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ao486_MiSTer reviews and mentions
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Reverse engineering the Intel 386 processor's register cell
How about a 486 instead? :)
https://github.com/MiSTer-devel/ao486_MiSTer
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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:
https://github.com/MiSTer-devel/ao486_MiSTer/issues/33
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A note from our sponsor - WorkOS
workos.com | 25 Apr 2024
Stats
MiSTer-devel/ao486_MiSTer is an open source project licensed under GNU General Public License v3.0 or later which is an OSI approved license.
The primary programming language of ao486_MiSTer is Verilog.
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