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That's a good point. The older chipset remains an issue, but nothing can be done about that. Those 3 models used soldered ROMs, so you would need to take a ROM image and write it to a programmable ROM SIMM.

I have one of these also. While it's not great - it's a webcam grafted to a microscope, after all - it is extremely adequate, and a heck of a lot better than fiddling with something by hand.

Just to be clear, the Rominator is an IIsi ROM image with some QoL modifications. It doesn't have any additional compatibility over the base image. It may happen to work in other machines, but that will be where the original IIsi ROM would also work. So it should be discarded for the sake of...

One thing to note is that the twinspark adapter is only really appropriate for DiimoCache cards, some other cards work but it is by happenstance rather than delibrate design. Seems like CPU's not dead as that isn't straight siasmimac or zebra stripes which indicate the CPU isn't running. You'd...

I just ran into the same with a chinese seller I had previously established as having a supply of 1J23S FPUs. New name, same listing number but contents all different... I'd agree that it seems likely those are remarked, but for a reloaded board any mask should work (so long as it's actually a...

I wouldn't DIY it, especially with the loose pin receptacles. I used two types of them on my socket carrera board and both were hellish and had issues even with tools to assist in alignment. I've never been overly concerned by the force taken to remove from the machine pin type sockets. It...

I've found all modern PGA sockets with the machine pin receptacles to be similar: I've tried mil-max, souriau, phoenix enterprises, and samtec. I don't think you're going to find a different design like the original SE/30 socket these days. Having done the trick with the machine pin headers, it...

These are the tests I perform on each booster card to make sure they test fine with a known good FPU. Basic tests: Can it boot and open speedometer without crashing, does Mac Test Pro test the logic board OK (includes FPU tests), and do the speedometer scores look consistent with expected. To...

This is normal. That's a huge .sit on a slower mac, and on top of that, later stuffit archive algorithms tend to be slow on any 68k. An accelerator will help speed it up, though it will not resolve it. You could use an emulator to decompress it (still slowly, but much faster) or use a PowerPC mac.

Yeah, no acceleration with a 5500 under OS X. Dumb framebuffer only, I played with it a few years back. You're better off with a Rage if you want to run OS X.

Not impossible but definitely fiddly. I did this to a 68882 with a lead borrowed from a vintage metal cap. I suspect there are better sources for pins, though. Maybe SMD PGA pins exist?

On a read, assuming your data was found in cache, the cache needs to service that access and terminate the bus cycle, instead of addressing whatever device/memory is desired (ie ROM/RAM/Framebuffer). Cached accelerators have an independent local bus on which the cache resides, which allows the...

Figured as much - I can't imagine they'd ship this version being unable to do so where they addressed it on others. The LCIII must just not be timing sensitive in the same ways the earlier machines are. Yeah, that's more along what I would expect to see.

Concur with @Phipli that FPU is running at 50mhz. If you really want to put this to bed, remove the FPU from the booster card and try again. On the SE30 version it is optional and will automatically use the LB FPU (if present) when no FPU is installed. You should see a reduction in the FPU...

Just FYI, Speedometer's FPU scores are not great for measuring raw FPU performance. They are rather strongly influenced by CPU performance. So I would hold off from drawing any conclusions based on that. Making some assumptions based on the SE30 design, I expect pin 6 of IC4 to be connected to...

How did you determine the clock speed of the 68882? Fun fact about the SE/30 Diimo - there's nothing precluding full-speed operation if the FPU is of an appropriate rating. I run my FPU at 58mhz on my clone.

Nice find!! There is some information on the resolutions supported by them in the charts in the first post. Seems like they are intended for HDTV and do high-res interlaced displays. I haven't seen any other HV cards in the wild, but given the relative scarcity of interware cards that doesn't...