j8ger

An 8 bit homebrew computer

For this project I've taken inspiration from existing CPUs I read about. Mainly the 6502, 6809, BMOW1, and Gigatron. The final system should have capabilities similar to or exceeding the original NES and C64. Take a look at the Project Goals here.

CPU:

• Architecture Diagram
• 8Mhz Clock Speed
• 8bit ALU with ADD, SUB, AND, OR, XOR
• 1MB RAM (Bank Switched)
• 1 (8-bit) Accumulator
• 2 (8-bit) Index Registers
• 1 (16-bit) Address Register
• 1 (16-bit) Program Counter
• 1 (16-bit) Stack Pointer
• 1 (16-bit) User Index Register
• Movable Zero Page
• Compatible with 6502 Assembly ( *Mostly )

GPU:

• 320x240 VGA Graphics with 8 bit color
• Tiled Background:
  • Tiles: 8px/8px
  • 40x30 tiles
  • Each tile can have up to 16 colors from a palette
  • Each tile can choose from 8 palettes
  • Smooth scrolling
• Sprites:
  • Sprites: 8px/8px
  • 256 Sprites per screen
  • Sprites can have up to 16 colors from a palette
  • Each sprite can choose from 8 palettes
  • All sprites can move on each frame
• Possible framebuffer mode for full resolution graphics