Using an internal Gotek and an external disk drive

[rubber_jonnie]

Have a look at the schematics, IIRC there are some drive select jumpers on the mainboard.

[sandord]

Maybe I did something wrong before but I've got the external drive working with my ST that has a Gotek installed.

So now the test matrix is like this:

Screenshot 2025-05-25 145343.png

This leads me to think there is an STE-specific issue going on here.

Maybe I should simplify things and leave the Gotek out of the equation first and figure out why the external FDD doesn't work with any of my STEs.

[sandord]

I think you need to check the Drive select signals which I think come from the YM chip.

Have a look at the schematics, IIRC there are some drive select jumpers on the mainboard.

I'm not really sure what to check. I know that pins 5 and 6 of the YM are for MS0/MS1. I also know that the W301 and W300 straps are on the PCB and that the pins of those straps are not jumped on my machine.

[sandord]

Check cable?

The problems seem pretty consistent with specific machines working/not working but your suggestion led me to think to use my multimeter to check the pins between both sides of the cable, just to be sure.

[rubber_jonnie]

I think you need to check the Drive select signals which I think come from the YM chip.

Have a look at the schematics, IIRC there are some drive select jumpers on the mainboard.

I'm not really sure what to check. I know that pins 5 and 6 of the YM are for MS0/MS1. I also know that the W301 and W300 straps are on the PCB and that the pins of those straps are not jumped on my machine.

Did you mean they (W300, W301) are not strapped at all or are strapped like this:

Screenshot 2025-05-25 at 14.47.58.png

As that is taken straight from the STE schematic and shows pins 2-3 connected.

[sandord]

Did you mean they (W300, W301) are not strapped at all or are strapped like this:


Screenshot 2025-05-25 at 14.47.58.png


As that is taken straight from the STE schematic and shows pins 2-3 connected.
[/quote]

PXL_20250525_1155390762.jpg

They don't look strapped at all.

[rubber_jonnie]

They don't look strapped at all.

Looks like pins 2&3 are connected to me, buzz them out with a multimeter to confirm.