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An unrelated but interesting take away from this discussion is that sometime during the production lifespan of the first Quadras, Apple changed the numbering scheme of their custom ASICs to the "343S" system, and there are differently numbered but identical ASICs out there from this time period...

Lol, no I missed that!

Related: The DAFB (framebuffer controller) on my Quadra 700 has a different part number so I dismissed it, but I found this image which clearly has a 343S0128-01 populated in the DAFB, which lends credence to the notion that this is a duplication of the Q700 video subsystem... I can't identify...

No apologies required, I perfectly understood your concerns! As I hinted at previously ("borrowed" ASICs), I strongly suspect this board is simply a duplicate of, or based on, the video subsystem of some existing 040 mac, hence the use of Apple branded ASICs. From a brief glance U1...

Awesome! That is one very rare card you have there, I wonder how many were made?

I think the colours are very close, I know mine looks darker/glossier in my photo, but it's pretty dark in here as I took the photo, and it's quite a dull/matte green in reality. I'm not dismissing what you're saying, but I think the similarities are too much to be coincidental. I do have a...

Well, yes, they are very definitely extremely different cards! But the similarities are significant IMO. More than just the VRAM, resistor packs are all BI on both boards, whatever that little PLCC20 chip is has the same type of sticker on both boards, same kind of smaller bar code sticker, A7...

Although there's no matching shipped product that I know of, that card looks very rasterops-y. I have a Paintboard Lightning and there some very obvious design similarities. PCB is the same shade. Silkscreen font looks the same. Many of the components are from the same manufacturer. Some of the...

Ideally (IMO) you should use a combination of both - your current loopback cable has both TxD/RxD - and + connected which is technically correct, and then just HSKi to HSKo. Grounds should not be connected to anything for a short loopback cable. As an aside, I am quite unimpressed with Apple's...

Yeah they should definitely not be grounded. Otherwise, OP's loopback cable is differential. Is this an original cable or one that you've made? Branchus' reverse engineered cable that he posted over on TD was single ended (RxD/TxD- only and handshake, also I admit that I did not read the rest of...

Good to know! I'm kind of surprised, given that the macs serial ports are rs422 and most of Apple's serial peripherals are rs422, that Snooper's loopback test cables are wired for rs232 operation...

I assume a standard mac 8 pin mini-din serial cable will have all lines connected at both ends, but whether Kermit or any other terminal program on the mac can be made to actually use RS422 I just don't know. I'd be more interested in learning what your other printers use. If it can be...

Oops, I missed that! I looked at Branchus' snooper loopback pinout and it is specifically testing TxD/RxD- and handshake lines. TxD/RxD+ are not connected. That is probably a non-issue as those are the two that would normally be connected when hooked up to an RS232 device (which the IW at least...

I have some thoughts on this, that may be something or nothing. The old mac serial ports are RS422, which is a four cable differential serial connection. However, there are three additional lines in apple's implementation, two for some kind of handshaking and clock sync, and one that is called...

Yeah I saw your post on TD, seems like you have some more serious issues with that drive, corrupted partition map or something...

Long time since I've messed around with restoring images on old osx, but restoring from a disk image will I think overwrite/modify the partition map to match the size of the image, not the partition you are restoring to.* So, I am presuming that the Sorbet image is 10GB? And that if you...

I've never seen these symptoms on a vintage Mac so I can't say categorically, but on modern gpus that kind of artefacting is common and pretty much guaranteed to be a vram fault, usually caused by a sdram ic overheating, being overclocked too far, or simply dying. The reason I suggested trying...

I'm thinking that almost has to be vram or ramdac right? Does changing the bit depth to something lower make the problem go away?

Not at home to check anything just now, but I use a SCSI2SD v6 on my Q800, which as you probably know is the same logic board as the Q650. Replying to remind myself to look when I get home! What I can tell you from memory is that I specifically recall also not being able to boot with SCSI...

I don't know what U46 does on the 610, it's a simple logic gate ic, it should be fairly trivial to see what it's connected to and figure out it's function. I don't have a 610 unfortunately. The scsi controller is the 53C96. IOSB is a multipurpose IO controller. A faulty IOSB could potentially...