What is it?
Tangerine SOC is a system on chip design written in VHDL language. Such SOC is sutable to be synthesized and placed in a programmable chip - FPGA ( for now: AMD Artix A7-200 ).
In order to test the design You will need a Qmtech Artix A7-200 board with a base board ( schematics included in repo ).
But there is another way :P. I've created an emulator, that simulates almost all SOC features. It can even run directly in your browser :).
The main cpu of Tangerine is a RISC-V 32IM ( nekoRv ). It runs at 100MHz, providing quite plenty of computing power.
In addition to CPU, there is a bitmap acceleration coprocessor ( blitter 2D ) that offloads cpu from bitmap copying, scaling, drawing rectangles.
You can also enjoy 16-bit stereo audio thanks to I2S controller with DMA.
SD card acts as a storage.
2x USB for connecting a keyboard and mouse ( nand2mario USB Host ).
Source code Links
Tangerine SOC repository
Software examples sources
Tangerine SOC emulator repository
Tangerine Emulator live demos
Demos available below are included as Tangerine SOC software examples.
Clicking on an image launches emulator, which executes native RISC-V code in browser :)
Yes, it runs DOOM :)
( arrows - move, 'a' and 'd' - strafe, 'w' - fire )
Asteroids - bitmap copy and scale with mask.
Bootloader - just for fun, it requires a serial port which is not emulated.
Commanche - use arrow keys to steer.
Donut :P.
Emulator - Shell app running on RISC-V emulator running on ... RISC-V emulated in Webassembly. A bit slow though.
Fractal - some math fun.
Raycaster - wolf clone.
Raytrace - tiny raytracer demo.
Shell - file operations app ( emulated storage is read-only ). Check the 'snd' directory for Amiga modules, and 'obj' for 3d objects.
Tunnel - gfx effect.