Package: c64asm 0.1.4

c64asm: 6502 Assembler

A simple 6502 assembler written purely in R and leveraging R data structures for pre-computing character sets and images.

Authors:mikefc

# Install 'c64asm' in R:

install.packages('c64asm', repos = c('https://coolbutuseless.r-universe.dev', 'https://cloud.r-project.org'))

Datasets:

On CRAN:

Last updated from:5ff248e034. Checks:7 WARNING, 1 ERROR, 1 OK. Indexed: yes.

Target	Result	Time
linux-devel-x86_64	WARNING	126
source / vignettes	ERROR	189
linux-release-x86_64	WARNING	128
macos-release-arm64	WARNING	118
macos-oldrel-arm64	WARNING	91
windows-devel	WARNING	83
windows-release	WARNING	75
windows-oldrel	WARNING	76
wasm-release	OK	111

Vignettes and/or manual for this package failed to build, some documents may be unavailable. Please inspect thebuild logs for more information.

Help page	Topics
Regex patterns for parsing 6502 assembly	asm_patterns
Compile ASM to a c64 exectuable (in PRG format)	compile
Split each ASM line into tokens	create_line_tokens
Create the main compiler datastructure 'prg_df' from a list of `line_tokens`	create_prg_df
Determine the opcode, address mode etc for a sequence of tokens representing a single instruction	create_prg_df_row
Extract the raw bytes for the assembled PRG	extract_prg_bytes
Determine the opcode, address mode etc for a sequence of tokens representing a single instruction	get_opcode_info
Hex (character strings) to integer values	h2i
Fetch the high byte of a 16bit address	hi
Fetch the low byte of a 16bit address	lo
Reference list of opcode information	opcodes
Process any cross-referenced symbols to insert actual addresse/values	process_symbols
Pad out with zero bytes between address blocks	process_zero_padding
String to ASM for ".text" code	s2i
Save the PRG to file	save_prg
Convert a 16bit address to 2 bytes (lo_byte, hi_byte) as is the 6502 way	w2b