One Hobbyist Rebuilt 3dfx Voodoo Graphics Inside an FPGA
Recreating Voodoo Graphics and a Late-1990s Gaming PC on an FPGA
After a month of work on his z486 MiSTer core, nand2mario built zSST, a SystemVerilog implementation of the 3dfx Voodoo Graphics (SST-1) chip. Combined with his z486 CPU on a Xilinx KV260 board, it forms z486 XL: a DOS PC with Voodoo graphics running at 100 MHz. Tomb Raider now runs with its original 3dfx renderer, and the hardest part was feeding the pixel pipeline from memory.
I ended up spending more time designing, tuning, and debugging the memory system than the arithmetic pipeline.
- jumploops
In case it's helpful to anyone, MiSTer is a project[0] that recreates classic computers and video game consoles on hardware.
What do I mean by hardware?
Rather than emulating the device in software, which can cause various issues (especially related to timing), by mapping the actual device logic to a field programmable gate array (FPGA), you can achieve an "exact" replica of the hardware.
It's a super cool project, and I highly recommend checking it out if you have an interest in old machines (Apple II, Commodore 64, etc.).
- userbinator
It seems that within the past few years, there have been a great increase in the number of articles on low-level GPU internals/programming, which was previously a very niche subject. However, once you understand that a GPU is conceptually a processor specialised for graphics operations, with its own instruction set and RAM, then everything seems quite straightforward, and you can actually start thinking about how to implement one.
The specification is a behavioral target, rather than a circuit diagram.
Did anyone else get a slight feeling of LLM-ism from that sentence? Not a complaint, because I've noticed AI is definitely leading to some great boosts (the somewhat related https://news.ycombinator.com/item?id=49717638 is on the front page as I write this.)
- monster_truck
I mowed lawns for two summers to save up for a Voodoo 3000 PCI, still didn't even have half of what I needed. Parents covered the rest. Basically nothing I had hoped to be able to play worked. Spent an entire summer just trying to get Arcanum to even run, never did succeed. Learned a whole lot.
Goddamn if that buyer's remorse didn't scar me for life, the amount of researching I did before any purchase from then on was obsessive. I still think of the card fondly for what it represented to 10 year old me. This story does have a happy ending, we ended up getting a Dell XPS not long after with a Pentium 3 & a GeForce 2, back when they were still beige.
- shoobiedoo
So bummed out that I wrecked the HDMI out on my MiSTer. I was trying to figure out a new monitor layout and unplugged/plugged it in a few times. I could SSH into it no problem, but no HDMI out. After peeking around on the forums, turns out that the MiSTer doesn't take kindly to that while it's still on-- I forget the technical reason. Oh well. Many, many hours of fun playing games with my son on the it, I got my money's worth.
- wk_end
Tomb Raider (1996) ostensibly required a Pentium, and I remember (though memory may be faulty) the demo refusing to run on my 486. Does this FPGA 486 support the additional Pentium instructions?