: Aug 2008 Location: Sidcup, England Posts: 10,300	If the drive responding as DF0: is connected after the twist, then I have no idea why DF1: isn't working. It really should be okay like that.

18 June 2010, 00:39	#6
EvilCensor A1000 User Join Date: Oct 2008 Location: Austin, US Posts: 51	The jumper settings for both drives should be the same?

18 June 2010, 00:50	#7
prowler Global Moderator Join Date: Aug 2008 Location: Sidcup, England Posts: 10,300	Yes, the cable twist changes the Drive Select address for the drive connected after the twist. How many wires are twisted in that cable (it looks like only three in the picture)? I suspect it should be more than that...

18 June 2010, 00:54	#8
EvilCensor A1000 User Join Date: Oct 2008 Location: Austin, US Posts: 51	Yes, only 3 wires are twisted.. wires 4,5,6.

18 June 2010, 00:57	#9
prowler Global Moderator Join Date: Aug 2008 Location: Sidcup, England Posts: 10,300	Do you have a dual floppy drive cable from a PC? I see no reason why one of those should not work. All PC floppy drives (both 3½-inch and 5¼-inch) are shipped with Drive Select set to DS1. I have one here, and it has wires 10-16 twisted between the first and second floppy drive connectors. Could you try one of those?

18 June 2010, 03:16	#10
EvilCensor A1000 User Join Date: Oct 2008 Location: Austin, US Posts: 51	Yes I have a PC one that has wire 10 to 16 reversed but I'm not really comfortable trying that. I've taken out an A2088XT board and I'm wondering if the installation of that required any other kind of jumper change as it included a 5 1/4 floppy also (which I've removed).

18 June 2010, 07:49	#11
lugosi Registered User Join Date: Jun 2009 Location: Germany Posts: 22	Change the jumper on the back of DF1 to the two lower left pins, leave the one on DF0 on the two lower right, that should do the trick. I just tested this on my A2000 - it uses a floppy-cable with a twist, but still requires the right jumper settings on the drives, else I get "DF1: BAD".

18 June 2010, 11:49	#12
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,862	The twist in Amiga cables is there only so that the drive leds work independently. You have to jumper DF0 as DS0 and DF1 as DS1 (and install the jumper on the motherboard if DF1 is not a real Amiga compatible HD drive)

18 June 2010, 16:44	#13
EvilCensor A1000 User Join Date: Oct 2008 Location: Austin, US Posts: 51	Thanks for the replies - managed to resolve it last night and lugosi and Jope were correct. So to sum up, installing two internal Chinon FB-354 (A2010) floppy drives in an A2000 (for those who didn't know): 1) A double headed floppy ribbon cable with wires 4-5-6 twisted at the end (red wire = 1) works fine. 2) Depending on what motherboard you have: A2000 Motherboard P/N 312723 only You'll need to close jumper J301 to enable your second internal drive - which is located right next to the spot where you attach the ribbon cable to your motherboard. A2000 Motherboard P/N 380705-01 only You'll need to close jumper J36 to enable your second internal drive, this is located under your A2000 power supply which will need to be removed to access it. 3) The Chinon FB-354 drives I'm using have 6 jumper pins (2 rows of 3) located between the 4 power pins and the 34 data pins. Transposing the jumper settings from one drive to another changes DF0: to DF1: and vice versa.

18 June 2010, 23:37	#14
prowler Global Moderator Join Date: Aug 2008 Location: Sidcup, England Posts: 10,300	Thanks for confirmation that you got both floppy drives working in your A2000HD with that cable, and for the details of how you achieved it!

03 May 2021, 02:59	#15
Rod_cl Zone Friend Join Date: Jul 2006 Location: Santiago/Chile Age: 49 Posts: 123	Reviving this old thread. I was able to get rid of the df1:bad icon on the os 1.3 screen but the internal df1: doesn't work. I doesn't read the disks, just 3 clicks and it says disk cant be read. I could initialize a disk but it failed when reading with the same error. Its a chinon FB-354 (original). You guys think a recap and head cleaning would repair this? Best, Rodrigo

03 May 2021, 03:43	#16
TjLaZer Registered User Join Date: Sep 2004 Location: Tacoma, WA USA Age: 52 Posts: 1,916	First thing you need to do is confirm that the drive works, so swap it out with the internal one and test it.

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