Lesson plan
P112
The P112 is a stand-alone 8-bit CPU board. Typically running CP/M or a similar operating system, it provides a Z80182 (Z80 upgrade) CPU with up to 1MB of SRAM memory, 32KB of in-system programmable flash ROM, serial, parallel and diskette I/O, and a real-time clock, in a 3.5-inch drive form factor. Powered solely from 5V, it draws 150mA (nominal: not including disk drives) with a 16 MHz CPU clock. Clock speeds up to 24.576 MHz are possible. The P112 is notable because it was the first of the hobbyist single-board computers to reach the production stage. 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. The P112 computer originated as a commercial product of "D-X Designs Pty Ltd" of Australia in 1996. As of August 2016, Dave Brooks has released the hardware and software components of P112 into the public domain, under the GPL. The PCB layout is available in the original Protel format, and translated into the current Altium Designer 16 format, which many PCB fabricators can accept. The P112 board was last available new in 1996 by Dave Brooks.…
Article summary
The P112 is a stand-alone 8-bit CPU board. Typically running CP/M or a similar operating system, it provides a Z80182 (Z80 upgrade) CPU with up to 1MB of SRAM memory, 32KB of in-system programmable flash ROM, serial, parallel and diskette I/O, and a real-time clock, in a 3.5-inch drive form factor. Powered solely from 5V, it draws 150mA (nominal: not including disk drives) with a 16 MHz CPU clock. Clock speeds up to 24.576 MHz are possible. The P112 is notable because it was the first of the hobbyist single-board computers to reach the production stage. 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. The P112 computer originated as a commercial product of "D-X Designs Pty Ltd" of Australia in 1996. As of August 2016, Dave Brooks has released the hardware and software components of P112 into the public domain, under the GPL. The PCB layout is available in the original Protel format, and translated into the current Altium Designer 16 format, which many PCB fabricators can accept. The P112 board was last available new in 1996 by Dave Brooks.…
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Discussion questions
- Summarise the article in your own words. Which single claim would you verify first, and why?
- Which claim in this article is most likely to be revised as the sources update? How would you check its current status?
- If two sources disagreed about one of these facts, what would you need in order to trust one over the other?
Bibliography
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Key claims and bibliography are generated from the same tracked claims and sources as the article page.