apple iii

home buttonup buttonback buttonnext button

002 003 004 005
006 007 008 009
010 011 012 013
014 015 016 017
018 019 020 021
022 023 024 025
026 027 028 029
030 031 032  
(click on picture)


Introduced   May 19, 1980
Discontinued   April 24, 1984  
Release Price     $4,340.00


      Late in 1978 the Apple Computer Company was selling Apple IIs as fast as they could make them. The Apple II was rapidly becoming the best selling home computer in the world eventually surpassing the Radio Shack TRS-80 in 1980. But Apple's senior management began to worry that the Apple II may run out of steam before the next generation of Apples projected for the mid 80's would be ready. 

      The decision was made to develop a new computer for the interim to replace the Apple II. The project, code named 'Sara', would be headed by an engineer named Wendell Sander. The computer would be strictly a business machine leaving the Apple II to handle the home market. 

      The new computer would be built to meet the requirements dictated by the business market such as an 80 column machine with upper and lower case characters. The computer would have improved graphics, sound and would sport and internal clock. It would have a new faster microprocessor and memory would be increased up to 256k. All of these improvements were certainly attainable with the technology of the day. 

      But the Apple senior management added 2 requirements that would eventually doom the Sara project. The first was to make the new computer able to run Apple II software. The problem was, in order for the Apple III to run Apple II software on its new architecture an 'emulator' program would have to be used. With an emulation program each and every line of code of the Apple II program would have to be intercepted, interpreted, and converted to run on the new system. This as you can imagine is time consuming, but is extremely inefficient when the microprocessors are different. 

      Eventually Sander complained to the senior management that the emulation situation would not work with the different processors. Apple management solved the problem for him by ordering him to use the 6502 microprocessor. The same processor used in the older Apple II. Sander knew this was a mistake, the 6502 was an underpowered processor when it was chosen for the original Apple I computer by Steve Wozniak (he chose it solely based on its cheap price, rather than its technical superiority). Hardly an adequate choice to run a new powerful business computer, besides the new computer was expected to have at least 256k of RAM and the architecture of the 6502 was limited to directly accessing only 64k of RAM.

       The second requirement was that Wendell was to have the Apple III ready in one year. The requirement was made so the Apple III could be announced in time to prove that Apple was not a one-hit wonder and prop up it's stock before the IPO deadline in late 1980.

        The Apple III was introduced in May of 1980 at the National Computer Conference in Anaheim, California. The first shipments were in late 1980 and almost from the start they failed. There were a myriad of problems such as overheating due to the close proximity of the option board compartment caused in part by Steve Jobs insisting on cosmetic changes to the exterior case design. 

        Other problems included chips popping out of their sockets and circuit traces on boards shorting on screws that were exceeding minimum tolerances by cramming them into cramp spaces. The failure rate of the first shipments was almost 100%. At first Apple ignored the initial feedback that there were problems with the Apple III, They were caught up in the IPO whirlwind. But as the IPO fervor of the died down, reality set in and the Apple III problem had to be addressed. 

        Finally early in 1981 Apple decided to pull the Apple III from the market and redesign it. At the end of 1981 the reborn Apple III was introduced with the problems fixed and more RAM added (up to 512k). The business community loved it and started buying them again for their offices. 

        Unfortunately Apple's senior management, Regis McKenna in particular, was not happy with the Apple III. He saw the Apple III as a blemish on Apple's reputation, a reminder to the world that Apple could screw up. He wanted the Apple III dumped to make room for the soon to be released new line of Apples. So he refused to promote it.

       Without any promotion and development the Apple III quickly died  and Apple pulled the plug on it in the fall of 1985 orphaning thousands of loyal Apple III owners.

        Today the Apple III computers are a very sought after collectable due to the limited run of only about 120,000 units.

             This Apple III was added to my museum on October 18, 2000. I purchased it on Ebay and would like to thank Bret for selling it to me. He let it go at a very low price and his sacrifice is very much appreciated.


System Architecture



Microprocessor SYNERTEK 6502A   Standard on system board 128k (256k later versions)
Clock speed 2  MHz   Maximum on system board 512k
Bus type Apple Proprietary   Maximum total memory 512k
Data bus width 8-bit   Memory speed and type  
Address bus width 16-bit   System board memory socket type  
Interrupt levels N/A   Number of memory module sockets  
DMA channels N/A   Memory used on system board  

Standard Features


Disk Storage

ROM size 4k   Internal disk and tape drive bays 1 - 5 1/4 Floppy Drive
Optional math coprocessor no   Standard floppy drives 5 1/4 inch Floppy Drive
Parallel port type none   Optional floppy drives: up to 4 external
RS232C serial ports yes   * 5 1/4 inch 143k yes
Mouse ports internal I/O socket   * 5 1/4 inch 1.2MB no
UART chip used N/A   * 3 1/2 inch 720k no
Maximum speed N/A   * 3 1/2 inch 1.44MB no
CMOS real time clock no (yes on  later models)   * 3 1/2 inch 2.88MB no
CMOS RAM no   Hard disk controller included no

Video & Graphics



Graphics Processor uses CPU   Sound Interface device uses CPU
Screen size - Col x Rows 80 x 24   Sound generation tone output to speaker
Resolution - Colors/High 2 / 560 x 192   ADSR capable no
Resolution - Colors/Low 16 / 280 x 192      
Max colors 16   Programming language  
Sprites or Missiles none   Built in language Applesoft BASIC
      Built in M L monitor yes

Expansion Slots


Keyboard Specs.

Total adapter slots 4   Number of keys 73
Number of 8/16/32 bit slots 8 / 0 / 0   Upper/lower case yes / yes
      Keyboard cable length N/A

Physical Specs.


Environmental Specs.

* Height   6 1/4  inches   Operating voltage @ 60 Hz 120 VAC
* Width  17 1/2 inches   Maximum power supplied  
* Depth  18 inches   Power supply output - volts +5V/-5V/+12V/-12V
* Weight  25 pounds   Power supply output - amps