Recent content by Melkhior

@Jockelill is proposing a NuBusFPGA carrier; those should work in any NuBus machine - most compatible, but slowest bus. Testing a design using the PDS slot for the MC68030 is more complex, as the machines with those PDS slots are all subtly different - the IIfx has the clock on a different pin...

Poor simms :-) The devices aren't limited to 3.3V on the power rail only; usually, the driver/buffer at the pins are also limited to 3.3V. Using 3.3V SIMMs in an unmodified 5V machine is likely to damage the DRAM chips. You're also potentially overloading capacitors - if there's traditional...

Everything but the DIN connector was done at JLCPCB (there's a LOT of 0402 capacitors on the backside, plus the oscillators and the flash for the FPGA). The DIN I soldered myself because I can do it and through-hole is expensive at JLCPCB (and they didn't have the connector in stock).

Not yet, still need to sort out the burst read issue and do more testing. Also I'm in Europe, and shipping to the U.S. has been too complex for a while, should I sell my surplus board it will be more locally (shipping internally in the E.U), sorry. Source and production files are on GitHub if...

Somewhat more expensive. And you need a different connector than the one used in the originals NuBusFPGA V1.0 and V1.2, as those are too low-riding on the PCB for the cable to fit in the slot adequately. An internal connector, small cable, and a proper 3D printed backplate would be a cheaper and...

The problem is only the size of the board - the bigger they are, the more expensive... you don't want to build something the size of a NuBus board if you can avoid it. In particular with more layers and/or more sophisticated processing. hehe, perfect timing: IIsiA7 Mini. My first design with...

I just use the board with a (homemade) riser with two PDS slot, so I can also have my (homemade) version of the SEthernet/30 and get Ethernet. For now I haven't bothered to make things pretty by having a proper backplate, I just run the cable to the inside of the machine... a bit 'yuck' but it...

Hello all, At last, the IIsiFPGA's smaller sibling is here: the IIsiA7 Mini. It's basically the same thing (the Highly Desirable Macintosh Interface for the IIsi), but smaller, so it shares a GitHub repo with the original version (and refers to itself as the IisiFPGA V3.0). So, what's new...

Becton & Dickisnon makes medical equipment, but the collective wisdom of the internet seems to not know what that is specifically...

Not quite; you have an interesting set of benchmarks here - they all reacts differently to the combinations of parameters! Good choices :-) If we compute the evolution from one line to the next for the 60 and 80 MHz, and then add the performance gain from 60=>80 MHz for the no-cache case (don't...

The "Claude" thing is creeping me out. The fake familiarity, the 'we', everything in the way it expresses itself... starting to read it, it made my skin crawl. It seems to be right in the uncanny valley for the written word. I don't know how you can deal with that thing. To each their own, I...

OK, I'll confess: I've recently bought IDT79RV4700-150GH - 64-bits, 3.3V, 150MHz MIPS R4000-class CPU in PGA179 package (same as the MC68040). They were dirt cheap, and they would fit my FPGA-based homebrew project... I've betrayed both 68k and SPARC... ... but my last received CPUs were...

No need to polute the thread any more than I've already done; I've ranted about my opinion time and time and again :-) My point exactly. Then backward compatibility is nigh impossible, and the future of the platform is bleak (darn, I'm doing it again :-/ )

Apple was surprisingly prescient in some of their design choices. MMU were not an obvious choice for personal computers when they introduced the II (which had a slot for a MC68851 and an even poorer substitute by default) and later IIx and SE/30, At the time it was mostly an expensive feature of...

And look where it got the Amiga platform... You could also hack memory expansion in some (most?) older systems (8-bits era). Turns out, the future was to not do that due to closer and closer integration of the memory controllers with the CPU. They eventually became built-in to the CPU in the...