The P500 is a member of the Commodore PET-II family of computers. It is a close relative to the Commodore 600 and 700.
While the Commodore 600/700 models were designed as business models with 80 column monochrome video, the P500 was designed as a home computer with 40 column video, featuring the VIC-II chip that was later available in the C64. Because the timing is controlled by the VIC, it is in fact determined by the video standard in use. So the other difference between the 600/700 computers and the P500 is that in the latter, the CPU is clocked with about 1MHz, while the former run with 2MHz.
•Extended BASIC 4.0
•40*25 video mode (16 colors)
•Available with PAL or NTSC video (needs VIC replacement)
•128k memory (one 64k bank is accessible by the VIC)
•Clocked with 1MHz
•Two joystick ports
•Parallel IEEE488 connector
•RS232 port. An ACIA (6551) chip allows baud rates up to 19200
•Builtin machine language monitor
•Optional memory extension (up to 256k internal, up to 1M externally)
•Optional Z80 or 8088 coprocessor boards
This information and further details can be found at http://www.von-bassewitz.de/uz/oldcomputers/p500/
Our machine is in excellent condition in the original box and has a serial number of 00525
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Commodore P500 Manuals:
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This exhibit has a reference ID of CH4861. Please quote this reference ID in any communication with the Centre for Computing History.