The Draftsbook Blog
Articles, deep dives, and notes from the engineering community.
Part 5: 8085 Assembly Language Programming: Practical Algorithms, Arithmetic Routines, and Memory Manipulation
A hands-on engineering guide to 8085 assembly programming: 8-bit and 16-bit multi-byte addition/subtraction with carry, array searching, bubble sort algorithms, and calibrated hardware delay loop calculations.
By Md. Harun-Or-Roshid
Part 4: Intel 8085 Instruction Set and Addressing Modes: Data Formats, Opcodes, and Machine Cycles
A masterclass on the 8085 instruction set architecture: 1-byte, 2-byte, and 3-byte instruction formats, the 5 addressing modes, functional instruction groups, and T-state machine cycle timing.
By Md. Harun-Or-Roshid
Part 3: Intel 8085 Microprocessor Architecture: Internal Hardware, Registers, and Bus Demultiplexing
Comprehensive architectural analysis of the Intel 8085 CPU: functional block diagram, ALU, the 5 status flags, general and special purpose registers, timing & control unit, and address bus demultiplexing using a 74LS373 latch.
By Md. Harun-Or-Roshid
Part 2: Taxonomy of Microprocessors: CISC, RISC, EPIC, Vector, and Multicore Architectures
A deep dive into processor classification architectures. Contrast CISC versus RISC design philosophies, explore EPIC, Vector, SIMD Array processors, and superscalar instruction-level parallelism.
By Md. Harun-Or-Roshid
Part 1: Microprocessor Evolution, Architectural Generations, and Operating Fundamentals
A foundational exploration of microprocessor architecture, tracing five decades of silicon evolution from the 4-bit Intel 4004 to modern multicore SoCs, alongside key performance metrics and the fundamental machine cycle.
By Md. Harun-Or-Roshid
Part 1: The HTML5 Semantic Document Tree: Semantic Tags, ARIA & SEO Architecture
Master the HTML5 semantic document tree, modern layout tags, ARIA landmark roles, and search engine optimization principles for accessible web engineering.
By Md. Harun-Or-Roshid