pet 4016


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Introduced 1978
Discontinued ???
Release Price $995


            The PET 4016 was the second in the series of what will become a long running series of PET computers designed by Chuck Peddle, (who also designed the 6502 microprocessor) and marketed by Commodore

           The 4000 series PETs came with an improved ROM giving them the capability to access the new disk drives released with them. The 4016 and its bigger sibling the 4032 are basically identical to the later 2000 series except for some internal changes to how the video is accessed to speed up the graphics display. A fix incorporated into the 4000 and later series to correct a problem with the 2000 series that drastically slowed down the PETs when graphics were displayed. 

          Early on type in patch was discovered for the early PETs. It seems that the video chip was able to be accelerated by poking a value to a specific address. The problem came when the new fixed PETs arrived, it seems that by poking the value to the same address in the newer PETs would cause the video chip to accelerate to the point they would overheat and destroy themselves. Thus the term 'killer poke' soon became a well known legend in PET history.   

        The 4016 comes with 16K of RAM and has 4 open sockets that I believe is for upgrading it to 32K. There are two ports in the rear of the computer, the one on the left is for the VIC-1530 Datassette and the one on the right is for connecting an IEEE-488 parallel device such as a printer or floppy disk drive. A second Datassette connector is inside the computer at the front left hand side of the motherboard. On the right side of the computer is an expansion slot, but I don't know what it is used for. 

        This 4016 has a metal case, although some version of the 4000 and even some 2000 series PETs came with molded plastic cases. This makes it a very heavy computer. The power supply is built into the case and consists of primarily a very large transformer in the left rear of the computer apparently supplying power for the computer and the monitor. They could have taken a lesson from the Apple people and used a switched power supply, it would have saved a lot of weight. 

             I added this PET 4016 to the museum on November 5, 1999 and I would like to thank Roger Shepherd for selling it to me. 




System Architecture



Microprocessor MOS 6502 Standard on system board 16k
Clock speed 1Mhz Maximum on system board 32k
Bus type CBM proprietary Maximum total memory 64k
Data bus width   Memory speed and type unknown
Address bus width 8-bit System board memory socket type 16 pin DIP
Interrupt levels ??? Number of memory module sockets unknown
DMA channels ??? Memory used on system board unknown

Standard Features


Disk Storage

ROM size 8k Internal disk and tape drive bays none
Optional math coprocessor none Standard floppy drives external tape drive
Parallel port type no Optional floppy drives: 1
RS232C serial ports no * 5 1/4 inch 160k optional
Mouse ports no * 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 * 3 1/2 inch 2.88MB No
CMOS RAM none Hard disk controller included No

Video & Graphics



Graphics Processor ??? Sound Interface device internal speaker
Screen size - Col x Rows 40 x 25 Sound generation tone generator
Resolution - Colors/High 1 / 200 x 192 ADSR capable no
Resolution - Colors/Low 1 - 40 x 25    
Max colors mono-green & white Programming language  
Sprites or Missiles none Built in language Microsoft Basic
    Built in M L monitor no

Expansion Slots


Keyboard Specs.

Total adapter slots 1-8 bit Number of keys 72
Number of 8/16/32 bit slots 1/0/0 Upper/lower case yes/yes
    Keyboard cable length N/A

Physical Specs.


Environmental Specs.

* Height 16 inches Operating voltage @ 60 Hz 104-127VAC
* Width 17.5 inches Maximum power supplied ???
* Depth 19 inches Power supply output - volts ???
* Weight 25 pounds Power supply output - amps ???