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You can use the official service manual - https://tim.id.au/laptops/apple/legacy/classic_ii.performa_200.pdf Specifically you would want the procedure at PDF Page #107, or Page 18 of the Adjustments section.

Yes, the ROM slot is between the modem and RAM slots. The card has an 8 wire cable coming off for power and signaling to the backlight inverter. Yes, although the computer usually needs a keypress to power it on, so you may need to connect the keyboard if you want to test it past the powered...

Is this the M5120 with the backlight addition, or the M5126? Only the M5126 had a backlight, though you could get a backlit display with accompanying ROM card to add a backlight to M5120 The system will not function properly without power via the battery connector, due to both the current...

After that last revision, I've made some more changes and order up the next batch of boards. Once they eventually arrive from overseas and they're tested good, I should have a lot more available. As for the finished design, I think it's nearly there...

Interesting. I'll have to try that with one of mine. I'll admit, I've never actually tested either of mine because I wasn't sure if they were any good, so I just tossed them aside with the original Portable batteries.

It might actually just be a test pad rather than a via. I fiddled with mine a bit, and it seems more like a flat disc that just lifts right off the board.

I can't see anything missing from the schematic though. You have: R37 - Feedback Resistor R36 - Isolation Resistor C56 and C50 - Load Capacitors U7-3 and U7-4 - Out and In Y1 - Crystal Typically that's all you need to use a crystal like this.

The M5120 is similar to the M5126, but differs slightly. So if you end up buying a kit for the M5120 for you would be missing the 4.7uF capacitor and would have some extras of other values. I'm sure you've already found this list, but here are the capacitors for the M5126: SMD Electrolytic: 4x...

Right, it is likely connected from the blind via to the via you can see above R37. I don't see any reason why it would go anywhere else.

Sorry, I thought we were talking about the right side connection of C56. That one is a blind via, so it's hard to tell, but I'm guessing it goes to R37 since there doesn't seem to be anything else connecting it.

It definitely appears to go to ground on my board. It does not appear to be a blind via either. I can see the two vias below C56 match up with the two under Y1. The blind vias appear to be plated/plugged.

The A8 comes in both 12V and 5V, though I'd say the 5V is rarer/more difficult to buy accidentally.

Have you tried the SCSI Manager 4.3 system extension?

I'm out of parts and money at the moment, but let me see if I can get an order in sometime soon. I'll try and send a DM once I can get the parts.

I put a 470k resistor between battery voltage and the VREF, and now I get a stable 1.23V and ~5.2V no matter what I put the battery voltage at. Getting closer...

You still have it? On mine it looks like the 1.2V reference varies based on battery voltage, which definitely should not happen. I replaced it which gave it a small boost, but it's still not stable. Right now I'm looking at op-amp output A which I haven't traced out but I'm guessing is a...

Send me a DM with your shipping address, and I'll send one out soon.

I only have priority mail envelopes and boxes at the moment, but I'll put you down for one and figure it out.

I'm looking for 3 US based people (I'd like to do international, but I don't have the money for it at the moment) who need a replacement hybrid for their M5120 Portable. I've been sitting on this design since the beginning of the year and I've just now decided to actually do something with it...

I finally got it booting. I got frustrated and removed most of the RAM and logic ICs, cleaned, soldered, reflowed, and then reflowed again. Now it seems to work fine. Except... Now I have a strange issue with the 5V. I have to bring the battery voltage up to around 7.1V to get a stable 5V...