Floppy Drive doesn't do both formats, but does sometimes

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exxos
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Re: Floppy Drive doesn't do both formats, but does sometimes

Post by exxos »

Thanks @stephen_usher I assume its a proper setup where the MOSFET only switches low each side, so it should not affect the high-voltage.
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Re: Floppy Drive doesn't do both formats, but does sometimes

Post by Cosmic Puppet »

Thanks for doing this!

So, just to reiterate. UltraSatan is fine if plugged in and switched on. The problems only occur (for me at least if plugged in and not powered on)

It took me a while to realise this. So you can for instance just have it switched on with no cards in it in order to format using TOS 1.04 and have no weird issues. Like people say though there might be motherboards that have different behaviour. It's almost like Ataris have souls. :lol:
US Atari 520 STFM (C070523-001 REV.D1) , Exxos PSU, 4MB Marpet Upgrade, Exxos 6 Chip TOS 1.04 USA, EmuTOS 20211020, Ultrasatan, PP Driver, Original Floppy Disk Drive, NEC Multisync EA193Mi Monitor, Star LC-10c Printer, iMP C100110-001 DMA.
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Re: Floppy Drive doesn't do both formats, but does sometimes

Post by exxos »

I wonder if that MOSFET level converter grounds everything when not powered up...
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Re: Floppy Drive doesn't do both formats, but does sometimes

Post by exxos »

exxos wrote: Fri Apr 23, 2021 3:17 pm I wonder if that MOSFET level converter grounds everything when not powered up...
Actually I don't think it could do that, as on the STE which has buffers, it would blow up the MOSFETs..

Maybe someone can test the databus out to ultrasatan on and off and see what actually happens...

In any case such problems were solved on the H5.. As both floppy and DMA are buffered and isolated from each other, so one just simply cannot affect the other.
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
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People should find solutions to problems, not find problems with solutions.
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