Hi,
I purchased an external floppy for Atari ST a few months ago, it’s a no name containing a simple power circuit and a TEAC FD-235.
I tried it yesterdays it’s not working, Floppy LED turns on briefly at startup but after that the drive is not recognized.
I troubleshooted a bit this morning, the 7805 chip was dead giving 4.4V when powered with 5V and 5.5V when powered with 6V. I replaces it with a new one and now I get a steady 5V but still not working.
I wanted to replace the TEAC drive with one of my spare to try but no luck I tried with two different EPSON 380 and an Amiga 600 drive but still nothing.
I tested the cable and I have continuity on all wires and it seems to be properly wired.
I was wondering, as all my spare drives are originally internal ones, do I need to change DS0 to DS1?
External floppy settings
- olivier.jan
- Posts: 212
- Joined: Mon Jun 01, 2020 8:00 am
External floppy settings
Retro stuff
520 STF/ 1040 STE / Mega ST / 2 Mega STE / 2 H5
2 x 600XL with U1MB /SOFIA 2/ AVG CART / and a few 1050
Apple //c, Commodore 128, Mac Classic, SE/30, LC, IIvi and PB G3 (Clamshell)
Amiga 600 and a few 486 and 386.
Many Nintendo G&W and other electronic games from the late 70s/early 80s.
520 STF/ 1040 STE / Mega ST / 2 Mega STE / 2 H5
2 x 600XL with U1MB /SOFIA 2/ AVG CART / and a few 1050
Apple //c, Commodore 128, Mac Classic, SE/30, LC, IIvi and PB G3 (Clamshell)
Amiga 600 and a few 486 and 386.
Many Nintendo G&W and other electronic games from the late 70s/early 80s.
Re: External floppy settings
6V input sounds a bit low still. IIRC they need 2volts high minimum, but you would have to check the datasheet. 9V would probably be better.
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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.
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
- rubber_jonnie
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Re: External floppy settings
I use 9-12v with my external FDD, it has what sounds to be a similar 7805 circuit to mine.
And yes, it needs to be DS0.
And yes, it needs to be DS0.
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
- olivier.jan
- Posts: 212
- Joined: Mon Jun 01, 2020 8:00 am
Re: External floppy settings
Thanks guys, you were spot on, I was too shy with my 6V.
After using proper 9V the FDD works fine.
A new 7805 and proper voltage and I now have my first external floppy.
After using proper 9V the FDD works fine.
A new 7805 and proper voltage and I now have my first external floppy.
Retro stuff
520 STF/ 1040 STE / Mega ST / 2 Mega STE / 2 H5
2 x 600XL with U1MB /SOFIA 2/ AVG CART / and a few 1050
Apple //c, Commodore 128, Mac Classic, SE/30, LC, IIvi and PB G3 (Clamshell)
Amiga 600 and a few 486 and 386.
Many Nintendo G&W and other electronic games from the late 70s/early 80s.
520 STF/ 1040 STE / Mega ST / 2 Mega STE / 2 H5
2 x 600XL with U1MB /SOFIA 2/ AVG CART / and a few 1050
Apple //c, Commodore 128, Mac Classic, SE/30, LC, IIvi and PB G3 (Clamshell)
Amiga 600 and a few 486 and 386.
Many Nintendo G&W and other electronic games from the late 70s/early 80s.
- rubber_jonnie
- Site Admin
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- Joined: Thu Aug 17, 2017 7:40 pm
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- Contact:
Re: External floppy settings
Good stuffolivier.jan wrote: ↑Sun Oct 17, 2021 7:53 pm Thanks guys, you were spot on, I was too shy with my 6V.
After using proper 9V the FDD works fine.
A new 7805 and proper voltage and I now have my first external floppy.
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...