A1200 DF0 and DF1 swapping help needed pls

[Dave11674]

Hi guys
i did the DF0-DF1 mod
but i cant seem to get anything from the external drive if the floppy or gotek is in there.
anyone ever done this to the A1200 ?
im not 100% sure if the external resistor i removed is the one for sel1
i used my multi meter to beep it back tot he pin
so i "think" its the correct one.


any help here greatly appreciated


ps both drives work ok internally.


but i want my gotek in the external enclosure.


thanks


dave

[Dave11674]

few more pics.
i saved the resistor as you can see by one of the pics.
so no worries putting it back if it was the wrong line removed :S


dave

[Leon Besson]

I’m not getting what you are doing here Bromigo?!

Are you attempting 2 internal drives 1 as DF0: and and 1 as DF1: ? But using the internal Floppy drive header? And a switch?

But I’m now confused about GOTEK in a external case bit?

I’ve done the 2 drives as 1 DF0: at a time with the internal header. Df0: and Df1: but using the internal and external connector inside a tower case.

And I’ve actually got a Micronik adapter that allows 2 internal drives to be used as DF0: and Df1: in a Infinitiv case.

[Daedalus]

The modification is to enable the use of a Gotek on the external floppy port that can also be set as DF0: so games can be booted from it.

[Dave11674]

its so i can keep the amiga internals pretty much stock (floppy)
but i want to switch sel0 and sel1 around on the CIA chip so i put the gotek into the external caddy case and that be set as sel0 (DF0) and the internal floppy then takes on the role as DF1

hope your following

dave

[Leon Besson]

Ahhh… Right! Got it now. Wasn’t aware of this mod.
Sorry can’t help on that one

[Dave11674]

if i get it sussed will post up a how to

dave

[solarmon]

Show the schematic you are using for this mod. What type of switch are you using and what are the connections.

[Dave11674]

all in the pics above mate
im following the ABBA details from the A600
the switch is a DPDT switch 6 pin.
i beeped the sel1 pin from the CIA to the resistor so i know ive taken the correct one off
again shown in the pics above

thanks

dave

[Stedy]

Hi, the original, mechanical floppy drive will only respond as DF0: due to the MTR0 signal (PIN 16 of floppy cable) only working for DF0:. You've connected to the right places, just the mod won't work.

To use the mechanical floppy drive external, you need something like my circuit here:
https://github.com/istedman/Floppy_a..._schematic.png, IC1-IC3 swap the MTR signal around from internal to external, if needed.

I have zero stock of the PCBs at the moment, sorry.

[Dave11674]

could do with one of your pcbs mate if they are easy enough to install.


so on a side note, my install is correct, its just not compatible on the A1200 like it is on the A500/600 ?


thanks


dave