ao486_MiSTer
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| VexRiscvBPluginGenerator | ao486_MiSTer | |
|---|---|---|
| 1 | 21 | |
| 14 | 235 | |
| - | 1.3% | |
| 0.0 | 5.8 | |
| over 1 year ago | 7 days ago | |
| C | Verilog | |
| MIT License | GNU General Public License v3.0 or later |
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VexRiscvBPluginGenerator
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What is your take on ISA architectures for FPGAs (x86, arm, risc-v)?
I'd say beyond availability, the primary advantage for embedded use it the adaptability of the ISA. If you just need a small microcontroller, the core can be very small; if you need some specific performance point, you can use a bigger core, some extensions (or part thereof) could help, and you can always roll your own instructions in the 'custom' opcode space to reach your goals.
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:
What are some alternatives?
microwatt - A tiny Open POWER ISA softcore written in VHDL 2008
dosbox-x - DOSBox-X fork of the DOSBox project
vISA
PCem-ROMs - This is a collection of requiered ROMs files for PCem emulator. RIP PCem 2021
elks - Embeddable Linux Kernel Subset - Linux for 8086
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
NyuziProcessor - GPGPU microprocessor architecture
gcc-ia16 - Fork of Lambertsen & Jenner (& al.)'s IA-16 (Intel 16-bit x86) port of GNU compilers ― added far pointers & more • use https://github.com/tkchia/build-ia16 to build • Ubuntu binaries at https://launchpad.net/%7Etkchia/+archive/ubuntu/build-ia16/ • DJGPP/MS-DOS binaries at https://gitlab.com/tkchia/build-ia16/-/releases • mirror of https://gitlab.com/tkchia/gcc-ia16
winevdm - 16-bit Windows (Windows 1.x, 2.x, 3.0, 3.1, etc.) on 64-bit Windows
chipyard - An Agile RISC-V SoC Design Framework with in-order cores, out-of-order cores, accelerators, and more