Floppy write protected (when its not) fix.

https://www.youtube.com/user/exxosuk · Post by **exxos** » Thu Dec 06, 2018 6:10 pm

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The issue was with a STE machine, which was continuously or intermittently reporting the floppy was write protected when it was not.

The assumptions are the drive has been tested and working fine in another machine. It is also assumed that the WP pin on the 1772 is always high (for write enabled operations).

The fix for this issue to solder a 10K bussed resistor array to the 1772 databus pins as illustrated below.

The white wire connects the common pin on the resistor array to 5V.

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Post by **terriblefire** » Mon Dec 31, 2018 5:56 pm

Just made this mod to my STFM

Hasn’t helped my issue but was easy to do

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Post by **PhilC** » Sun Jan 20, 2019 1:09 pm

Just checking, as I dont have any 10k, do you think it will work with 4.7k?

https://www.youtube.com/user/exxosuk · Post by **exxos** » Sun Jan 20, 2019 1:16 pm

Forgottenmyname wrote: ↑
Sun Jan 20, 2019 1:09 pm
Just checking, as I dont have any 10k, do you think it will work with 4.7k?

Assume would be ok..

DoG · Post by **DoG** » Sat Apr 06, 2019 2:28 pm

Did this on a STfm (070789-001 RevD) since I fitted 2.2 booster on it and having problem reading disks. Works perfectly now.

EDIT: v2.3 booster

https://www.youtube.com/user/exxosuk · Post by **exxos** » Sat Apr 06, 2019 2:30 pm

DoG wrote: ↑
Sat Apr 06, 2019 2:28 pm
Did this on a STfm (070789-001 RevD) since I fitted 2.2 booster on it and having problem reading disks. Works perfectly now.

Thanks for letting us know

tzok · Post by **tzok** » Fri Jul 31, 2020 10:10 am

This fix solved my issue with ACSI CF adapter in 1040 STfm. Before, it was writing complete garbage on the CF card, after applying this fix - works like a charm!

P.S.
Thanks to tOri from atari.org.pl, I probably have a fully working ACSI to CF adapter for ST. And it is fast - 1.8 MB/s on stock ST.

Floppy write protected (when its not) fix.

Floppy write protected (when its not) fix.

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Re: Floppy write protected (when its not) fix.

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