P112

From Wikipedia, the free encyclopedia
Jump to: navigation, search

The P112 is notable because it was the first of the hobbyist single board computers to reach the production stage.[1] The P112 hobbyist computers were relatively widespread and inspired other hobbyist centered home brew computing projects such as N8VEM home brew computing project. The P112 project still maintains many devoted enthusiasts and has an online repository of software and other information.[2]

The P112 computer originated as a commercial product[3] of "D-X Designs Pty Ltd" of Australia. They describe the computer as "The P112 is a stand-alone 8-bit CPU board. Typically running CP/M (tm) or a similar operating system, it provides a Z80182 (Z-80 upgrade) CPU with up to 1MB of memory, serial, parallel and diskette IO, and realtime clock, in a 3.5-inch drive form factor. Powered solely from 5V, it draws 150mA (nominal: not including disk drives) with a 16MHz CPU clock. Clock speeds up to 24.576MHz are possible."

The P112 board was last available new in 1996 by Dave Brooks. In late 2004 on the Usenet Newsgroup comp.os.cpm,[4] talk about making another run of P112 boards was discussed. David Griffith decided to produce additional P112 kits[5] with Dave Brooks blessing and the assistance of others. In addition Terry Gulczynski makes additional P112 derivative hobbyist home brew computers.[6] Hal Bower was very active in the mid 1990's on the P112 project and ported the "Banked/Portable BIOS".[7]

References[edit]