Amiga 2000 with both internal converted PC Floppy Drive and Gotek Drive

slaanesh_v2 · 05 January 2022, 01:30

So I have an Amiga 2000 ref 6.2 board which also has a GVP Combo 030 accelerator and HD8+ HD card using a SCSI2SD card.

My floppy drive was no longer working. I tried fixing it: both thorough cleaning, lubrication and cap change but to no avail.

So I went down the PC floppy conversion route. I found a suitable drive, converted it and it works a treat - very happy with this.

I also added a Gotek drive (with a rotary knob, running FlashFloppy with firmware 3.29) but I can't get the two to work with each other.

I've set the J301 to 2x drives, checked my cable which is a true amiga cable (which I suspect is part of the problem) and having DS0/DS1 jumpers set correctly on the PC FD and the Gotek.

I can get the PC FD to work fine as DF0: but the Gotek remains as DF1:????

Is this to do with pin header incompatibility on the PC FD not playing nice with having two devices on the same cable?

Any advice would be appreciated.

NOTE: I realize I could have the Gotek as external using an adapter but I kind of wanted a neat solution so that both drives are internal.

LIV2 · 05 January 2022, 09:30

Are you sure you have the Gotek jumpered correctly? on the Gotek as DF1 it should have S1 jumpered, and not S0 or MO

slaanesh_v2 · 05 January 2022, 10:10

Yes the Gotek jumpers are set correctly. I have tried as both DF0 and DF1 and setting jumpers on both devices appropriately.

Stedy · 05 January 2022, 16:34

Hi,

I can see the problem, not 100% on the fix.

The A1500, A2000 and A3000 have the INUSE1 signal driven on pin 14 of the 34 way FDD connector. This is uncommon and they are the only Amiga models I've found this feature on (other have this as no connect). On a PC floppy or Gotek, pin 14 is SELA. PC drives are jumpered to use SELB to select drive A then the twist in the cable makes a cable jumpered to drive B respond as B: without changing jumpers.

Your GOTEK drive maybe responding to SEL0/A and INUSE1/SELB at the same time and has an identity crisis!

Will need to think of the simplest solution. A PC cable won't fix it.

slaanesh_v2 · 06 January 2022, 05:06

Here is some additional info I found in another thread:

http://eab.abime.net/showthread.php?p=1233067

It shows the Amiga 2000 with pin 13/14/15 as blank (NC?)
It also shows INUSE0/1 as being on pins 4 and 6 which makes sense as this is the bit that's twisted/reversed on a normal Amiga Floppy cable.
ie. INUSE is on separate lines going back to the Amiga.

@Stedy Are you saying that INUSE1 is repeated on pin 14? If that's the case could just cut pin 14?

Stedy · 06 January 2022, 16:44

Hi,

You could cut pin 14 and see if it works. Perhaps the less drastic fix is to cut pin 14 on the floppy drive cable where it plugs into the Amiga. Most drives do not use the INUSE signals, I have a few technical manuals for FDDs here I checked against.

slaanesh_v2 · 09 January 2022, 23:25

Okay I will give it a try at some point - I recently just packed away my Amiga 2000 (limited bench space!) to make room for some other projects.

Seeing as 14/15 seems to be "NC" it shouldn't hurt, right?

I may cut it on the PC floppy instead as it's already modified to suit the Amiga. I'm never going to use it on a PC anyway and 14/15 are supposedly NC on the Amiga.

Will report back when done and tested.

slaanesh_v2 · 14 January 2022, 22:57

So I had a look at the PC floppy drive that I am using. I've attached a photo close up of the FD's motherboard. Pin 1 of the connector is labeled. If you count to pin 14 you will see it's not connected.
So this isn't the issue.

Any other suggestions anyone?

BTW - You can see the there are a couple mods. The wires were soldered in place to make this PC drive Amiga compatible.There's also a trace that's been cut from Pin 1 and DS1 solder blob jumper was moved to DS0.
For reference the FD is an ALPS ELECTRIC DF354H090F.

LIV2 · 15 January 2022, 14:01

If you disconnect the floppy drive do you find that the gotek responds as DF0 (without changing the gotek jumpers)?

On my A2000 I have an original floppy drive and a gotek. All I had to do was set the Gotek to have SEL1 jumpered instead of SEL0

slaanesh_v2 · 16 January 2022, 22:27

I tried a lot of combos initially and I could easily get one drive to work either the Gotek or the FDD but not both together.
I think I was setting the jumpers as required including J301 on the A2000 mono as that tells the Amiga that there are two drives set.
@LIV2 did you set/change J301 at all?

05 January 2022, 01:30	#1
slaanesh_v2 Registered User Join Date: Dec 2021 Location: Australia Posts: 6	Amiga 2000 with both internal converted PC Floppy Drive and Gotek Drive So I have an Amiga 2000 ref 6.2 board which also has a GVP Combo 030 accelerator and HD8+ HD card using a SCSI2SD card. My floppy drive was no longer working. I tried fixing it: both thorough cleaning, lubrication and cap change but to no avail. So I went down the PC floppy conversion route. I found a suitable drive, converted it and it works a treat - very happy with this. I also added a Gotek drive (with a rotary knob, running FlashFloppy with firmware 3.29) but I can't get the two to work with each other. I've set the J301 to 2x drives, checked my cable which is a true amiga cable (which I suspect is part of the problem) and having DS0/DS1 jumpers set correctly on the PC FD and the Gotek. I can get the PC FD to work fine as DF0: but the Gotek remains as DF1:???? Is this to do with pin header incompatibility on the PC FD not playing nice with having two devices on the same cable? Any advice would be appreciated. NOTE: I realize I could have the Gotek as external using an adapter but I kind of wanted a neat solution so that both drives are internal.

06 January 2022, 05:06	#5
slaanesh_v2 Registered User Join Date: Dec 2021 Location: Australia Posts: 6	Here is some additional info I found in another thread: http://eab.abime.net/showthread.php?p=1233067 It shows the Amiga 2000 with pin 13/14/15 as blank (NC?) It also shows INUSE0/1 as being on pins 4 and 6 which makes sense as this is the bit that's twisted/reversed on a normal Amiga Floppy cable. ie. INUSE is on separate lines going back to the Amiga. @Stedy Are you saying that INUSE1 is repeated on pin 14? If that's the case could just cut pin 14? Last edited by slaanesh_v2; 06 January 2022 at 05:22. Reason: Added a bit of info and question to Stedy

14 January 2022, 22:57	#8
slaanesh_v2 Registered User Join Date: Dec 2021 Location: Australia Posts: 6	So I had a look at the PC floppy drive that I am using. I've attached a photo close up of the FD's motherboard. Pin 1 of the connector is labeled. If you count to pin 14 you will see it's not connected. So this isn't the issue. Any other suggestions anyone? BTW - You can see the there are a couple mods. The wires were soldered in place to make this PC drive Amiga compatible.There's also a trace that's been cut from Pin 1 and DS1 solder blob jumper was moved to DS0. For reference the FD is an ALPS ELECTRIC DF354H090F. Attached Thumbnails

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05 January 2022, 09:30	#2
LIV2 Tinkerer Join Date: Jan 2020 Location: NZ Posts: 105	Are you sure you have the Gotek jumpered correctly? on the Gotek as DF1 it should have S1 jumpered, and not S0 or MO

05 January 2022, 10:10	#3
slaanesh_v2 Registered User Join Date: Dec 2021 Location: Australia Posts: 6	Yes the Gotek jumpers are set correctly. I have tried as both DF0 and DF1 and setting jumpers on both devices appropriately.

05 January 2022, 16:34	#4
Stedy Registered User Join Date: Jan 2008 Location: United Kingdom Age: 46 Posts: 735	Hi, I can see the problem, not 100% on the fix. The A1500, A2000 and A3000 have the INUSE1 signal driven on pin 14 of the 34 way FDD connector. This is uncommon and they are the only Amiga models I've found this feature on (other have this as no connect). On a PC floppy or Gotek, pin 14 is SELA. PC drives are jumpered to use SELB to select drive A then the twist in the cable makes a cable jumpered to drive B respond as B: without changing jumpers. Your GOTEK drive maybe responding to SEL0/A and INUSE1/SELB at the same time and has an identity crisis! Will need to think of the simplest solution. A PC cable won't fix it.

06 January 2022, 16:44	#6
Stedy Registered User Join Date: Jan 2008 Location: United Kingdom Age: 46 Posts: 735	Hi, You could cut pin 14 and see if it works. Perhaps the less drastic fix is to cut pin 14 on the floppy drive cable where it plugs into the Amiga. Most drives do not use the INUSE signals, I have a few technical manuals for FDDs here I checked against.

09 January 2022, 23:25	#7
slaanesh_v2 Registered User Join Date: Dec 2021 Location: Australia Posts: 6	Okay I will give it a try at some point - I recently just packed away my Amiga 2000 (limited bench space!) to make room for some other projects. Seeing as 14/15 seems to be "NC" it shouldn't hurt, right? I may cut it on the PC floppy instead as it's already modified to suit the Amiga. I'm never going to use it on a PC anyway and 14/15 are supposedly NC on the Amiga. Will report back when done and tested.

15 January 2022, 14:01	#9
LIV2 Tinkerer Join Date: Jan 2020 Location: NZ Posts: 105	If you disconnect the floppy drive do you find that the gotek responds as DF0 (without changing the gotek jumpers)? On my A2000 I have an original floppy drive and a gotek. All I had to do was set the Gotek to have SEL1 jumpered instead of SEL0

16 January 2022, 22:27	#10
slaanesh_v2 Registered User Join Date: Dec 2021 Location: Australia Posts: 6	I tried a lot of combos initially and I could easily get one drive to work either the Gotek or the FDD but not both together. I think I was setting the jumpers as required including J301 on the A2000 mono as that tells the Amiga that there are two drives set. @LIV2 did you set/change J301 at all?

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