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US and German variants of Model B - Revision history
2024-03-28T17:19:54Z
Revision history for this page on the wiki
MediaWiki 1.30.0-rc.0
http://beebwiki.mdfs.net/index.php?title=US_and_German_variants_of_Model_B&diff=3310&oldid=prev
Kazzie: /* IC Numbers */ Add a few more numbers, based on https://stardot.org.uk/forums/download/file.php?id=38209&mode=view
2020-02-28T16:54:43Z
<p><span dir="auto"><span class="autocomment">IC Numbers: </span> Add a few more numbers, based on https://stardot.org.uk/forums/download/file.php?id=38209&mode=view</span></p>
<table class="diff diff-contentalign-left" data-mw="interface">
<col class="diff-marker" />
<col class="diff-content" />
<col class="diff-marker" />
<col class="diff-content" />
<tr style="vertical-align: top;" lang="en">
<td colspan="2" style="background-color: white; color:black; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: white; color:black; text-align: center;">Revision as of 16:54, 28 February 2020</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l18" >Line 18:</td>
<td colspan="2" class="diff-lineno">Line 18:</td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>| IC03 || 6522 System VIA || IC11</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>| IC03 || 6522 System VIA || IC11</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>|-  </div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>|-  </div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>| IC04 || 6850 ACIA || <del class="diffchange diffchange-inline">???</del></div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>| IC04 || 6850 ACIA || <ins class="diffchange diffchange-inline">IC91</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>|-  </div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>|-  </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>| IC05 || SAA5050 Teletext Generator || IC82</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>| IC05 || SAA5050 Teletext Generator || IC82</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>|-  </div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>|-  </div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>| IC06 || 5C094 Video ULA || <del class="diffchange diffchange-inline">??</del>?</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>| IC06 || 5C094 Video ULA || <ins class="diffchange diffchange-inline">IC83</ins>?</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>|-  </div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>|-  </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>| IC07 || 2c199 Serial ULA || IC92</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>| IC07 || 2c199 Serial ULA || IC92</div></td></tr>
<tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l42" >Line 42:</td>
<td colspan="2" class="diff-lineno">Line 42:</td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>| IC15 || 74LS273 Teletext chip buffer || IC81</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>| IC15 || 74LS273 Teletext chip buffer || IC81</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>|-  </div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>|-  </div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>| IC16 || LM555 timer || <del class="diffchange diffchange-inline">???</del></div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>| IC16 || LM555 timer || <ins class="diffchange diffchange-inline">IC46</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>|-  </div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>|-  </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>| IC17 || LM324 op-amp || IC24</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>| IC17 || LM324 op-amp || IC24</div></td></tr>
<tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l150" >Line 150:</td>
<td colspan="2" class="diff-lineno">Line 150:</td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>| IC69 || 6522 User VIA || IC17</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>| IC69 || 6522 User VIA || IC17</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>|-  </div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>|-  </div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>| IC70 || 74LS244 printer buffer || <del class="diffchange diffchange-inline">??</del>?</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>| IC70 || 74LS244 printer buffer || <ins class="diffchange diffchange-inline">IC10</ins>?</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>|-  </div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>|-  </div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>| IC71 || 74LS244 1MHz bus buffer || <del class="diffchange diffchange-inline">??</del>?</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>| IC71 || 74LS244 1MHz bus buffer || <ins class="diffchange diffchange-inline">IC14</ins>?</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>|-  </div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>|-  </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>| IC72 || 74LS245 1MHz bus transciever || ???</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>| IC72 || 74LS245 1MHz bus transciever || ???</div></td></tr>
</table>
Kazzie
http://beebwiki.mdfs.net/index.php?title=US_and_German_variants_of_Model_B&diff=3309&oldid=prev
Kazzie: Typo fix
2020-02-28T16:41:24Z
<p>Typo fix</p>
<table class="diff diff-contentalign-left" data-mw="interface">
<col class="diff-marker" />
<col class="diff-content" />
<col class="diff-marker" />
<col class="diff-content" />
<tr style="vertical-align: top;" lang="en">
<td colspan="2" style="background-color: white; color:black; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: white; color:black; text-align: center;">Revision as of 16:41, 28 February 2020</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l3" >Line 3:</td>
<td colspan="2" class="diff-lineno">Line 3:</td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>The US model had modifications to its display circuitry, to suit the 60Hz refresh rate used by NTSC televisions. The German model had a translated version of MOS.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>The US model had modifications to its display circuitry, to suit the 60Hz refresh rate used by NTSC televisions. The German model had a translated version of MOS.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Some US Model Bs were left unsold, and were converted back to a UK specification and sold at a reduced price. These are <del class="diffchange diffchange-inline">functionlaly </del>equivalent to a UK Model B, but the numbering of ICs and selection jumpers does not correspond to those listed in service documentation.</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Some US Model Bs were left unsold, and were converted back to a UK specification and sold at a reduced price. These are <ins class="diffchange diffchange-inline">mostly functionally </ins>equivalent to a UK Model B, but the numbering of ICs and selection jumpers does not correspond to those listed in service documentation.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>===IC Numbers===</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>===IC Numbers===</div></td></tr>
</table>
Kazzie
http://beebwiki.mdfs.net/index.php?title=US_and_German_variants_of_Model_B&diff=3308&oldid=prev
Kazzie: Have table collapsed by default
2020-02-28T16:37:19Z
<p>Have table collapsed by default</p>
<table class="diff diff-contentalign-left" data-mw="interface">
<col class="diff-marker" />
<col class="diff-content" />
<col class="diff-marker" />
<col class="diff-content" />
<tr style="vertical-align: top;" lang="en">
<td colspan="2" style="background-color: white; color:black; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: white; color:black; text-align: center;">Revision as of 16:37, 28 February 2020</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l7" >Line 7:</td>
<td colspan="2" class="diff-lineno">Line 7:</td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>===IC Numbers===</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>===IC Numbers===</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>{| class="wikitable sortable mw-collapsible <del class="diffchange diffchange-inline">mw-collapsed</del>" style="text-align:center;vertical-align:top"</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>{| class="wikitable sortable mw-collapsible" style="text-align:center;vertical-align:top"</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>|+ Model A/B  </div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>|+ Model A/B  </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>|-  </div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>|-  </div></td></tr>
</table>
Kazzie
http://beebwiki.mdfs.net/index.php?title=US_and_German_variants_of_Model_B&diff=3307&oldid=prev
Kazzie: Create with description and table of IC numbers
2020-02-28T16:36:43Z
<p>Create with description and table of IC numbers</p>
<p><b>New page</b></p><div>A special version of the BBC Model B was produced for export to the USA, and to Germany. These models had a redesigned mainboard, internal shielding to reduce electromagnetic interference, and all options (Econet, 8271 disk interface, speech) fitted as standard.<br />
<br />
The US model had modifications to its display circuitry, to suit the 60Hz refresh rate used by NTSC televisions. The German model had a translated version of MOS.<br />
<br />
Some US Model Bs were left unsold, and were converted back to a UK specification and sold at a reduced price. These are functionlaly equivalent to a UK Model B, but the numbering of ICs and selection jumpers does not correspond to those listed in service documentation.<br />
<br />
===IC Numbers===<br />
<br />
{| class="wikitable sortable mw-collapsible mw-collapsed" style="text-align:center;vertical-align:top"<br />
|+ Model A/B <br />
|- <br />
! UK Model !! Description !! US / German <br />
|-<br />
| IC01 || 6502 Processor || ???<br />
|- <br />
| IC02 || 6845 / 46505 CRT Controller|| IC34<br />
|- <br />
| IC03 || 6522 System VIA || IC11<br />
|- <br />
| IC04 || 6850 ACIA || ???<br />
|- <br />
| IC05 || SAA5050 Teletext Generator || IC82<br />
|- <br />
| IC06 || 5C094 Video ULA || ???<br />
|- <br />
| IC07 || 2c199 Serial ULA || IC92<br />
|- <br />
| IC08 || 81LS95 Hi-res row address buffer || IC27-31?<br />
|- <br />
| IC09 || 81LS95 Hi-res column address buffer || IC27-31?<br />
|- <br />
| IC10 || 81LS95 Teletext row address buffer || IC27-31?<br />
|- <br />
| IC11 || 81LS95 Teletext column address buffer || IC27-31?<br />
|- <br />
| IC12 || 81LS95 CPU row address buffer || IC27-31?<br />
|- <br />
| IC13 || 81LS95 CPU column address buffer || IC27-31?<br />
|- <br />
| IC14 || 74LS245 data bus transciever || IC80<br />
|- <br />
| IC15 || 74LS273 Teletext chip buffer || IC81<br />
|- <br />
| IC16 || LM555 timer || ???<br />
|- <br />
| IC17 || LM324 op-amp || IC24<br />
|- <br />
| IC18 || 76489 sound chip || IC23<br />
|- <br />
| IC19 || LM386 amplifier || IC25<br />
|- <br />
| IC20 || 74LS139 decoder || ???<br />
|- <br />
| IC21 || 74LS00 quad 2-input NAND|| ???<br />
|- <br />
| IC22 || 74LS30 8-input NAND || ???<br />
|- <br />
| IC23 || 74LS30 8-input NAND || ???<br />
|- <br />
| IC24 || 74LS138 decoder || ???<br />
|- <br />
| IC25 || 74LS20 dual 4-input NAND || ???<br />
|- <br />
| IC26 || 74LS139 decoder || ???<br />
|- <br />
| IC27 || 7438 quad 2-input NAND, open collector || ???<br />
|- <br />
| IC28 || 74LS51 dual 3-input AND-OR-Invert || IC44?<br />
|- <br />
| IC29 || 74LS32 quad 2-input OR || ???<br />
|- <br />
| IC30 || 74LS74 D flip-flop || ???<br />
|- <br />
| IC31 || 74LS74 D flip-flop || ???<br />
|- <br />
| IC32 || 74LS259 decoder || IC18<br />
|- <br />
| IC33 || 74LS04 hex inverter || ???<br />
|- <br />
| IC34 || 74LS74 D flip-flop || ???<br />
|- <br />
| IC35 || LM324 op-amp || IC93<br />
|- <br />
| IC36 || 74LS10 triple 3-input NAND || ???<br />
|- <br />
| IC37 || 74LS04 hex inverter || ???<br />
|- <br />
| IC38 || 74LS86 quad 2-input XOR || ???<br />
|- <br />
| IC39 || 72LS283 4-bit adder || ???<br />
|- <br />
| IC40 || 74S00 quad 2-input NAND || ???<br />
|- <br />
| IC41 || 74LS02 quad 2-input NOR || ???<br />
|- <br />
| IC42 || 74LS163 binary counter || ???<br />
|- <br />
| IC43 || 74S04 hex inverter || ???<br />
|- <br />
| IC44 || 74LS74 D flip-flop || IC97<br />
|- <br />
| IC45 || 74S139 decoder || IC54<br />
|- <br />
| IC46 || 74S74 D flip-flop || IC96<br />
|- <br />
| IC47 || 74LS86 quad XOR || IC98/99?<br />
|- <br />
| IC48 || 74LS86 quad XOR || IC98/99?<br />
|- <br />
| IC49 || 74LS00 quad 2-input NAND|| IC89/100?<br />
|- <br />
| IC50 || 74LS00 quad 2-input NAND || IC89/100?<br />
|- <br />
| IC51 || MOS ROM || IC71<br />
|- <br />
| IC52 || Sideways ROM || IC72-75<br />
|- <br />
| IC53 || 4816 RAM (D0 /CAS1) || ???<br />
|- <br />
| IC54 || 4816 RAM (D1 /CAS1) || ???<br />
|- <br />
| IC55 || 4816 RAM (D2 /CAS1) || ???<br />
|-<br />
| IC56 || 4816 RAM (D3 /CAS1) || ???<br />
|- <br />
| IC57 || 4816 RAM (D4 /CAS1) || ???<br />
|- <br />
| IC58 || 4816 RAM (D5 /CAS1) || ???<br />
|- <br />
| IC59 || 4816 RAM (D6 /CAS1) || ???<br />
|- <br />
| IC60 || 4816 RAM (D7 /CAS1) || ???<br />
|- <br />
| IC61 || 4816 RAM (D0 /CAS0) || ???<br />
|- <br />
| IC62 || 4816 RAM (D1 /CAS0) || ???<br />
|- <br />
| IC63 || 4816 RAM (D2 /CAS0) || ???<br />
|- <br />
| IC64 || 4816 RAM (D3 /CAS0) || ???<br />
|- <br />
| IC65 || 4816 RAM (D4 /CAS0) || ???<br />
|- <br />
| IC66 || 4816 RAM (D5 /CAS0) || ???<br />
|- <br />
| IC67 || 4816 RAM (D6 /CAS0) || ???<br />
|- <br />
| IC68 || 4816 RAM (D7 /CAS0) || ???<br />
|- <br />
| IC69 || 6522 User VIA || IC17<br />
|- <br />
| IC70 || 74LS244 printer buffer || ???<br />
|- <br />
| IC71 || 74LS244 1MHz bus buffer || ???<br />
|- <br />
| IC72 || 74LS245 1MHz bus transciever || ???<br />
|- <br />
| IC73 || PD7002 analog-digital converter || IC90<br />
|- <br />
| IC74 || 88LS120 RS423 transciever|| IC95<br />
|- <br />
| IC75 || DS3691 RS423 driver || IC94<br />
|- <br />
| IC76 || 74LS163 binary counter || ???<br />
|- <br />
| IC77 || 74LS00 quad 2-input NAND || ???<br />
|- <br />
| IC78 || 8271 floppy controller || IC16<br />
|- <br />
| IC79 || 7438 quad 2-input NAND, open collector || ???<br />
|- <br />
| IC80 || 7438 quad 2-input NAND, open collector || ???<br />
|- <br />
| IC81 || 74LS393 4-bit counter || ???<br />
|- <br />
| IC82 || 74LS10 triple 3-input NAND || IC36<br />
|- <br />
| IC83 || CD4013B CMOS D flip-flop || IC22?<br />
|- <br />
| IC84 || CD4013B CMOS D flip-flop || IC22?<br />
|- <br />
| IC85 || CD4020B CMOS binary counter || ???<br />
|- <br />
| IC86 || 74LS393 4-bit counter || IC4<br />
|- <br />
| IC87 || 74LS123 multivibrator || ???<br />
|- <br />
| IC88 || Sideways ROM || IC72-75?<br />
|- <br />
| IC89 || 68B54 Econet ADLC || IC84<br />
|- <br />
| IC90 || Econet clock || not fitted<br />
|- <br />
| IC91 || 74LS132 quad 2-input NAND, schmitt trigger || ???<br />
|- <br />
| IC92 || Econet clock || not fitted<br />
|- <br />
| IC93 || 75159 differential driver || ???<br />
|- <br />
| IC94 || LM319 comparator || ???<br />
|- <br />
| IC95 || LM319 comparator || ???<br />
|- <br />
| IC96 || 74LS244 Econet station ID buffer || IC90<br />
|- <br />
| IC97 || 74LS74 D flip-flop || ???<br />
|- <br />
| IC98 || TMS6100 speech chip || IC20<br />
|- <br />
| IC99 || TMS5220 phrase ROM || IC21<br />
|- <br />
| IC100 || Sideways ROM || IC72-75?<br />
|- <br />
| IC101 || Sideways ROM || IC72-75?<br />
<br />
|}<br />
[[Category:Hardware]]</div>
Kazzie