SYSTEMS_C64.md

Highbyte.DotNet6502.Systems.Commodore64.C64

Overview

A partial implementation of a Commodore 64.

Current capabilities

• Run Commodore Basic 2.0 from ROM (user supplied Kernal, Basic, and Chargen ROM files).

• Limited VIC2 video chip support (Render provider: Rasterizer)

  • Standard, extended and multi-color character modes
  • Standard and multi-color bitmap mode
  • Sprites (hi-res & multi-color)
  • IRQ (raster, sprite collision)
  • Background and border color possible to per raster line
  • Fine scrolling per raster line

• Minimal VIC2 video chip support (Render provider: VideoCommands)

  • Standard character mode (normal case only), no custom character set.

• Limited CIA chip support

  • Keyboard
  • Joystick
  • Timers
  • IRQ

• Limited SID 6581 audio chip support

• Limited 1541 disk drive support

  • Attach .d64 disk images
  • Load directory and files to the C64 using the Basic LOAD command

• Blazor Browser (WASM), Avalonia Browser (WASM) and Desktop, SilkNet Desktop, and SadConsole Desktop app UI:s

1541 Disk Drive Support

The C64 emulator now includes limited support for the Commodore 1541 disk drive. You can:

• Attach .d64 disk image files to the emulator
• Use the C64's Basic LOAD command to load the disk directory and files from the attached disk image
• Example: LOAD "$",8 to list the directory, or LOAD "FILENAME",8 to load a file

Note: Only basic directory and file loading is supported. Advanced disk operations, file writing, and copy protection schemes are not supported.

C64 programs that works and how to run them

See SYSTEMS_C64_COMPATIBLE_PRG.md for .D64 images.

For advanced use: how to extract PRG files from D64 disk images see SYSTEMS_C64_HOW_TO_EXTRACT_PRG_FROM_D64_IMAGE

C64 Basic AI code completion

See SYSTEMS_C64_AI_CODE_COMPLETION.md`

Implementations

• System logic Highbyte.DotNet6502.Systems.Commodore64

• Rendering

  • Highbyte.DotNet6502.Impl.SilkNet.Commodore64.Video
  • Highbyte.DotNet6502.Impl.Skia.Commodore64.Video
  • Highbyte.DotNet6502.Impl.SadConsole.Commodore64.Video

• Input

  • Highbyte.DotNet6502.Impl.SilkNet.Commodore64.Input
  • Highbyte.DotNet6502.Impl.AspNet.Commodore64.Input
  • Highbyte.DotNet6502.Impl.SadConsole.Commodore64.Input

• Audio

  • Highbyte.DotNet6502.Impl.NAudio.Commodore64.Audio
  • Highbyte.DotNet6502.Impl.AspNet.Commodore64.Audio

TODO

Monitor commands

Additional machine code monitor commands specific to the C64 system.

Commands:
  lb     C64 - Load a Commodore Basic 2.0 PRG file from file picker dialog.
  llb    C64 - Load a Commodore Basic 2.0 PRG file from host file system.
  sb     C64 - Save a Commodore Basic 2.0 PRG file to host file system.