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VICE x64 is a GUI emulator that requires a real X11/Wayland display. In this headless environment the KERNAL/BASIC/CHAR/1541 ROMs had to be fetched manually, autostart produced blank screenshots (no display to render to), and no other C64 emulator is installed. The oscar64 built-in emulator (-e) is the practical headless test tool. VICE is left in build.sh as -v / -V for interactive use in a real terminal session, but tasks.md and README.md are updated to reflect that the development loop and all Verify steps use the oscar64 emulator. Removed the failed test artifacts from src/build/.
68 lines
2.4 KiB
Markdown
68 lines
2.4 KiB
Markdown
# nyuller
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A C64 programming project using [Oscar64](https://github.com/drmortalwombat/oscar64)
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as the cross-compiler. Oscar64 is checked in as a git submodule under
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`./oscar64/`.
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## Layout
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```
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.
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├── oscar64/ # Oscar64 cross-compiler (git submodule)
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├── docs/c64/ # Low-level C64 reference (memory map, VIC, CIA, SID, …)
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├── src/ # Your C code
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│ ├── helloworld.c
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│ └── build.sh # Compile + run helper
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├── OSCAR64.md # Notes on the Oscar64 compiler internals
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└── PROG_C64.md # Notes on programming the C64 hardware
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```
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## First-time setup
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```sh
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# 1. Clone with submodules:
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git clone --recurse-submodules <this-repo-url>
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# Or, if you already cloned without --recurse-submodules:
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git submodule update --init --recursive
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```
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## Building
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```sh
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cd src
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./build.sh # compile helloworld.c → src/build/helloworld.prg
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./build.sh -e # run in oscar64's built-in emulator (headless, fast)
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./build.sh -v # run in VICE x64 (interactive, needs a real display)
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./build.sh -V # run in VICE x64sc (interactive, cycle-exact)
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./build.sh -c # just compile
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```
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`build.sh` will build the oscar64 compiler automatically the first time
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(it runs `make -C make compiler` inside `./oscar64/` if
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`./oscar64/bin/oscar64` doesn't exist yet).
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**Default test tool is the oscar64 built-in emulator** (`-e`): it
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runs headless, needs no ROMs, no display, and is fast. Every `Verify`
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step in `tasks.md` uses this.
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**VICE 3.9 is installed** at `/usr/bin/` (`x64`, `x64sc`, `x128`,
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`xvic`, `xpet`) and is available via `-v` / `-V`. It is a GUI
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emulator and **needs a real X11 / Wayland display to render** — it
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won't produce useful screenshots in this headless environment.
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Use it from a real terminal session for interactive play-testing
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and cycle-exact validation of raster IRQ and SID timing; don't
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expect to script it.
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## Documentation
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- `PROG_C64.md` — how the C64 hardware actually works, from a low-level
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programming perspective. Start here if you want to understand what's
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going on under the hood.
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- `OSCAR64.md` — how the Oscar64 compiler works internally, plus a C64-
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specific section on how to use it well (memory model, bank switching,
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raster IRQs, common mistakes).
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- `docs/c64/` — downloaded reference material: the full Commodore 64
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Programmer's Reference Guide text, Christian Bauer's canonical VIC-II
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paper, and per-chip reference notes.
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