IBM Personal Computers
  II. HardWare
      A. CPUs (Central Processing Devices)
         1. Common Registers

 These registers, pointers, and flags are "lowest common denominator" 8088-8086
CPU oriented. Most programs available today on the PC market place, including
DOS, make no attempt to use the special or enhanced instructions availible on
the later CPUs which will execute xx88 code, such as the INTEL\80286,
INTEL\80386DX, NEC V20, V30, V40, or V50. Recent trends are toward higher
power applications which make use of, and sometimes require, extended registers

GENERAL REGISTERS  register                 definition
		      AX    accumulator (16 bit)
		      AH    accumulator high-order byte (8 bit)
		      AL    accumulator low order byte (8 bit)
		      BX    base (16 bit)
		      BH    base high-order byte (8 bit)
		      BL    base low-order byte (8 bit)
		      CX    count (16 bit)
		      CH    count high order byte (8 bit)
		      CL    count low order byte (8 bit)
		      DX    data (16 bit)
		      DH    date high order byte (8 bit)
		      DL    data low order byte (8 bit)
   I  IBM Personal Computers
      D. CPUs (Central Processing Devices)
         1. Common Registers

SEGMENT REGISTERS  register                 definition
		      CS    code  segment (16 bit)
		      DS    data  segment (16 bit)
		      SS    stack segment (16 bit)
		      ES    extra segment (16 bit)

INDEX REGISTERS    register                 definition
		      DI    destination index (16 bit)
		      SI    stack       index (16 bit)

SEGMENT REGISTERS  register                 definition
		      CS    code  segment (16 bit)
		      DS    data  segment (16 bit)
		      SS    stack segment (16 bit)
		      ES    extra segment (16 bit)

INDEX REGISTERS    register                 definition
		      DI    destination index (16 bit)
		      SI    stack       index (16 bit)

   I  IBM Personal Computers
      D. CPUs (Central Processing Devices)
         1. Common Registers

POINTERS           register                 definition
		      SP    stack pointer (16 bit)
		      BP    base pointer (16 bit)
		      IP    instruction pointer (16 bit)



FLAGS              AF, CF, DF, IF, OF, PF, SF, TF, ZF
 

PICList 2024 contributors: o List host: MIT, Site host massmind.org, Top posters @none found - Page Editors: James Newton, David Cary, and YOU! * Roman Black of Black Robotics donates from sales of Linistep stepper controller kits. * Ashley Roll of Digital Nemesis donates from sales of RCL-1 RS232 to TTL converters. * Monthly Subscribers: Gregg Rew. on-going support is MOST appreciated! * Contributors: Richard Seriani, Sr.

  .