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54 lines
2.3 KiB
Markdown
54 lines
2.3 KiB
Markdown
# Champ - N. Harold Cham's 65C02 Profiler
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This is a 6502/65C02 emulator / profiler that enables you to really get to know your APPLE ][ HiRes Graphics Mode Demo.
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## Features
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* full, cycle-accurate 65C02 emulation
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* screen output as animated GIF with exact frame timing
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* average frame rate
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* see how much time is spent in which subroutine
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* watch variables (single variables or pairs)
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* no dependencies except Ruby, gcc and Merlin32
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## Usage
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First, make sure you have gcc, ruby and Merlin32 installed. You need to prepare a YAML file to tell champ about all source and object files and their memory locations.
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Take `plot3d.yaml` for example (using [Marc A. Golombeck's excellent 3D-Demo](https://github.com/mgolombeck/3D-Demo)):
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```
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load:
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0x6000: plot3d/plot3d242.s
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0x1200: plot3d/multtab.s
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0x8400: plot3d/ldrwtab.s
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0x8900: plot3d/SINETABLE
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0x8b00: plot3d/object2.s
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0x9000: plot3d/object1.s
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0x9500: plot3d/FONT
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0xb600: plot3d/projtab.s
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entry: ENTRY
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instant_rts:
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- LOAD1
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```
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We specified some source files (which will get compiled automatically) and some object files along with their locations in memory (`load`). We also specified the entry point for our program (`entry`), this can be a label or an address.
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Furthermore, we can disable subroutines by replacing the first opcode with a RTS (`instant_rts`). This is necessary in some cases because Champ does not emulate hardware and thus can not load data from disk, for example.
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To start champ, type:
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```
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$ ./champ.rb --max-frames 100 plot3d.yaml
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```
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This will run the emulator and write the HTML report to `report.html`. If you do not specify the maximum number of frames, you can still cancel the emulator by pressing Ctrl+C at any time. If you need fast results and don't need the animated GIF of all frames, specify the `--no-animation` flag, which will still give you all the information but without the animation.
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## Example report
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## Did you know?
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By the way, there's a full-fledged, incremental, standalone, no-dependencies GIF encoder in `pgif.c` that writes animated GIFs and uses some optimizations to further minimize space. It's stream-friendly and as you feed pixels in via `stdin`, it dutifully writes GIF data to `stdout` until `stdin` gets closed.
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