Internal drive select

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friijy2001
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Internal drive select

Post by friijy2001 » Sun Jan 17, 2021 1:55 pm

Ok, i'll try to explain this...

I have the following
  • A working Drive A
  • A working Gotek
What I would like to do is to install both as drive A and create a switch to select either Drive A Normal or Drive A Gotek. This gives me an option to later plug in an external B drive without messing around cutting pins etc...

Am thinking to create a board where both drives plug in and power up but then add a switch to switch Pin 10 (Drive 0 select) and 16 (Motor ON) to go to the floppy if I want to use the floppy or the gotek if I want to use the gotek

or do I just need to switch for pin 16 (Motor On).

Will this work?

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exxos
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Re: Internal drive select

Post by exxos » Sun Jan 17, 2021 2:01 pm

You need to switch the drive ID's.. MOTOR ON is better to turn that off as well, but the ST doesn't do that anyway.
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friijy2001
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Re: Internal drive select

Post by friijy2001 » Sun Jan 17, 2021 3:07 pm

So this would not work?
image.jpg
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It’s a shame if not, just trying to install both options inside so it’s nice a neat. Prior to switching on you could then just select which drive a option you would like.

I have a 520STFM by the way.

Shame if it’s not achievable on the STFM.

(Sorry for the simple diagram I hope it makes sense on what I am trying to do)

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Re: Internal drive select

Post by exxos » Sun Jan 17, 2021 3:17 pm

You would need a pull up resistor on both id selects (pin 10) on both drives. Then switch pin 10 on the ST to either of the drives.
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friijy2001
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Re: Internal drive select

Post by friijy2001 » Sun Jan 17, 2021 3:38 pm

Hmm interesting, sounds quite simple to do :) I’ll do a bit more of a detailed diagram to see if my understanding is correct an post up. Thank you for the guidance!

friijy2001
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Re: Internal drive select

Post by friijy2001 » Sun Jan 17, 2021 6:56 pm

Had a go at drawing a basic circuit map thinking about the resistor and the switch needed for pin 10, what do you think of this?

I am assuming as the drive selector pin has a switched there is no need for a switch for the power.

Prior to powering up the ST I can select either to boot from the internal floppy as an A drive or an internal Gotek as an A drive.

I will think about where I would like the gotek screen and buttons once this works :)

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Re: Internal drive select

Post by exxos » Sun Jan 17, 2021 7:00 pm

Looks like its ok..
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friijy2001
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Re: Internal drive select

Post by friijy2001 » Sun Jan 17, 2021 8:24 pm

I will order the parts and built it and report back as others may find this useful :)

DaveC
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Re: Internal drive select

Post by DaveC » Sun Jan 17, 2021 8:40 pm

Shouldn't the pull up resistors connect to 5V?

friijy2001
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Re: Internal drive select

Post by friijy2001 » Sun Jan 17, 2021 9:16 pm

Ahh right so the switch goes from pin 10 on the ST to pin 10 of the drive and then there is a Connection on the Drive side (before connecting to the drive), of pin 10 that has the pull up resistor connecting it to the 5vdc of the power pin 1?

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