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Okay, thanks. But could be a mis-aligned Track Zero sensor be the cause for not writing at all? I would assume if the sensor is mis-aligned wont read at all. Mine does read without problems. If I interpret https://tinkerdifferent.com/threads/superdrive-floppy-maintenance.549/post-5984 correct a...

Do you mean the photoelectric barrier next to the floppy cable connector? I didnt clean it after the write errors. I'm sure I cleaned it initially. I'll check.

Another part in my SE30 journey. I assembled the machine and tested it. A few days ago I cleaned/lubed the floppy drive, a Sony MP-F75W, as per https:// www.youtube.com/watch?v=2LWfjsvc8OA. In the assembled machine the drive worked at first. I could read data and write data, initialize disks...

I connected an Molex Y-cable to the HDD power cable. From there I connected an Molex to 2*SATA power adapter and connected two old SATA notebook drives. Both do spin up and I measure 5.10V on the 5V line now. The voltage is stable for ten minutes now. I think it is safe to connect the...

Thanks. I'll have a look if I can hack something together. I dont want to connect the precious SE30 motherboard till the voltage situation is okay. Maybe it is already ok, but I want to be sure not to fry the board.

That is what I did and the voltages I took from there.

I'm in the process of re-assembling my new SE30. I recapped the analog board an and did an initial smoke test. An old HDD did spin up, so I think I didn´t screw up the analog board while recapping. I did not touch anything inside the PSU at the moment. I checked the voltages with nothing...

To bring this thread to an end I came to the idea to use two "Phone Net" adapters to reach the goal. It should be equivalent to use an serial cable. But the moment I was to bid for a pair of Phone Net adapters I saw an printer/serial cable for sale. So I bought this. :-)

Sorry, I forgot to add that I'm located in Europe, so my order options are somewhat limited when taking customs and shipping costs into account. My intention of this post was that there is maybe such a cable used for a different machine/product which can be repurposed as a serial cable for...

When things work out the way I hope I soon will have an second compact Mac, an SE30 in good working order. I want to equip this machine with an BlueSCSI and want to use it as some sort of bridge machine for my other compact Mac. I learned that a simple Mini DIN can be used build a machine to...

To finish this thread I can happily report that the machine is running fine with the mixed RAM modules. I ran Snooper RAM test in a loop for a while now and it seems fine.

Removing the jumper is what I did. Thanks for the link to the memory guide. The guide notes to put the memory modules in slot 3/4 for a 2mb config. I found it out trial an error. Then it states for a 2,5mb config to put the higher density modules (aka the 1mb ones) in slot 1/2. The table tells...

I fiddled around with the RAM modules out of pure interest. Two modules in Slot 1 and 2 and I have a sad Mac. The same modules in Slot 3 and 4 and the machine starts. Then I mixed modules which I normally wont do. Two Siemens modules in Slot 1 and 2, and two Samsung ones in 3 and 4, the machine...

I did this unfortunately without any effect.

I found SE schematics at https://archive.org/download/Macintosh68kSchematics but they are barely readable. Are there any better ones somewhere? Arent all adress lines used when only half the capacity is set? Also the second line changes every time I power the machine up. This leads me to believe...

Hello there, I'm new to the classic Mac world and bought me an SE FDHD recently. Unfortunately this was battery bombed and probably beyond repair. I got me a replacement motherboard which once was an original Apple repair part. The board does look ununsed. I installed 4 identical 1MB SIMM...