IBM 51xx PC Family Computers

This web site is not intended as an introduction to the IBM 51xx PC family of computers.
Instead, this web site is intended to be a reference for computer-savvy people who are already familiar with the IBM 51xx PC family of computers.
This web site contains information that ranges from basic to very technical.

For queries or assistance, I suggest that you seek that at the Vintage Computer Forums.

Manuals   IBM 4860/5140/5150/5155/5160/5162/5170 IBM Options and Adapters IBM Hardware Maintenance Service IBM Hardware Maintenance Reference Third Party

4860 =  PCjr 5140 =  PC Convertible 5150 =  PC 5151 =  Monochrome Display 5152 =  Graphics Printer 5153 =  Color Display                      ( display for CGA ) 5154 =  Enhanced Color Display      ( display for EGA or CGA ) 5155 =  Portable PC                        ( actually a portable XT ) 5160 =  XT 5161 =  Expansion Unit 5162 =  XT Model 286         ( XT-286 ) ( an AT class system, not XT ) 5170 =  AT 5175 =  Professional Graphics Display      ( display for PGA ) 5181 =  PC Compact Printer                     ( intended for the IBM PCjr ) 5182 =  PC Color Printer

IBM 5150  (IBM PC)
Documentation	Power Measurements
Motherboard Switch/Jumper Settings	Minimum Diagnostic Configuration
Known Problems/Issues	Test of SW1 and SW2 via BASIC
Motherboard Revisions	Using an AT-Class Keyboard
BIOS Revisions	VGA Cards
Some Expansion Cards and Options	Disk Cover Plate
Memory Map of the 640 KB to 1 MB Area	Substituting the U33 ROM
RAM Information	10/27/82 BIOS - Problem of less than 4 banks of RAM
Motherboard Diagrams	Early Versions
Cassette BASIC
POST and Initialisation

IBM 5151 Documentation Video Cable CRT Heater

IBM 5152 Documentation

IBM 5153 Documentation Known Problems/Issues

IBM 5154 Documentation Known Problems/Issues

IBM 5155  (IBM Portable PC)
Documentation	Power Measurements
Motherboard Switch/Jumper Settings	Minimum Diagnostic Configuration
Known Problems/Issues	Test of SW1 via BASIC
Motherboard Revisions	Expansion Slot 8
BIOS Revisions	Photo of Inside
Some Expansion Cards and Options	Connection of CRT Display Unit to Video Card
Memory Map of the 640 KB to 1 MB Area	CRT Shield Removal
RAM Information	Power Supply
Motherboard Diagrams
Cassette BASIC
POST and Initialisation

IBM 5160  (IBM XT)
Documentation	Power Measurements
Motherboard Switch/Jumper Settings	Minimum Diagnostic Configuration
Known Problems/Issues	Test of SW1 via BASIC
Motherboard Revisions	Using an AT-Class Keyboard
BIOS Revisions	VGA Cards
Some Expansion Cards and Options	Expansion Slot 8
Memory Map of the 640 KB to 1 MB Area	Significant Differences to the IBM 5150
RAM Information	IBM/Xebec HDD Controllers Supplied
Motherboard Diagrams	Hard Drive Cabling
Cassette BASIC
POST and Initialisation

IBM 5161 Documentation Cable

IBM 5162  (IBM XT Model 286) Documentation Battery Known Problems/Issues Photos BIOS Revisions   Motherboard Diagrams

IBM 5170  (IBM AT)
Documentation	SETUP Procedure
Motherboard Switch/Jumper Settings	Hard Drive Type Number
Known Problems/Issues	Hard Drive Cabling
Motherboard Revisions	Some On-Screen POST Errors
BIOS Revisions	Battery
Some Expansion Cards and Options	Support for 3.5" Diskettes
Memory Map of the 640 KB to 1 MB Area	Failures of the CMI 6426 Hard Drive
RAM Information
Motherboard Diagrams
Cassette BASIC

IBM 5175 Documentation

IBM 5181 Documentation

IBM 5182 Documentation

ROMs
Images of Various ROMs
Images of BIOS ROMs for IBM 5150/5155/5160/5162/5170
Images of BIOS ROMs for Certain XT Clones
Supersoft/Landmark Diagnostic ROMs for IBM 5150/5155/5160/5170

Miscellaneous
DOS Programs	Commonly Failing Electronic Components (in vintage computers)
RTC Programs	Changes to the ST-506/ST-412 Interface
MDA / CGA / EGA	Micro Solutions Backpack CD-ROM Drive
BIOS Video Modes	Transferring Files From a Modern PC to an Old PC
POST Cards	History of 5150/5155/5160/5170 Motherboard Failure at the VCF
Resources at Other Internet Sites	Floppy Crossover Cable - Wiring
Serial ports

Out of Scope
Laptops - External Power Supply - Unregulated versus Regulated