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I'm mostly a hardware guy, I don't think I'll be able to modify the rom at all (assembly language is chinese for me) :( I'd rather give up on this project (unless one day someone on this forum who has already succeed in upgrading his 512k mac to 1024k or more without using 128k roms gives me...

I'm shooting my hair in trying to boot my mac plus from scsi2sd. I googled around and found that nobody had success :( I tried with many versions of HD SC setup, even the 1.4 from the system 2.0.1 disk... The disk is on the desktop ok but you have to boot from floppy or another boot disk :(...

To be honest, I haven't already bought the 16 256kb ram chips, I wanted to test the circuitry before. I even tried to ground the A0 input of the LS138 in order to inhibit the (not installed) additional ram chips, this way it should work like a stock 512k but all I got was a scrambled startup...

I couldn't find any more detailled instructions on google (I spend many hours searching)... I also think it doesn't work since the only chip added is a 74LS138 in order to manage 2 more columns (CAS). In all the third party upgrade I saw (in photo) there is much more chips added! Yes but I want...

I confirm, I use a 512k motherboard with 64k roms in a plus case and a 800k internal drive, it boots 400k MFS (and even 800k MFS) without any problem ;) The sound the drive makes is just different (lower pitch) than with 128k roms or HD20 init installed

I want to upgrade the memory of my 512k mac but all the snap-on card I know about are 128k rom aware only... I saw a tutorial on this site http://home.earthlink.net/~gamba2/images/plus_analog.PDF, I did it but noway, it doesn't work :( Does anyone know a way to address more memory (1024k...

Maybe the SCSI2SD doesn't meet exactely the real old HD specs... As anyone asked the developpers to find a solution? A trick to get around the problem (with system 6 only) is to boot from a floppy, then double click the finder file from the HD with command & option key pressed. Then, until...

Yes I experienced this recently, one of my 3.5" drive on my amiga rejected my discs, it was the 800k/1.4M microswitch!!! I cleaned it and everything is fine now.

I use "Snooper 2.0" 70ns is fast enough for sure ;)

Yes you can use SCSI2SD and Floppy emu at the same time! For HD image, yes you can use any size up to 1Go and maybe more ;)

Here it is: http://tjjq.free.fr/mac/Driverd2.hqx

There are only a few disk drivers able to make HD bootable on the plus... I think older "HD SC setup" as in system 6 install disks can, but the 7.3.5 can't! Sadly it's the only one to have been patched :( Maybe it is still possible to patch older versions to work with non apple drives? On...

Hi, the quadra usually suffers from leaking smd caps as many other macs of this era... But it's not always so bad as the motherboard is vertical and that prevents damage a little bit... In mine I replaced the capacitors only recently (8 month ago or so) and everything is fine! For the pram...

Even if it seems technically possible to have an ethernet card on the PDS slot, It might be quite hard to design one since it never existed! Another approach should be to use the modem port, even if it may be harder or impossible, i'd be very nice as it'd leave the PDS free sor something else as...

When I replace through-hole capacitors, I use an unusual but efficient method... I cut the capacitor in halves, and remove everything but the legs and then solder the new one directly on the remaining legs ,-) For Axials, it's even easier, no need to cut the capacitor itself!

Yes he replaced the reflective layer of the lcd by something like "oled" sheet he had to cut to the right size, the kit comes with an inverter you have to place inside the screen case. As far as I remember it was blue backlight but maybe white is also available? Another drawback is that you...

If the putting the jumper in the right position doesn't help maybe one of your 1Mb simm is bad... Temporarily you can still combine two working ones with two 256kb simms for a whole 2.5meg of ram

What happens if you put your 256k simms back in place?

Beware of the caps in the DUO too!!! I wanted to resurect my 210 this evening since it didn't want to boot at all for several years... After opening it up, i could see on the top left corner of the logic board, many smd leaking caps (5 or 6 and mostly bigger than in desktop macs), I replaced...

This interpellated me quite a bit so I dug up my own 2300c to try this... without success! In the monitor controp panel, or in the tool bar, the only resolution available is 640*480 :(