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currently im try to repair two 2MB autoinject sonys, cause the newer manual-inject stolen of my powermacs doesnt works well without dashing the floppy for inject  :ii: i have issues cause the upper head is have not the right force on the surface,  also one drive have a broken tiny...

i like the wiki idea  :-) Looks like the Ejectsignal on Pin9 is intended to use in a external Unidisk Chassis (with a Button wired to the Ejectpin), that was included in later Version of the Sony 800k Drive and FDHD. The "macintosh software" Eject seems to be hardwired into the FDD-Controller...

is it possible that the corrosion hidden inside the traces add some nasty parasitic capacitance and other AC-noise  to the DC voltage on the digital signals or powerrails? especially the floppydrive and controller seems to be very sensitive to this at my repair-experience of my Mac LC with a...

Maybe this can help you?   Explanation of the Power logic generally: https://www.downtowndougbrown.com/2015/03/explanation-of-the-macintosh-iiiix-power-onoff-circuit/ Somewhere i should have a copy of the PSU schematics too, if you need this?

micron produced actually 1Mx4 DRAM ICs without JEDEC testmode implemented. like mt4c4005 and "newer" produced DRAM also dont have the jedec testmode in the datasheet also found a detail description about the  difference in the datasheet, maybe it help

even apple doc say "remove screw if one present", are they even new shipped without?

maybe the seller dont know how fragile old plastic is, looks like even the only screw on the LC missing too :(

The IIcx (and SE30 too?) looks very similiar to the IIx schematics and have an PAL which control the Bank A/B RW-Line. Maybe its possible to modify the IIx with an custom logicarray to do the same.

(relevant information from Apple Developer Technical Support April 1992 Document) 4 Mbit DRAMs in Revolt When the Macintosh II was originally designed, Apple engineers intended for it to accept large amounts of memory in the form of 4 MB and 16 MB DRAM SIMMs. That was in 1986, when 1 Mbit...

im still try to figure out what exactly those special PAL memory do, i found only this information: also i figured out my IIx does not work with 1MB SIMM with three ICs (2x 1Mx4 + 1x 1Mx1 for Parity) Only with eight/nine (e.g. 1Mx1 DRAM)

have a Quantum GO16S021 Rev 02-H (with apple firmware from 1992?) in my powerbook 165 which worked some time ago sometimes and now is completely death (not even attempt to spin up). after read out the rom (socketed PLCC) its just garbage. maybe anyone can help me with a romdump? the sticker...

I got a Powerbook 165 but without power supply :'( I tried 9V 1A and it works little bit, but its not reliable (floppy access goes into a reboot). Have anyone tried a 12V (2A) power supply?

I got a Powerbook 520 with 4MB Memorycard, but 8MB Memory is not enough for me :p I attached pictures from the card, has anybody a clue what memory and what resistor i must solder?

My Quadra 840av dont boot from any SCSI-Devices at boot. When i boot the Mac OS 7.5 floppy, the apple drive setup tool say that the harddisk doesnt contain any valid partitions, and it cant format it. :'( I test it on the internal and external SCSI-Bus, with ZIP100 and my 2Gb Harddisk from...