This site is a mirror. The original can be found at http://www.cs.csubak.edu/~dgriffi/proj/p112/
Latest News as of May 10, 2006.
The P112 mailing list is a place to talk specifically about the P112 board.
The P112 subject pops up fairly often on the Usenet newsgroup comp.os.cpm. Reading it will help you get the most out of your P112.
Assorted pictures of my P112.
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. His page is here. In late 2004 on the Usenet Newsgroup comp.os.cpm, talk about making another run of P112 boards was discussed. I decided to step forward. With Dave Brooks blessing and the assistance of others, new boards were fabricated.
The Second Run of P112 boards has finished. I have approximately 26 left. The plan now is to build up stock so I can ship immediately. Due to the rise in prices of everything thanks to gasoline prices, the price for a kit is now $160 by money order ($165 by Paypal) for shipment to the continental United States. Outside the US, I'll need to check shipping rates. In either case, email me before sending payment.
This P112 board project is very different from the one Dave Brooks offered. The board itself is the same, but that's about all that stayed the same. The "native" operating system is now ZSDOS, an enhanced replacement for CP/M 2.2. The old DOS+ boot disk can still be used, but is discouraged. UZI-180, a Unix clone for the Z180 processor is available in a version specifically customized for the P112.
Instead of getting just a board with surface-mount parts mounted and little else, buyers get a complete kit. Except for a chassis, power supply, floppy drives, and tools (like soldering stuff); you get everything you need to get started. The documentation has been pulled together into a single PDF file, updated, edited, and cleaned up. A copy of the Walnut Creek CP/M CD dated Nov 1994 is included. No permission was needed to replicate it. Another CD is provided which contains the documentation PDF and lots of other stuff that was deemed interesting (like UZI-180).
No problem! One of my cohorts, Terry Gulczynski, will build and test your P112 for you. He has other services like adding more memory and adding an IDE interface. If that's what you want, please tell me when you email me.
Check out his website at http://home.cfl.rr.com/tgcons/ for more information.
The following disk images are retained for hysterical raisins.
If you have any questions or comments, feel free to email me at dgriffi;at;cs.csubak.edu.
This page was last updated on May 10, 2006