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It will only switch once, so a meter would be fine for checking it if you can get a safe connection. There will be a test point I'd suspect. I'll see if I can find what it is for you... (I'll edit it in if I find it, if I don't, assume I couldn't or got distracted by a passing bee).

I broke out the thermal camera and it looks like the head driver IC is getting warmer than I would expect. Not super hot... but it heats up instantly and it doesn't in older models I have (although it is a different part). My next step would be to try swapping it out, but I don't have another...

Nah, you don't need the mounting point. Without the huge adapter you'll be putting less strain on the connector than the stock design which was mostly ok with just the solder mountings. Keep it small, keep it cheap. Ok, but just to warn you, that isn't what logic means in electronics, or IC...

Ah, no, you don't need anything other than some traces and a single diode to adapt from PowerMac video to VGA. The adapters with switches are only needed for older macs, and even they just have like, two diodes in them, unless you're messing with sync and auto detection. Here is the required...

That's good, if the opening is flush with the board then it is even easier. I don't quite know what chips you're talking about though, isn't it just the HDI-45 connector going on between the board edge and the connector pins?

No need to drill holes in the case. An L-shaped bracket with two right angle triangles would provide plenty of support. You could make the whole thing out of PCB. As mentioned, there are four ground tabs already there for mechanical support (they're already used as such by the existing...

It would be easier to desolder the connector from the logic board and replaced it with an L-shaped bracket that presented a standard apple or VGA port on the back. Way easier to pick up the contacts on the logic board than at the connector end.

Page 282 onwards here might help : https://vintageapple.org/inside_o/pdf/Guide_to_Macintosh_Family_Hardware_2nd_Edition_1990.pdf#page=282 I suspect address lines A0 and A1 aren't connected because the ROM is 32bit and the addresses are in bytes? Or am I being daft? So basically, you don't need...

I wrote a little program that extracts styled text resources from a file (in this case application) converts mac encoded characters, changes formatting to html and spits out a file for each resource. I used this to export the 300+ pages of the in application manual for Control Lab and LOGO...

Ah sorry, just noticed the peripheral one has subcategories - I opened every top level in a new tab and missed that that one was one of those.

Same for me, and also this topic : https://tinkerdifferent.com/forums/add-ons-peripherals-networking.187/

Folks, have you had a look in the "Guide to Macintosh Hardware 2nd Edition" book? Its available online as a pdf. Specifically, there is an interesting bit from page 269 (pdf page 308 - linked here). This section gives some clues for some things to check for. This is a block diagram...

If you can find a Sonnet Tempo Serial ATA, that would work great - but they're expensive. Or something like a Firmtek / Seritek 1S2... but they rarely turn up. Until recently you could actually still get them new. They're basically the same card and both will boot Classic Mac OS from...

There isn't a ROM for the 3114 for Classic Mac OS (at least I don't know of one that allows booting and all four ports to work).

https://elephantandchicken.co.uk/stuffandnonsense/?p=2916 Documented some serial cable info if anyone is ever trying to get one running. Had fun today - I got a couple of angle sensors (I felt they were the only sensors that would be a bit too much effort to make my own). They work sort of...

Does anyone in the UK have one of these with the click of death that I could nab the controller board from if I can't fix this one? I haven't been back to it yet because of distractions, but given it doesn't have the most common failure mode, it might be the easiest way to save it.

Afternoon @robin-fo - Since making my post I've measured the two tin can electrolytics and tantalums and they're as expected in both capacitance and resistance. There is a low resistance over one tantalum, but the low resistance was the surrounding circuit and not the capacitor when I removed...

I bought a NOS Zip Drive on Facebook Market Place - one of the old shape ones that is translucent and USB (to match the early iMacs). I was pretty excited because it was still sealed and so were the provided 3 disks and the manual / drivers. It arrived a short while ago, I opened it and plugged...

You're entirely correct, I've just got muddled at some point in the past. Thank you for making me look. It is a pain to look because I have the DOS card installed and the resistors are under there. A DOS Compatibility setup for anyone interested : This poor machine has had a rough life. It...

Hum, and just to collect info in one place. Here is a few more ramblings about upgradability : The Performa 630 family have quite a lot of expansion slots. As well as an IDE (great for Compact Flash disks) hard disk and SCSI CD ROM bay (not always fitted from factory) they also have... Built...