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I have an old Keyspan USA-19HS serial adapter. Apparently there's a homebrew device driver install for it: https://github.com/Nitrokey/homebrew-drivers/blob/master/Casks/keyspan-usa-19hs.rb I expected to be able to type brew install keyspan-usa-19hs, but it couldn't find it. Is anyone able to...

I'm sure it would. I just don't have access to programming for FPGAs using a Mac (except if it's emulating Windows). I think the idea of multi-core Munt is quite interesting though.

Understandable. I did a little verilog for my MPhil. True, though it was pretty natural with Transputers. They had parallel process opcodes which linked in the address of a process to be scheduled by a hardware scheduler and then started or ran the process (startp and runp). Sure. I'm quite a...

I thought it was roughly every 2ms, but a refresh cycle is only a /RAS isn't it? A Mac Plus has plenty of CPU for handling many MIDI channels. Excellent! I've just been watching a video on the SAM2695, interesting GM sound module with some synth features. I used to have an MT-32. I'd probably...

Well, this is rather impressive! "Ken Designs" has developed a bare-metal SDK (compiled in gcc) which can boot on a classic Mac. He's used it to write a chip-8 emulator (which is fun, but not my primary interest). Check it out. It's also on Hackaday. I'm looking forward to seeing the SDK...

The graphics rendering code and most of the data used to construct a given frame will sit in a 1MB L2 cache and that means that most of the time, perhaps 95% to 98% of the time, it's avoiding main RAM. Not sure how that would work. Valkyrie I has its own video RAM and a queue of read/write...

If we go back to my PB1400c/166 results: Again, your PM6500/250 is close to proportionally faster. Scaling up the 16.3fps to 250MHz gives 24.5fps. The 250MHz PM6500 is 50% faster than my PB1400c/166, but also the bus speed on the PM6500 (50MHz) is 52% faster! So, assuming the video bandwidth...

Good point. If it's just http it should be OK on anything above 8.1. The PM6500 shipped with 7.5.5, but it seems like he can make bootable CDs for anything else. Personally I'd go with 9.1. I think @GerrySch is fairly fortunate to get a PM6500/300. It was the fastest 603e available, though, even...

It won't understand the AppleTalk protocol used to share the folder. However, if you've installed 9.2.1 as you say later, then you should be able to activate Personal Web Sharing on the 6500 and I think you can create a public folder on the Mac side you can drop files onto...

I guess because you haven't mentioned CD+/-RW, then you don't have a CD writer and writeable CDs any more? Does the 6500 recovery CD contain ClarisWorks? It has a terminal emulator application. With that you can download stuff over serial using e.g. the XModem protocol. For example, you could...

I once had a Duo230 and although I remember how much I hated the trackball, I'd forgotten how annoying the keyboard is. My LCII keyboard is quite nice, better than my PM4400 keyboard was (spongy, like a Sinclair membrane Rubber-key thing with proper key caps, which I guess is what it is ;-) )...

LOL!

Isn't it simply interleaved on a Mac Plus? During an active scan line, the CPU gets one 4 cycle memory fetch (to RAM) and the Video gets the other. It doesn't affect ROM and the CPU isn't stalled if it doesn't need to access RAM (e.g. internal CPU cycles). Because there's 60.15fps x 10944...

You really don't have 80MB mate. That happened to me too. I bought another 16MB of RAM for my PB1400 and the seller threw in a 166MHz PPC603ev (+the expected 128K cache). I was really thankful for that! I have also acquired a glitchy 133MHz CPU with 128kB of cache (but no heatsink, though I do...

Is your FPGA written in Verilog or VHDL? Can't you add external clocking, as that would be more helpful and accurate? BTW: if that's the nano Mac, it's great! Is the CPU running at approx the same rate as a real Mac/128/512/Plus/SE/Classic? e.g. are you using an OpenCores 68K?

She couldn't call it elefunk for future copyright reasons ;) !

Once PBX has mapped it, yes, e.g. bank 6 could be mapped to 64MB to 79MB, but that 16MB would just wrap around to 0. When checking RAM earlier, each Bank 1..7 can be mapped to the 16MB to 31MB region so they can be checked individually. Pretty good! I don't know why PBX works the way it does...

The PBX chip, which manages the physical to physical mapping, is on the Motherboard. So, if the Ram is plugged in the normal way, which I think it must be, then the limit must still be 64MB. To repeat. PBX is a 32-entry array of nibbles; one entry per 2MB of physical memory the motherboard can...

The way it works is that the serial port can be driven by an external clock. So, if the clock is at, e.g. 1MHz and you select 1MHz, then the SCC does a ÷32 to get 31250. But I think, also the MIDI Patchbay control panel sets it accordingly. I have used my Mac Plus with my MIDIMAN: I think you...