ao486_MiSTer
NyuziProcessor
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| ao486_MiSTer | NyuziProcessor | |
|---|---|---|
| 21 | 9 | |
| 235 | 1,900 | |
| 1.3% | - | |
| 5.8 | 2.7 | |
| 7 days ago | 3 months ago | |
| Verilog | C | |
| GNU General Public License v3.0 or later | Apache License 2.0 |
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ao486_MiSTer
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Reverse engineering the Intel 386 processor's register cell
How about a 486 instead? :)
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Issues with AO486
Have you checked all the details in https://github.com/MiSTer-devel/ao486_MiSTer ?
- Ao486_MiSTer: i486 core for the MiSTer FPGA gaming system
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Recently, I came across a video on Youtube by Linus Tech Tips about the PCEm emulator that I found to be cringy and ill-informed. As a computer engineer by education let me explain few core concepts on how emulation works.
You mention "Pentium MMX CPU" a few times in your post, but fail to mention any FPGA solution that can emulate a machine of that class. MiSTer can't do that, the best it can do is a 486 (not just missing MMX, doesn't even have an FPU).
- Exact 486 CPU Performance in Smallest Form Factor
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Emulate Any ISA Card With A Raspberry Pi And An FPGA
It has already happened: https://github.com/MiSTer-devel/ao486_MiSTer
- Are there FPGA cores for SB16/ET4KW32/NE2K?
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KEYBCS2
The last processor generation it worked on is the 486, but on a Pentium or newer it always fails with a “Debugging is not allowed” message.
I guessed the reason for that correctly - prefetch queue. Mentions of CUP386 in the comments also brought back more memories of the cracking scene in the late 80s/early 90s. There's some very interesting discussion on SMC vs CPU behaviour here --- in the context of an open-source 486-level SoC core:
NyuziProcessor
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FuryGpu – Custom PCIe FPGA GPU
There's also Nyuzi which is more GPGPU focused https://github.com/jbush001/NyuziProcessor, but the author also experimented with having it do 3D graphics.
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The WeeCee – Tiny Vortex86-Based DOS Gaming PC
You could probably layer a software implementation of the rasterization pipeline on top of a compute-focused open-source GPU architecture like Nyuzi: https://github.com/jbush001/NyuziProcessor/
I would expect a 2x slowdown over hardware rasterization, based on NVIDIA's work on such an approach, but this is probably fine if you're just trying to match Voodoo3 performance. And one could imagine bolting a minimal hardware rasterizer on top of Nyuzi to speed things up once the software implementation is working.
- FPGA as a GPU for Linux
- Nyuzi – An Experimental Open-Source FPGA GPGPU Processor
- An Experimental (Open-Source FPGA) GPGPU Processor called Nyuzi (by @jbush001)
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Exploring RustFFT's SIMD Architecture
Sounds like the Nyuzi processor :D
What are some alternatives?
dosbox-x - DOSBox-X fork of the DOSBox project
vdpau-va-driver-vp9 - Experimental VP9 codec support for vdpau-va-driver (NVIDIA VDPAU-VAAPI wrapper) and chromium-vaapi
PCem-ROMs - This is a collection of requiered ROMs files for PCem emulator. RIP PCem 2021
openvga
elks - Embeddable Linux Kernel Subset - Linux for 8086
TrellisBoard - Ultimate ECP5 development board
libi86 - Attempt to reimplement non-standard C library facilities (e.g. <conio.h>) used in MS-DOS programs, for IA-16 GCC & ACK ― mirror of https://gitlab.com/tkchia/libi86 • Ubuntu packages for cross-compilation at https://launchpad.net/%7Etkchia/+archive/ubuntu/build-ia16/ • DJGPP/MS-DOS binaries at https://github.com/tkchia/libi86/releases
hardware - Verilog development and verification project for HOL4
microwatt - A tiny Open POWER ISA softcore written in VHDL 2008
OpenSimplex2 - C implementation for CPU and GPU of OpenSimplex 2
vISA
JuicyPixels-stbir - Interface to STB Image Resize for the Haskell image library JuicyPixels