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| <section id="zilog-z180"> |
| <h1>Zilog Z180<a class="headerlink" href="#zilog-z180" title="Permalink to this heading"></a></h1> |
| <p><strong>P112</strong>. The P112 is a hobbyist single board computer based on a 16MHz |
| Z80182 with up to 1MB of memory, serial, parallel and diskette IO, and |
| realtime clock, in a 3.5-inch drive form factor. The P112 computer |
| originated as a commercial product of “D-X Designs Pty Ltd”[ of |
| Australia.</p> |
| <p>Dave Brooks was successfully funded through Kickstarter for and another |
| run of P112 boards in November of 2012. In addition Terry Gulczynski |
| makes additional P112 derivative hobbyist home brew computers.</p> |
| <p><strong>STATUS:</strong> Most of the NuttX is in port for both the Z80182 and for the |
| P112 board. Boards from Kickstarter project will not be available, |
| however, until the third quarter of 2013. So it will be some time before |
| this port is verified on hardware. Refer to the NuttX board |
| <a class="reference external" href="https://github.com/apache/nuttx/blob/master/Documentation/platforms/z80/z180/boards/p112/README.txt">README</a> |
| file for further information.</p> |
| <p>The arch/z80 directories contain files to support a variety of 8-bit architectures |
| from ZiLOG (and spin-architectures such as the Rabbit2000). The arch/z80/src/z180 |
| sub-directory contains logic unique to the classic Z180 family of chips.</p> |
| <p>Files in this directory include:</p> |
| <dl> |
| <dt><code class="docutils literal notranslate"><span class="pre">z180_head.asm</span></code></dt><dd><p>This is the main entry point into the Z180 program. This includes the |
| handler for the RESET, power-up interrupt vector and address zero and all |
| RST interrupts.</p> |
| </dd> |
| <dt><code class="docutils literal notranslate"><span class="pre">z180_rom.asm</span></code></dt><dd><p>Some architectures may have ROM located at address zero. In this case, a |
| special version of the “head” logic must be used. This special “head” |
| file is probably board-specific and, hence, belongs in the board-specific |
| boards/z80/z180/<board-name>/src directory. This file may, however, be |
| used as a model for such a board-specific file.</p> |
| <p>z180_rom.S is enabled by specifying CONFIG_LINKER_ROM_AT_0000 in the |
| configuration file.</p> |
| <p>A board specific version in the boards/z80/z180/<board-name>/src |
| directory can be used by:</p> |
| <ol class="arabic simple"> |
| <li><p>Define CONFIG_ARCH_HAVEHEAD</p></li> |
| <li><p>Add the board-specific head file, say <filename>.asm, to |
| boards/z80/z180/<board-name>/src</p></li> |
| <li><p>Add a file called Make.defs in the boards/z80/z180/<board-name>/src |
| directory containing the line: HEAD_ASRC = <file-name>.asm</p></li> |
| </ol> |
| </dd> |
| <dt><code class="docutils literal notranslate"><span class="pre">Make.defs</span></code></dt><dd><p>This is the standard makefile fragment that must be provided in all |
| chip directories. This fragment identifies the chip-specific file to |
| be used in building libarch.</p> |
| </dd> |
| <dt><code class="docutils literal notranslate"><span class="pre">chip.h</span></code></dt><dd><p>This is the standard header file that must be provided in all chip |
| directories.</p> |
| </dd> |
| <dt><code class="docutils literal notranslate"><span class="pre">z180_initialstate.c</span></code>, <code class="docutils literal notranslate"><span class="pre">z180_copystate.c</span></code>, <code class="docutils literal notranslate"><span class="pre">z180_restoreusercontext.asm</span></code>, <code class="docutils literal notranslate"><span class="pre">z180_saveusercontext.asm</span></code></dt><dd><p>These files implement the Z180 context switching logic</p> |
| </dd> |
| <dt><code class="docutils literal notranslate"><span class="pre">z180_schedulesigaction.c</span></code> and <code class="docutils literal notranslate"><span class="pre">z180_sigdeliver.c</span></code></dt><dd><p>These files implement Z180 signal handling.</p> |
| </dd> |
| </dl> |
| <section id="supported-boards"> |
| <h2>Supported Boards<a class="headerlink" href="#supported-boards" title="Permalink to this heading"></a></h2> |
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