Conceptual, architectural explainers — how a subsystem actually works underneath.
A practical distinction between HLE and LLE, firmware replacement, timing and side effects, legal provenance, hybrid systems, and compatibility testing.
A hardware-grounded guide to cartridge address decoding, PRG and graphics banks, mapper registers, mirroring, IRQs, save memory, and emulator tests.
How cartridge SRAM, flash, EEPROM, and RTC registers persist; how emulators serialize them; and why wall-clock policy, atomic writes, and testing matter.
How scanline sprite evaluation, object limits, priority, overflow quirks, flicker strategies, and emulator options shape authentic retro-console graphics.
How bracketed paste wraps pasted bytes, how line editors use the markers, where trust ends, and how terminal programs enable, parse, disable, and test it.
A control-flow model for shell errexit covering tested commands, lists, pipelines, functions, subshells, command substitutions, traps, and explicit errors.
A precise model of shell file descriptors, left-to-right redirection, duplication versus paths, grouping, pipelines, persistent descriptors, and safe logging.
A POSIX getopts pattern covering OPTIND, OPTARG, leading-colon diagnostics, required operands, repeated calls, function scope, and portable limitations.
A rigorous guide to shell here-document parsing, quoted delimiters, expansion, tab stripping, indentation, remote commands, and safer data handling.
A byte-accurate comparison of POSIX printf and echo covering option ambiguity, backslashes, format-string safety, arbitrary values, locales, and NUL limits.