152 lines
3.8 KiB
HTML
152 lines
3.8 KiB
HTML
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<html>
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<head>
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<title>CHIBI PC-09 Technical Specification</title>
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<article class="markdown-body">
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<h1 id="chibi-pc-09-technical-specification">CHIBI PC-09 Technical Specification</h1>
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<p>5-17-21 Amber Zeller</p>
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<h2 id="quick-specs">Quick Specs</h2>
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<h4 id="cpu">CPU</h4>
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<p>1, 1.5, 2 MHz Motorola 6809</p>
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<h4 id="memory">Memory</h4>
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<p>64k SRAM on external card for optional MMU capability. Seperated into 2k blocks, numbered 0-31. Only 62k of memory is accessible, due to the I/O block.</p>
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<h4 id="i-o">I/O</h4>
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<p>2k block, position 30. Addresses EFFF-F7FE. Further subdivided into 128 devices of 16 addresses each. </p>
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<h2 id="address-space-diagram">Address Space Diagram</h2>
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<table>
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<thead>
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<tr>
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<th>Address Range</th>
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<th>Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>0000 - 07FF</td>
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<td>Kernal Root Block</td>
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</tr>
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<tr>
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<td>0800 - EFFE</td>
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<td>Standard Memory Blocks</td>
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</tr>
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<tr>
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<td>EFFF - F7FE</td>
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<td>I/O Block</td>
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</tr>
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<tr>
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<td>F7FF - FFFF</td>
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<td>Vector Block</td>
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</tr>
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</tbody>
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</table>
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<h2 id="i-o-block-description">I/O Block Description</h2>
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<p>11 bits per block</p>
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<p>128 devices are possible, though will likely never be used. </p>
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<table>
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<thead>
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<tr>
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<th>Bits</th>
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<th>Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>0-6</td>
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<td>Device selection</td>
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</tr>
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<tr>
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<td>7-10</td>
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<td>Address selection</td>
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</tr>
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</tbody>
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</table>
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<h2 id="expansion-card-description">Expansion Card Description</h2>
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<p>Byte 0 of every card should contain a descriptor. The structure of the descriptor is described in the following table.</p>
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<table>
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<thead>
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<tr>
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<th>Bits</th>
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<th>Descriptor</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>0-2</td>
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<td>Type</td>
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</tr>
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</tbody>
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</table>
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<h3 id="type-descriptor-table">Type Descriptor Table</h3>
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<table>
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<thead>
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<tr>
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<th>Type Descriptor</th>
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<th>Description</th>
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<th>Example</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>000</td>
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<td>Block Storage</td>
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<td>SD Card</td>
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</tr>
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<tr>
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<td>001</td>
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<td>ANSI I/O Stream</td>
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<td>UART</td>
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</tr>
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<tr>
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<td>010</td>
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<td>ANSI Compatible Graphics Device</td>
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<td>VGA64</td>
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</tr>
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<tr>
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<td>011</td>
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<td>Input Device</td>
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<td>Keyboard</td>
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</tr>
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<tr>
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<td>1xx</td>
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<td>Other</td>
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<td>Other</td>
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</tr>
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</tbody>
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</table>
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</article>
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</body>
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</html>
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