That's likely. Apple probably got a different manufacturer to create the slimmer drive needed in the laptop. I noticed that the drive in the Quadra 605 (with dust flap and differen…

Dog Cow, there is no way the UniDisk will work on a Mac with it's "smart" circuitry intact. It's the equivalent of hooking an electrically compatible Disk II. As for the Lombard P…

Just to be clear on these points: The 800K 3.5" drive for Apple II (UniDisk) is identical to the drive mechanism used in the Macintosh. The only difference is that the Apple II ver…

Well good news and bad news. I decided to take a look at the Developer Note for the LCIII and it states this. The Macintosh LC III uses a new floppy disk controller circuit,…

There is the early 800K 3.5" drive for the Apple II which has its own 6502, buffer RAM, and IWM chip inside and which talks to the host like a HD20. There is the 400K Sony drive in…

I wonder if I still have that. Click to expand... While searching for it, please also remember to keep an eye out for your MacDraw schematics.

Just to make things interesting, Apple has a bunch of different floppy drives with different software interfaces which all plug into the floppy port / IWM / SWIM / IBM chips. There…

Well about the time I pulled out the soldering iron I realized something. If I want to understand how the drive works it would be much better to spy on it while the Mac is using it…

I did some research and found that the SWIM and pretty close to the IWM. I took a look at the Linux Mac floppy driver code and apparently a command is sent to the drive it switch i…

If anyone has a link to a document chronicling the secret recipe for speaking to an HD-20 it might be an apropos time to trot it out. Click to expand... We've been begging for…

Anders, That's a very generous offer - and I may very well take you up on it. I'll see about buying the caps off Trag first though. It's be nice to get my SE/30's going again - e…

Dude you just hit it out of the freaking park. That is the most concise explanation of the 400/800KB drive I have read. Even the biography is an excellent source of information. …

Anders, That's a very generous offer - and I may very well take you up on it. I'll see about buying the caps off Trag first though. It's be nice to get my SE/30's going again - e…

I've bought mine off Trag (Jeff) here on 68kmla. Prompt shipping, and a fair price (15us$ I think). I live in Denmark, and I'd like to volunteer my labour to a fellow enthusiast. …

I have a pair of SE/30's, from the serial numbers one is Irish and the other is American, and I'd like to replace the capacitors on both. One did work occasionally, but now only s…

...Just one more thing to note... it looks like the Mac floppy drive *isn't* a completely dumb device. Look in your copy of "Inside Macintosh", the hardware section, and read the b…

My Arduino board arrived so I can start experimenting with the Microcontroller. I also share the concern that the memory is too small, but well just have to see what happens. My n…

If you are going to emulate the 400K drive itself, it is completely dumb. The IWM in a first generation Mac is exactly the same as the IWM in an Apple //c or an Apple II non-integ…

If you don't mind risking such a machine...your best bet would be a Mac II. Otherwise, you could gut an external Apple 3.5" drive for the adaptor board and connect it to an IWM-equ…

Wow guys lots of great information here. This exactly what I hoped would happen. Development work has stalled as I expected because of the Thanksgiving holiday here in the US. I …

Larry Pina has a very clear procedure for doing this in his book Mac Classic & SE Repair and Upgrade Secrets. It was a very common upgrade at the time. Books can be found r…

It may be best to see if you can find somewhere to mount a standard computer fan and find one to suit. Click to expand... Larry Pina has a very clear procedure for doing this i…

Jameco, mouser, digikey would probably have them

That's called a squirrel cage fan. It's more common in industrial and automotive applications, and, as you have surmised, is not a common or readily available computer part. It m…

get a metric ruler, go from there, its one of 3-5 sizes Click to expand... It is approx. 70mm tall with a power lead running nearly the length of the analog board. From your p…