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A website with opcode tables for some 8-bit CPUs

Home Page: https://tobiasvl.github.io/optable

License: Creative Commons Zero v1.0 Universal

HTML 36.17% Ruby 0.94% Python 55.22% CSS 7.67%

opcodes 8-bit f8 intel-8080 intel-8085

optable's Introduction

Optable

optable [Latin: optabilis] (obsolete) That may be chosen; desirable.

A website with (reverse) opcode tables for various CPUs. Work in progress.

Inspired by Pastraiser's opcode tables and based on the GBDev Game Boy opcode table website.

File structure

Each architecture has two directories:

collections/<arch>/: HTML and Markdown templates
_data/<arch>/: Data sources
- generate_opcodes.py: Script that generates opcodes.json
- instructions.json: JSON file with all instructions
- flags.json: JSON file with flag registers

The file structure isn't very logical right now. The templates in collections shouldn't need to be duplicated per architecture, and should probably live in _layouts somehow. Pull requests rectifying this are very welcome.

optable's People

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optable's Issues

Stuff from todo file

6800 -> 6801/6803 (10 extra instructions)
6800 -> 6805 (ikke binary compatible)
6809 (prefix)

https://spivey.oriel.ox.ac.uk/wiki/images-corner/1/1a/Undoc6800.pdf

https://deramp.com/downloads/mfe_archive/050-Component%20Specifications/Motorola/CPUs/The%20Motorola%206800%20Instruction%20Set%20(Byte)(January%201978).pdf

Bytes and cycles should be on the same line (unless there are states)

Currently 8080/8085 is the only table with bytes, cycles AND states. All the other tables have the bytes and cycles on separate lines, which looks dumb.

M6800: Add all illegal opcodes

Investigate what all the illegal opcodes do, and add them.

Register overview

The descriptions for each table should have a register overview.

M6800: Add all instructions

M6800: Add cycles

Illegal opcodes without variants should fill the table cell

Currently illegal opcodes that don't have a variant don't fill the entire table cell. The striped background only covers the middle portion.

M6800: Illegal "store immediate" instructions are one byte longer

Correct M6800 header

Correct list of MPUs is:

M6800 (Motorola MC6800/MC6801/MC6803, Hitachi HD6301/HD6303)

but that might be a little long.

Remove Errata footer from CPUs without errata

Responsive design

The current tables don't work on mobile because I set the layout to fixed.

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