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My 286-class CPU (real-mode only) is finally working in sim and we have PC-AT BIOS, VGA and IBM Basic working.😀 The CPU is written from scratch and uses a 5-stage pipeline, aiming to be fast enough to run early 90's games. The final core will be in between ao486... show more

nand2mario

3,212 subscribers

16,344 次观看 • 1 年前 •via X (Twitter)

Anya Rossi• Live Now

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13 条评论

Pixel Cherry Ninja 的头像

Pixel Cherry Ninja1 年前

Is this for Tang Console?

nand2mario 的头像

nand2mario1 年前

Yes. And it should straightforward to port to other FPGAs.

Premium 的头像

Premium1 年前

Try it. You'll never look back.

Marcelo Samsoniuk 的头像

Marcelo Samsoniuk1 年前

do you use microcode?

nand2mario 的头像

nand2mario1 年前

Most instructions are hardwired. Complex instructions like string ones are microcoded. So in good conditions, the pipeline could finish one instruction per cycle. Overally I try to follow the 80486 design.

Sipeed 的头像

Sipeed1 年前

What is the operating frequency ?

nand2mario 的头像

nand2mario1 年前

The main goal is lower cycles-per-instruction. It'll be a win if we can achieve 2 to 3 CPI, with 40-80Mhz Fmax. Current x86 softcores all have pretty poor CPI.

Hosein R 的头像

Hosein R1 年前

can we have same in risc-v also is there any book about concepts and step by step guide about this?

nand2mario 的头像

nand2mario1 年前

VexRiscv is a popular riscv softcore. For getting your hands dirty, you need a FPGA retro-gaming / retro-computing distribution. You can try MiSTer or my TangCore.

Jeff Geerling 的头像

Jeff Geerling1 年前

A Raspberry Pi CM5 laptop. Would you like to know more?

Lukas Henkel 的头像

Lukas Henkel1 年前

Very excited about this one, fresh from wafer dicing 🔍 I received the custom silicon-based inductors from Würth Elektronik that will be embedded in the SiP for the open-source smartwatch 🙌

YRabbit 的头像

YRabbit1 年前

Ladies and gentlemen! The first design for the #Gowin GW5A chip series to fully pass the whole Yosys->Nextpnr->Apicula->working-board chain!🍾 🍾 🍾 The design itself is nothing to write home about - just an inversion of the LED button, #fpga #sipeed #gowin #apicula

RossRadio 的头像

RossRadio1 年前

what circuit board..

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