http://ravrlab.ru/en/cs/sysprog/ Recent content in Systems programming on RAVR Lab Hugo en-us Fri, 27 Mar 2026 00:00:00 +0000 http://ravrlab.ru/en/cs/sysprog/graphlibs/ Fri, 27 Mar 2026 00:00:00 +0000 http://ravrlab.ru/en/cs/sysprog/graphlibs/ You can draw graphics on CPU (Software rendering) and on GPU (Shaders): CPU is often used to render UI elems (text, buttons, etc.) GPU is used to render complex visual scenes, so games are usually GPU-rendered Shaders is a direct program on a GPU (it is not a «visual effect», it is just a math program). Graphical libs can be roughly split into 3 levels: low, mid, high. Low Level Here you write shaders by hand. http://ravrlab.ru/en/cs/sysprog/filesys/ Sun, 01 Feb 2026 00:00:00 +0000 http://ravrlab.ru/en/cs/sysprog/filesys/ Definitions Filesystem — data structure and logic used by OS to translate logical files into physical blocks on a storage device. It manages 3 primary things: Storage mapping — tracking which disk sectors belong to which file Metadata — storing attributes like timestamps, permissions, file names. Space management — recording which areas are free or occupied. File — logical abstraction of a contiguous byte stream, treated as a single unit by the OS. http://ravrlab.ru/en/cs/sysprog/sysprogmap/ Sun, 01 Feb 2026 00:00:00 +0000 http://ravrlab.ru/en/cs/sysprog/sysprogmap/ Systems programming main domains: CPU Architecture PC Architecture OS CPU/PC Digital circuits: transistors level microprocessor, microcontroller, FPGA, ASIC CPU Architecture: CPU (Logical gates, ALU, Opcodes/Decoder, Clock, Stack, Interruptions) ISA (x86, CISC/RISC, ARM) Memory (Registers, Volatile/non-volatile mem, cache) IO (Display/VGA, Mouse/KB, Soundcard) PC Hardware: BIOS/UEFI (firmware, microcode, CMOS/EEPROM) Motherboard, Bridges RAM (volatile-mem) Storages (floppy, flash, CD, HDD, SDD) Peripherals Digital circuits terms In this context: CPU is logical component («idea» of instruction performing machine) microprocessor is physical chip with actual CPU Terms: http://ravrlab.ru/en/cs/sysprog/ansi_encoding/ Sat, 07 Dec 2024 00:00:00 +0000 http://ravrlab.ru/en/cs/sysprog/ansi_encoding/ Table of content: Encoding in general ANSI chars 0-127 Coding pages Unicode Encoding on Windows How encoding works in Windows cmd New line in Windows cmd Encoding in general ANSI chars 0-127 https://en.wikipedia.org/wiki/ASCII ANSI chars 0-127 (decimal), 00-7F (hexa): 1 2 3 4 5 6 7 8 9 10 | 0 1 2 3 4 5 6 7 8 9 A B C D E F ---+---------------------------------------------------------------- 0x | NUL SOH STX ETX EOT ENQ ACK BEL BS HT LF VT FF CR SO SI 1x | DLE DC1 DC2 DC3 DC4 NAK SYN ETB CAN EM SUB ESC FS GS RS US 2x | SP !