configs/p112: Add a configuration for the Z180 P112 board

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5429 42af7a65-404d-4744-a932-0658087f49c3

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diff --git a/nuttx/configs/p112/README.txt b/nuttx/configs/p112/README.txt
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+P112 README
+^^^^^^^^^^^
+
+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. 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, talk about making another run of P112
+boards was discussed. David Griffith decided to produce additional P112 kits
+with Dave Brooks blessing and the assistance of others. In addition Terry
+Gulczynski makes additional P112 derivative hobbyist home brew computers.
+Hal Bower was very active in the mid 1990's on the P112 project and ported
+the "Banked/Portable BIOS".
+