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Tools

Microcode Assembler (micro_asm.js)

Parses the /rtl/core/rom/microcode.asm file and produces a binary microcode. Very simple and has very few features. #102 starts instruction at position 102 * 4, and these values (102) map to the instruction decoder. Jumps inside the microcode (which are rare) also use these functions.

ModelSim HEX Generator (modelsim.js)

Intel's tools have a strange concept of hex and stipulate the number of bits that can appear on a line. This tool lets you convert a binary file into hex, while specifying the number of nibbles per line.

node modelsim.js input.bin output.hex 4

The trailing 4 specifies 4 nibbles per line, or 16 bits.

Image Preparation (prepare_image.js)

The core uses two image formats:

  • Background: 16 bit RGB565
  • Sprites: 8 bit alphas

This tool converts PNGs to either of those, using the input image dimentions. Expected dimensions are 360x360 for the background, and 400x50 for the spritesheet.

To convert a background:

node prepare_image.js input.png background.bin background

And sprites:

node prepare_image.js input.png sprite.bin sprites

Assembler and Disassember

I also built a 6200 assembler and disassembler, but those tools have now been relocated to the tamagotchi-disassembled project.