Recent content by nyef

The "washed out green" effect specifically (not necessarily the phase being out of whack) is because Mac cards produce a "Sync on Green" signal, where sync signals are transmitted on the green color channel either instead of or in addition to any separate sync channels, and quite a few systems...

From my own notes last February (and, no, I haven't actually finished rebuilding the thing, it's sitting, shelled, on my workbench): I'd be glad to know if I'm wrong about this, and if anyone has advice on recovering (even if it's "replace the ICs on the BMS") if it is locked out.

A bit more digging suggests https://wiki.preterhuman.net/PT_9_-_A/UX_System_Calls_From_Macintosh_Software as another possibility.

Is it this you're looking for?

You'd be surprised at how much damage can be repaired sometimes. The worst that this is likely to need is a bodge wire when all is said and done. Clean up the flux residue and whatnot with good, strong isopropanol (isopropyl alcohol, or IPA; typically 99% strength is used in electronics work)...

Ah, yes. Sorry, I was focusing more on the pads themselves (which I found to be necessary when I tore both pads to a leaked surface electrolytic). There's probably enough integrity on the remaining pads that you could just solder in a new chip and then wire directly to the chip pins. In any...

Conductive epoxy, and a bit of copper tape to replace the outright missing pads. Specifically, epoxy down the partly lifted pads, and epoxy pad-sized bits of copper tape (adhesive side up, since the adhesive on copper tape degrades trivially with heat or IPA) to replace missing pads. Once the...

Honestly, I just counted the arrangement of pins in the image, went to Mouser, went to "board-to-board and mezzanine connectors", punched in a search for 300-pin connectors, and that was the datasheet for the first product in the list.

It's not one of these, is it? https://cdn.amphenol-cs.com/media/wysiwyg/files/documentation/datasheet/mezzanine/mezz_megarray.pdf

This analysis (from some of my own notes on ROM resources) may be of help if you're inclined to write a new extractor: - Starting with the 512k ROMs (Classic, Classic II, LC, LCII, IIci, IIsi, IIfx), there is still an offset at offset $1a, but the format of the...

That feels like it might be something screwy with long-lived connections in the TCP stack, given that it's protocol-agnostic, location-agnostic, and specific to OS 9. If it were me, my next angle of attack would probably to figure out how to capture a packet trace, filtering out the bulk of the...

I'd consider using a flux-imaging system such as the Greaseweazle, but getting from a flux image to something that can run on an emulator can be a bit of a task. Also, it's more hardware and software to faff about with.

I'm honestly expecting a parallel data interface of up to 8 bits (not all of which might be used on a grayscale system), a dot clock (possibly sampling the parallel data on both rising and falling edges), a blanking or row/column start signal or two, and some signals for running the backlight...

If you just want to see if it boots, you can "jump start" it. Ground the negative side of a 1/2 AA cell and use a bit of wire to briefly connect the positive to the startup pin on the PSU connector.

https://web.archive.org/web/20040721025715/developer.apple.com/documentation/Hardware/Developer_Notes/Macintosh_CPUs-68K_Portable/PowerBook_190.pdf might be more to your taste.