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That makes sense, thank you everybody!(y) I Thought It was possible cause I read this PDF file, at page 28 it states that it is possible to upgrade a Mac 512k to 1 meg with nothing else than DRAM chips, a 74LS138 and some passive components... The guy doesn't seem to have tested it by himself...

Ok so this implies that every third party memory expansion available for the Mac 512k at the time needed a Mac Plus ROM upgrade, I'm right?

Hi, I'm actually fiddeling with a spare Mac Plus logicboard I have. Sadly I don't have the original ROMs for this board. I also own a rominator board so I decided to use it. After burning the appropriate rom files (Hi & Lo) it works well. I then thought of an improvement : I always wanted to...

It might be cache issues but 32 bits addressing seems more likely. Sadly AV macs can't do 24 bits addressing... That's why I don't use my 840AV as my "daily" mac, I use an accelerated (33Mhz 68040) LC 475 instead.

Hi, I thought of a different way to make the ideal init (for me) but except old Basic computers and Casio calculators my programming skills are close to absolute zero :( see here

Hi, since battery leakage is a real problem in old macs I thought about an extension which could restore the PRAM (and xPRAM for macs that have it) at startup. Yes "Pram auto restore" already does that but you still have to reboot once manually in order to validate certains changes... (32 bits...

Hi, I've been using PRAM auto restore for a while now, it's a great utility to avoid keeping a battery inside my macs! The only drawback is that I have to reboot once manually every time I want to use my mac since 32 bits addressing, mouse speed and other things need to be set before system...

Hi can’t tell specifically for SCSI2SD but I had encountered this issue many times in the past with real Hard disks!! Forced to boot from a floppy to make my HD bootable again...

SCSI (50 pin) slot loading drive... hard to find to my mind!

Yes that's true but it'll be hard to fit inside...

I've heard Duos logicboards are timebombs... If one powers it with leaking caps inside -> little hope to make it work again even after recapping! I have a 210 I racapped years ago but... too late (it boots to the gray screen... when it boots!).

More seriously, You could try rubbing alcohol, I use it on dirty macs it doesn't harm, but never use acetone!! It melts plastics!!

Better paint the whole thing in yellow!! [:D]

A real day dreamer this seller... Maybe the trackpad is gold plated and the keyboard set with diamonds?  [:D] https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.fr%2Fulk%2Fitm%2F184117474312 Some people really have time to loose...

Ok thanks, I thought the pinout could be different... I'll try on aliexpress  ;-)

I can easily find the MMBT3906 and MMBT3904 but the PC74HC132T is quite expensive and I need two of them... Do anyone know a equivalent component?

Be careful and require motherboard pics!! A lot of them died cause of Maxell battery exploding inside...  :-(  and if it's the case, you lose $100!

Had exactely the same problem since I got my IIfx 5 years ago... The first thing I made when I got it was recapping but the problem was still there! This WE I went on the problem to see if there was any broken trace with the power circuit and RTC schematics... but everything was fine... In...

The electrolytic caps inside the PSU don't necessarily need to be replaced but the "X" and "Y" filtering caps can safely be removed... they often explode inside!

When you short pin 9 and 10 you should hear a "click click" sound. It's the relay inside the PSU which toggles power to the secondary AC outlet. The reason why it's clicking is because the PSU isn't "loaded" and safety circuit prevent it from starting for good. On the other hand, if you don't...