ibm pc later


(click on picture)


Introduced August 12, 1981
Discontinued April 2, 1987
Introduction Price  


System Architecture Ports Disk Storage
Processor: Intel 8088 @ 4.77 MHz
PMMU: none
FPU: none
Data Path:  
L1 Cache: none
L2 Cache: none
2nd Processor: none
Slots: none
Bus type ISA (Industry Standard Architecture)
Data Bus width  
Address bus width  
CMOS real time clock  
USB: none
ADB: none
Video: none
SCSI: none
Parallel: none
Geoports: none
Ethernet: none
FireWire: none
Mic Type: none
AirPort Ready: n/a
Other Ports:  
Floppy Size:  
Int HD Size: none
Int HD Interface: none
Orig CD Speed n/a
Int CD Support: n/a
Internal drive bays  
Standard floppy drives  
Optional floppy drives:  
* 5 1/4 inch 160k none
* 5 1/4 inch 1.2MB none
* 3 1/2 inch 400k  
* 3 1/2 inch 1.44MB none
* 3 1/2 inch 2.88MB none
Hard disk controller included none
Memory Video and Graphics
Logic Board:  
RAM Slots: 0, n/a
Min - Max RAM:  
Min RAM Speed:  
RAM Sizes: n/a
Install in Groups of: n/a
System board memory socket type  
Number of memory module sockets  
Graphics Processor  
Screen size - columns & rows  
Video on board  
Video RAM n/a
Max colors  
RGB output n/a
Composit Video Output none
Screen Resolution  
Sprites or Missiles none
Physical Specs. Software Power
Form Factor:  
Gestalt ID:  
Weight (lbs):  
Dimensions (in):  
Keyboard Specs  
Number of Keys  
upper/lower case  
Sound interface device  
Sound Generation  
ADSR capable no
Addressing Modes:  
Orig SSW:  
Orig Enabler: none
ROM Ver: n/a
ROM Size:  
AppleTalk Ver: n/a
Mac OS Supported:  
Max Watts:  
BTU per Hr:  
Voltage: 105-125
Freq Range: 50-60 Hz
Battery Type:  
Soft Power: n/a
Pass Through: n/a
Programming language  
Built in language none
Built in M L monitor none


System Architecture
Microprocessor Intel 8088 used in early models (AMD was used in later models)
Clock speed 4.77Mhz
Bus type ISA (Industry Standard Architecture)
Bus width 8-bit
Interrupt levels 8 (6 usable)
DMA channels 4 (3 usable)


Standard on system board 16k, 64k, or 256k(only after 1983)
Maximum on system board 64k or 256k
Maximum total memory 640k
Memory speed and type 200ns dynamic ram chips
System board memory socket type 16 pin DIP
Number of memory module sockets 27 (3 banks of 9 chips)
Memory used on system board 1 soldered bank of 9-16k X 1(early) or 64k X 1(later) bit chips.

27-16k X 1 for early PC's (Pre 1983) or

27-64k X 1 for PC's after 1983

Standard Features


Disk Storage

ROM size 40k ***** Internal disk and tape drive bays 2 full height
Optional math coprocessor 8087 ***** Standard floppy drives 1 X 360k
Standard graphics none   Optional floppy drives:  
Parallel printer ports none   * 5 1/4 inch 360k Optional
RS232C serial ports none   * 5 1/4 inch 1.2MB No
Mouse ports none   * 3 1/2 inch 720k Optional
UART chip used NS8250B   * 3 1/2 inch 1.44MB No
Maximum speed 9600bps   * 3 1/2 inch 2.88MB No
CMOS real time clock no   Hard disk controller included No
CMOS RAM none      

Expansion Slots


Keyboard Specs.

Total adapter slots 5-8 bit   Number of keys 83
Number of 8/16/32 bit slots 5/0/0   Keyboard cable length 6 feet

Physical Specs.


Environmental Specs.

Dimensions:     Power supply output 63.5 watts
* Height 5.5 inches   Operating voltage @ 60 Hz 104-127VAC
* Width 19.5 inches   Maximum current 2.5 amps
* Depth 16.0 inches      
* Weight 25 pounds