This VS Code project implements an assembler for the CHASM CPU. It is written in mostly-procedural C++, with only a little OOP.
The code is very basic and has a lot of avoidable copy-and-pasting in it; CHAS is meant to be adequate, not good.
CHAS has no dependencies. It should build with a simple cmake -S src build; cmake --build build in the project's root directory.
The syntax for running CHAS is:
`chas [--print-opcodes] [--base <address>] [--o <filename>] <filename>`
`--print-opcodes`: Emits a complete space-separated list of the instruction mnemonics currently supported by this version of CHAS.
`--base <address>`: Sets the base address. CHASM ROMs start at 0x3000 (the default). Userland programs in a multitasking OS start at 0x0000.
`--o <filename>` or `--output <filename>`: Sets the output filename. Default is input filename with `.o` appended.
`<filename>`: The last argument is the file to assemble.
Arguments are parsed from left to right, so --base and --o must precede <filename>.
The opcodes and instructions are defined in https://github.com/rhetorica/chas/blob/master/doc/chasm-spec.txt
The file doc/CHAS.xml provides syntax highlighting for Notepad++ in UDL format.
This repository is a component of the LETHE project, which aims to build a complete software stack based on the Dhar programming language. Read more at http://lethe.rhetori.ca/