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It's more than just the width of the ALU, the 6502 just does more per clock cycle than the Z80. At the lowest level, the 6502 reads/writes to memory in one cycle. The Z80 depending on whether it's the instruction fetch or something else takes 2 or 3 cycles to access memory. As the insruction level, ...

I keep promising myself that "one day" that bench will be tidied. In the mean time ... Img_5384-small.jpg Richard Russell has released an updated version of BBC Basic for the Z80 https://www.bbcbasic.co.uk/bbcbasic/z80basic.html Basic 5 is based on the Archimedes version of basic, instead ...

Thank you for the very quick response. I assume that you are referring to one or more of the 4116 chips failing, which is also a common curse on the Spectrum. As mentioned, I'm completely new to the MTX, so I'm therefore intrigued to understand why a VRAM issue might also cause basic BASIC commands...

Excuse the messy bench, I just had to own up to Dave about the extra feature I slipped into the FPGA version 4.05 code. Andy's floating Point accelerator from ReMemorizor/ReMemotech. Performance is exactly the same as ReMemorizor, so 9m 11s to complete the benchmark Mandelbrot. Unlike CPM3 there won...

stephen_usher wrote: ↑11 Mar 2025 00:23

Martin A wrote: ↑25 Feb 2025 19:59 That's a question for Claus, he's the king of the MSX conversions.

Unfortunately it looks like he's not logged in since November.

And it's his Forum !

That's a question for Claus, he's the king of the MSX conversions.

Seeing as CPM3 on other platforms often had incompatible disk formats to CPM2 on the same machine, is there a reason for keeping the old restrictions in the original BIOS? CPM2 has been left exactly as it was, there's no changes to the bootrom or the BIOS, that's to ensure compatibility. With HexTr...

Should that be the other way around ? MFX uses #90 to 93, NFX used #A0 to A3.

Floating point on ReMemotech and my fat Cyclone 4 equipped MFX board uses #A0 to A5

so I'm guessing the NFX used the same Wiznet hardware (and same ports?), thus MFX networking might be enabled by the NFX code? NFX was just a test of the concept, so there were actually 2 different WIZnet boards used in the NFX. The WIZ811MJ with a W5100 in the first couple of test boards and WIZ81...

The proof of concept "GO3.COM" is written and seems to be working OK. I don't have a Cyclone2 equipped MFX here for testing, so I used the Cyclone2 DE1 running ReMemotech instead! Img_5345-small.jpg Not only does GO3 seem to work as expected, it's working at 25MHz. Now with that distractio...