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The Tandy 1100 floppy fix

T

TandyisDandy

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Joined
Mar 29, 2010
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Has anyone ever tried the famous Ivan Baggett fix for using a modern floppy? It says that pins 1,2,4 and 5 on the CN401 should connect to +5 but where does the +5 connect on the standard floppy end? Where is that +5 going?

And what about the power connector itself? A modern floppy's power connector has four pins but the stock tandy floppy only has 2.

Anybody actually try this set up?
 
I don't know. I also don't understanding how the +5 is connected to anything on the floppy. The table shows +5 from the tandy power connector designed for a floppy goes to several pins on the flat flex connector through the CN401 but then what does that do? It doesn't say to hook any of that up to the kludged modern floppy cable. If the original 2 pin floppy power is going to be hooked directly up to the new floppy power (and that's an assumption, but a reasonable one) and just ignore what would normally be the +12 pin on the new floppy , what's the point of original pins 1, 2, 4, and 5from the flat flex going to the 5 volt hot and not to the floppy? Is that feeding something back down to the motherboard or what? So... I've got the parts, but I don't want to start the project until I know where I'm going. Of course, I could also have it all wrong.
 
Unknown_K said:
On the standard floppy are all 4 pins in the power connector needed?
Click to expand...

On most 3.5" floppies of recent (meaning since about 1988) manufacture, only the +5 supply line is used. Most 5.25" floppies use +12 and +5; 8" drives commonly use +24, +5 and +12 (and sometimes -5) as well as AC line voltage for the motor (there are 8" drives with DC motors, but they're less common).

I wonder if your 1100 FD doesn't use the standard 26-conductor Teac FD-05 pinout (which includes power).
 
Chuck(G) said:
On most 3.5" floppies of recent (meaning since about 1988) manufacture, only the +5 supply line is used. Most 5.25" floppies use +12 and +5; 8" drives commonly use +24, +5 and +12 (and sometimes -5) as well as AC line voltage for the motor (there are 8" drives with DC motors, but they're less common).

I wonder if your 1100 FD doesn't use the standard 26-conductor Teac FD-05 pinout (which includes power).
Click to expand...

No it is 24 pins and is in the flexible flat cable form.
 
There's a pin out in the project pdf. The path of that +5 just doesn't make sense to poor old me. Bearing in mind I haven't done a lot of this kind of work since the days when that computer was new. :)
 
There's an awful lot of people who have posted in various forums about this fix over the years, nobody has actually tried it?
 
I will pay $20 for this adapter in working condition that allows you to put in an off the shelf floppy in a tandy 1100fd. I'm beginning to think it is more myth.
 
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