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The silkscreen marking indicates that it's a resistor, with a value of 390ohms. Get a multimeter and measure the resistance across it when powered off. If the reading doesn't tally with the rating, replace it. It might be shorted, but equally something it's connected to is shorted and that...

Time to batten down the hatches, lads, it's gonna get scary! O.o

Just a quick note that EDO is iirc a superset/extension of FPM - and you can make an EDO SIMM work as an FPM by tying /OE to /CAS, iirc - @Zane Kaminski had more information on this, though: https://tinkerdifferent.com/threads/5v-fpm-dimms.136/post-1190

What differentiates the Macintosh SE from the rest of it's forebears? Well, the fact that the PAL's of the earlier 128K, 512K & Plus machines have gone away and been replaced by a single custom ASIC. The original Macintosh was designed around a single ASIC called the IBM or 'Integrated Burrell...

Digitised copy of the VTI/VLSI Gate Array Design Manual from 1986, including gate layout schematics.

For the SE. The GLU on the SE is a combination of logic elements into a single chip because they didnt have the space to use discrete logic. In the Classic, they used discrete for the remaining functionality as they'd removed the dual floppies so half the functionality wasn't needed. GLUE is...

@craig the one you found was the one that Porchy did - i did the initial bits that got 90% the way there, but porchy figured out the mad .OE portion of the HAL that made no sense. The discrete version...i'll actually have to dig out my personal macbook pro, see if the project files are still on it 😛

I'm actually jealous of that space - used, but yet....still not untidy!

If you're trying to harvest the GLU, don't worry - Porchy reverse engineered it - you can burn the .jed available to an ATF16V8 instead. I also worked out a discrete logic version using 74LVC125's :)

I'm happy to place an order for them as I did with the Tyco 64-pin SIMM sockets? @torbar might be willing to be an intermediary again!

This may come in handy: https://www.tindie.com/products/glitchwrks/gw-1286-1-dallas-ds1286-maintainable-repair-board/

"SOON..."

Yes, i damn well need those - trying to get the firmware flashed on my G4 with Leopard is a pain - without repartitioning and reformatting everything...!

Luckily, the ADB chip that was removed, can be sourced from UTSource! They *are* about $12-14 each though, but they're new old stock. I'd definitely recommend investing in a hot air station - a Yihua one can be purchased for less than $100 off Amazon, I use one, they're not bad as starter gear :)

While you may know that Power Macintosh G3 & G4 machines came with ZIP drives installed (as a CTO option), you can use any other ATAPI 3.5" device in that bay - it doesn't have to be a ZIP drive. In this instance, i'm going to install a Fujitsu MCE3130AP 1.3GB ATAPI Magneto Optical drive in it...

Okay - these yellow things at the back of the board, are the R/C Networks. Test the pins opposite each other, from top to bottom - ignoring the corner pins. You can see where the traces run to the serial ports, check you have continuity ACROSS the R/C network and also check if the pin at the...

well other than the corner pins, everything is a straight through connection from one side to the other - you should get continuity across the network.

Check continuity of the R/C network? :)