Nox-Rhea WiKi - back2root:ibm-pc-ms-dos:hardware

80x86-architecture

anonymous@undisclosed.example.com (Anonymous) — Sun, 03 Mar 2024 20:45:16 +0000

Intel 80x86 Family Architecture General purpose registers General Purpose Registers Segment Registers AH/AL AX (EAX) Accumulator CS

6845

anonymous@undisclosed.example.com (Anonymous) — Tue, 27 Aug 2024 12:54:18 +0000

6845 - Motorola CRT Controller The Motorola 6845, or MC6845, is a display controller that was widely used in 8-bit computers during the 1980s. Originally intended for designs based on the Motorola 6800 CPU and given a related part number, it was more widely used alongside various other processors, and was most commonly found in machines based on the Zilog Z80 and MOS 6502.

8042-ps2

anonymous@undisclosed.example.com (Anonymous) — Sun, 11 Jan 2026 21:17:40 +0000

8042 - Keyboard Controller (AT,PS/2) 8042 Commands & Responses - (Port 60h) Commands System Issues to Keyboard (write port 60h) Command Description

8250

anonymous@undisclosed.example.com (Anonymous) — Thu, 23 Feb 2023 19:55:13 +0000

8250 - UART - Universal Asynchronous Receiver/Transmitter Port Description 3F8h/2F8h Transmit/Receive Buffer (read/write) Baud Rate Divisor LSB if bit 7 of LCR is set (read/write)

8253

anonymous@undisclosed.example.com (Anonymous) — Sun, 11 Jan 2026 22:31:18 +0000

8253/8254 PIT - Programmable Interval Timer The Intel 8253 and 8254 are programmable interval timers (PITs), which perform timing and counting functions using three 16-bit counters. The 825x family was primarily designed for the Intel 8080/8085-processors, but were later used in x86 compatible systems. The 825x chips, or an equivalent circuit embedded in a larger chip, are found in all IBM PC compatibles.