https://wikiti.brandonw.net/index.php?title=83Plus:Overclocking&feed=atom&action=history83Plus:Overclocking - Revision history2024-03-29T05:32:43ZRevision history for this page on the wikiMediaWiki 1.23.5https://wikiti.brandonw.net/index.php?title=83Plus:Overclocking&diff=11703&oldid=prevDr. D'nar: Ugh, fix characters AGAIN2020-05-08T03:36:48Z<p>Ugh, fix characters AGAIN</p>
<table class='diff diff-contentalign-left'>
<col class='diff-marker' />
<col class='diff-content' />
<col class='diff-marker' />
<col class='diff-content' />
<tr style='vertical-align: top;'>
<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 03:36, 8 May 2020</td>
</tr><tr><td colspan="2" class="diff-lineno">Line 12:</td>
<td colspan="2" class="diff-lineno">Line 12:</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>[[File:TA1 ASIC overclock.jpg|350px|thumb|right|Image of the TA1 ASIC highlighting the relevant pins. Note the silk-screened pin 51 label.]]</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>[[File:TA1 ASIC overclock.jpg|350px|thumb|right|Image of the TA1 ASIC highlighting the relevant pins. Note the silk-screened pin 51 label.]]</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>Each successive CPU speed mode enables more resistors in parallel. In mode 0, only R08D is used; in mode 1, R07D is in parallel with R08D. On my (DrDnar's) calculators, I get R08D &#8776;&nbsp;1.8&nbsp;k<del class="diffchange diffchange-inline">? </del>and R07D &#8776;&nbsp;1.2&nbsp;k<del class="diffchange diffchange-inline">?</del>. To overclock CPU speed 1 to &#8776;&nbsp;20.4&nbsp;MHz, replace R07D with an 820&nbsp;<del class="diffchange diffchange-inline">? </del>resistor. 20&nbsp;MHz is pushing the limits of what the flash chip is spec'd for, so consider instead 910&nbsp;<del class="diffchange diffchange-inline">? </del>for &#8776;&nbsp;19&nbsp;MHz, or 1&nbsp;k<del class="diffchange diffchange-inline">? </del>for &#8776;&nbsp;18&nbsp;MHz, which should hopefully be safe for all calculators.</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>Each successive CPU speed mode enables more resistors in parallel. In mode 0, only R08D is used; in mode 1, R07D is in parallel with R08D. On my (DrDnar's) calculators, I get R08D &#8776;&nbsp;1.8&nbsp;k<ins class="diffchange diffchange-inline">&#8486; </ins>and R07D &#8776;&nbsp;1.2&nbsp;k<ins class="diffchange diffchange-inline">&#8486;</ins>. To overclock CPU speed 1 to &#8776;&nbsp;20.4&nbsp;MHz, replace R07D with an 820&nbsp;<ins class="diffchange diffchange-inline">&#8486; </ins>resistor. 20&nbsp;MHz is pushing the limits of what the flash chip is spec'd for, so consider instead 910&nbsp;<ins class="diffchange diffchange-inline">&#8486; </ins>for &#8776;&nbsp;19&nbsp;MHz, or 1&nbsp;k<ins class="diffchange diffchange-inline">&#8486; </ins>for &#8776;&nbsp;18&nbsp;MHz, which should hopefully be safe for all calculators.</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>However, a much easier---though less precise---method is to adjust R07D with a pencil. The graphite marks left by pencils are actually conductive, and it turns out that HB pencil marks are in the right range for adjusting the resistor's value. By drawing a really heavy mark over the face of the whole resistor, you can pull down the resistance enough to get 18-19 or so MHz. It's also possible that a different weight lead like 9B might be even more conductive, allowing even faster speeds, and you can always smudge the graphite off with your finger if the calculator proves unstable.</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>However, a much easier---though less precise---method is to adjust R07D with a pencil. The graphite marks left by pencils are actually conductive, and it turns out that HB pencil marks are in the right range for adjusting the resistor's value. By drawing a really heavy mark over the face of the whole resistor, you can pull down the resistance enough to get 18-19 or so MHz. It's also possible that a different weight lead like 9B might be even more conductive, allowing even faster speeds, and you can always smudge the graphite off with your finger if the calculator proves unstable.</div></td></tr>
</table>Dr. D'narhttps://wikiti.brandonw.net/index.php?title=83Plus:Overclocking&diff=11702&oldid=prevDr. D'nar: Pencils: The great makeshift trim pot2020-05-08T03:19:04Z<p>Pencils: The great makeshift trim pot</p>
<table class='diff diff-contentalign-left'>
<col class='diff-marker' />
<col class='diff-content' />
<col class='diff-marker' />
<col class='diff-content' />
<tr style='vertical-align: top;'>
<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 03:19, 8 May 2020</td>
</tr><tr><td colspan="2" class="diff-lineno">Line 13:</td>
<td colspan="2" class="diff-lineno">Line 13:</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>Each successive CPU speed mode enables more resistors in parallel. In mode 0, only R08D is used; in mode 1, R07D is in parallel with R08D. On my (DrDnar's) calculators, I get R08D &#8776;&nbsp;1.8&nbsp;k? and R07D &#8776;&nbsp;1.2&nbsp;k?. To overclock CPU speed 1 to &#8776;&nbsp;20.4&nbsp;MHz, replace R07D with an 820&nbsp;? resistor. 20&nbsp;MHz is pushing the limits of what the flash chip is spec'd for, so consider instead 910&nbsp;? for &#8776;&nbsp;19&nbsp;MHz, or 1&nbsp;k? for &#8776;&nbsp;18&nbsp;MHz, which should hopefully be safe for all calculators.</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>Each successive CPU speed mode enables more resistors in parallel. In mode 0, only R08D is used; in mode 1, R07D is in parallel with R08D. On my (DrDnar's) calculators, I get R08D &#8776;&nbsp;1.8&nbsp;k? and R07D &#8776;&nbsp;1.2&nbsp;k?. To overclock CPU speed 1 to &#8776;&nbsp;20.4&nbsp;MHz, replace R07D with an 820&nbsp;? resistor. 20&nbsp;MHz is pushing the limits of what the flash chip is spec'd for, so consider instead 910&nbsp;? for &#8776;&nbsp;19&nbsp;MHz, or 1&nbsp;k? for &#8776;&nbsp;18&nbsp;MHz, which should hopefully be safe for all calculators.</div></td></tr>
<tr><td colspan="2"> </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><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </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><ins style="font-weight: bold; text-decoration: none;">However, a much easier---though less precise---method is to adjust R07D with a pencil. The graphite marks left by pencils are actually conductive, and it turns out that HB pencil marks are in the right range for adjusting the resistor's value. By drawing a really heavy mark over the face of the whole resistor, you can pull down the resistance enough to get 18-19 or so MHz. It's also possible that a different weight lead like 9B might be even more conductive, allowing even faster speeds, and you can always smudge the graphite off with your finger if the calculator proves unstable.</ins></div></td></tr>
</table>Dr. D'narhttps://wikiti.brandonw.net/index.php?title=83Plus:Overclocking&diff=11699&oldid=prevDr. D'nar: Hopefully fix characters2020-05-08T00:14:26Z<p>Hopefully fix characters</p>
<table class='diff diff-contentalign-left'>
<col class='diff-marker' />
<col class='diff-content' />
<col class='diff-marker' />
<col class='diff-content' />
<tr style='vertical-align: top;'>
<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 00:14, 8 May 2020</td>
</tr><tr><td colspan="2" class="diff-lineno">Line 12:</td>
<td colspan="2" class="diff-lineno">Line 12:</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>[[File:TA1 ASIC overclock.jpg|350px|thumb|right|Image of the TA1 ASIC highlighting the relevant pins. Note the silk-screened pin 51 label.]]</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>[[File:TA1 ASIC overclock.jpg|350px|thumb|right|Image of the TA1 ASIC highlighting the relevant pins. Note the silk-screened pin 51 label.]]</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>Each successive CPU speed mode enables more resistors in parallel. In mode 0, only R08D is used; in mode 1, R07D is in parallel with R08D. On my (DrDnar's) calculators, I get R08D <del class="diffchange diffchange-inline">?</del>&nbsp;1.8&nbsp;k? and R07D <del class="diffchange diffchange-inline">?</del>&nbsp;1.2&nbsp;k?. To overclock CPU speed 1 to <del class="diffchange diffchange-inline">?</del>&nbsp;20.4&nbsp;MHz, replace R07D with an 820&nbsp;? resistor. 20&nbsp;MHz is pushing the limits of what the flash chip is spec'd for, so consider instead 910&nbsp;? for <del class="diffchange diffchange-inline">?</del>&nbsp;19&nbsp;MHz, or 1&nbsp;k? for <del class="diffchange diffchange-inline">?</del>&nbsp;18&nbsp;MHz, which should hopefully be safe for all calculators.</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>Each successive CPU speed mode enables more resistors in parallel. In mode 0, only R08D is used; in mode 1, R07D is in parallel with R08D. On my (DrDnar's) calculators, I get R08D <ins class="diffchange diffchange-inline">&#8776;</ins>&nbsp;1.8&nbsp;k? and R07D <ins class="diffchange diffchange-inline">&#8776;</ins>&nbsp;1.2&nbsp;k?. To overclock CPU speed 1 to <ins class="diffchange diffchange-inline">&#8776;</ins>&nbsp;20.4&nbsp;MHz, replace R07D with an 820&nbsp;? resistor. 20&nbsp;MHz is pushing the limits of what the flash chip is spec'd for, so consider instead 910&nbsp;? for <ins class="diffchange diffchange-inline">&#8776;</ins>&nbsp;19&nbsp;MHz, or 1&nbsp;k? for <ins class="diffchange diffchange-inline">&#8776;</ins>&nbsp;18&nbsp;MHz, which should hopefully be safe for all calculators.</div></td></tr>
</table>Dr. D'narhttps://wikiti.brandonw.net/index.php?title=83Plus:Overclocking&diff=11698&oldid=prevDr. D'nar: Add specifics for overclocking2020-05-08T00:11:51Z<p>Add specifics for overclocking</p>
<table class='diff diff-contentalign-left'>
<col class='diff-marker' />
<col class='diff-content' />
<col class='diff-marker' />
<col class='diff-content' />
<tr style='vertical-align: top;'>
<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 00:11, 8 May 2020</td>
</tr><tr><td colspan="2" class="diff-lineno">Line 8:</td>
<td colspan="2" class="diff-lineno">Line 8:</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 TI-84+CSE and older TI-84+/SEs use the TA3 ASIC (port 15 reads 45h), pictured on the right. Pins 67-72 on the TA3 connect to an external RC tank circuit. The calculators have 4 CPU speed modes, which were originally supposed to be 6, 15, 20, and 25 MHz; production calculators only have 6 and 15 MHz modes. The four red pins correspond to the four CPU speed modes.</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 TI-84+CSE and older TI-84+/SEs use the TA3 ASIC (port 15 reads 45h), pictured on the right. Pins 67-72 on the TA3 connect to an external RC tank circuit. The calculators have 4 CPU speed modes, which were originally supposed to be 6, 15, 20, and 25 MHz; production calculators only have 6 and 15 MHz modes. The four red pins correspond to the four CPU speed modes.</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>To <del class="diffchange diffchange-inline">overclock </del>the TA3, add resistors on pins 70 and 71. The calculator seems unstable above 22 MHz, which suggests that TI didn't implement the 20 MHz mode due to resistors not being accurate enough (some calcs might get a particularly bad resistor and end up being more like 23 MHz for the resistor value that should give 20 MHz).</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>To <ins class="diffchange diffchange-inline">enable speeds 02 and 03 on </ins>the TA3, add resistors on pins 70 and 71. The calculator seems unstable above 22<ins class="diffchange diffchange-inline">&nbsp;</ins>MHz, which suggests that TI didn't implement the 20<ins class="diffchange diffchange-inline">&nbsp;</ins>MHz mode due to resistors not being accurate enough (some calcs might get a particularly bad resistor and end up being more like 23<ins class="diffchange diffchange-inline">&nbsp;</ins>MHz for the resistor value that should give 20<ins class="diffchange diffchange-inline">&nbsp;</ins>MHz)<ins class="diffchange diffchange-inline">. The TA1 ASIC is a reduced pin count design and appears to lack the pins for the 02 and 03 CPU modes</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;"></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>[[File:TA1 ASIC overclock.jpg|350px|thumb|right|Image of the TA1 ASIC highlighting the relevant pins. Note the silk-screened pin 51 label.]]</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>[[File:TA1 ASIC overclock.jpg|350px|thumb|right|Image of the TA1 ASIC highlighting the relevant pins. Note the silk-screened pin 51 label.]]</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><del class="diffchange diffchange-inline">The TA1 ASIC </del>is <del class="diffchange diffchange-inline">a reduced pin count design </del>and <del class="diffchange diffchange-inline">appears to lack the pins for the 02 and 03 CPU modes</del>. To overclock <del class="diffchange diffchange-inline">the TA1, change the resistors connected </del>to <del class="diffchange diffchange-inline">ASIC pins 53 and 54</del>. <del class="diffchange diffchange-inline">On the board in the picture</del>, <del class="diffchange diffchange-inline">the resistors are labeled </del>R07D <del class="diffchange diffchange-inline">and R08D</del>. <del class="diffchange diffchange-inline">Labeling and positioning may </del>be <del class="diffchange diffchange-inline">different on later devices</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><ins class="diffchange diffchange-inline">Each successive CPU speed mode enables more resistors in parallel. In mode 0, only R08D </ins>is <ins class="diffchange diffchange-inline">used; in mode 1, R07D is in parallel with R08D. On my (DrDnar's) calculators, I get R08D ?&nbsp;1.8&nbsp;k? </ins>and <ins class="diffchange diffchange-inline">R07D ?&nbsp;1.2&nbsp;k?</ins>. To overclock <ins class="diffchange diffchange-inline">CPU speed 1 </ins>to <ins class="diffchange diffchange-inline">?&nbsp;20</ins>.<ins class="diffchange diffchange-inline">4&nbsp;MHz</ins>, <ins class="diffchange diffchange-inline">replace </ins>R07D <ins class="diffchange diffchange-inline">with an 820&nbsp;? resistor</ins>. <ins class="diffchange diffchange-inline">20&nbsp;MHz is pushing the limits of what the flash chip is spec'd for, so consider instead 910&nbsp;? for ?&nbsp;19&nbsp;MHz, or 1&nbsp;k? for ?&nbsp;18&nbsp;MHz, which should hopefully </ins>be <ins class="diffchange diffchange-inline">safe for all calculators</ins>.</div></td></tr>
</table>Dr. D'narhttps://wikiti.brandonw.net/index.php?title=83Plus:Overclocking&diff=11697&oldid=prevDr. D'nar: Add information for the TA1 ASIC.2020-05-06T23:03:24Z<p>Add information for the TA1 ASIC.</p>
<table class='diff diff-contentalign-left'>
<col class='diff-marker' />
<col class='diff-content' />
<col class='diff-marker' />
<col class='diff-content' />
<tr style='vertical-align: top;'>
<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 23:03, 6 May 2020</td>
</tr><tr><td colspan="2" class="diff-lineno">Line 6:</td>
<td colspan="2" class="diff-lineno">Line 6:</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>[[File:TA3 ASIC overclock.jpg|350px|thumb|right|Image of the TA3 ASIC highlighting the relevant pins. Note the silk-screened pin 1 label and the filled circle on the upper-left of the ASIC.]]</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>[[File:TA3 ASIC overclock.jpg|350px|thumb|right|Image of the TA3 ASIC highlighting the relevant pins. Note the silk-screened pin 1 label and the filled circle on the upper-left of the ASIC.]]</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>The TI-84+CSE and older TI-84+/SEs use the TA3 ASIC (port 15 reads 45h), pictured on the right. Pins 67-72 on the TA3 connect to an external RC tank circuit. The calculators have 4 CPU speed modes, which were originally supposed to be 6, 15, 20, and 25 MHz; production calculators only have 6 and 15 MHz modes. The four red pins correspond to the four CPU speed modes. <del class="diffchange diffchange-inline">(It is unknown if the TA1 ASIC used on newer TI-84+/SEs also have four external pins for CPU speed control.)</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>The TI-84+CSE and older TI-84+/SEs use the TA3 ASIC (port 15 reads 45h), pictured on the right. Pins 67-72 on the TA3 connect to an external RC tank circuit. The calculators have 4 CPU speed modes, which were originally supposed to be 6, 15, 20, and 25 MHz; production calculators only have 6 and 15 MHz modes. The four red pins correspond to the four CPU speed modes.</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>To overclock the <del class="diffchange diffchange-inline">calculator</del>, add resistors on pins 70 and 71. The calculator seems unstable above 22 MHz, which suggests that TI didn't implement the 20 MHz mode due to resistors not being accurate enough (some calcs might get a particularly bad resistor and end up being more like 23 MHz for the resistor value that should give 20 MHz).</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>To overclock the <ins class="diffchange diffchange-inline">TA3</ins>, add resistors on pins 70 and 71. The calculator seems unstable above 22 MHz, which suggests that TI didn't implement the 20 MHz mode due to resistors not being accurate enough (some calcs might get a particularly bad resistor and end up being more like 23 MHz for the resistor value that should give 20 MHz)<ins class="diffchange diffchange-inline">.</ins></div></td></tr>
<tr><td colspan="2"> </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> </div></td></tr>
<tr><td colspan="2"> </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><ins class="diffchange diffchange-inline">[[File:TA1 ASIC overclock.jpg|350px|thumb|right|Image of the TA1 ASIC highlighting the relevant pins. Note the silk-screened pin 51 label.]]</ins></div></td></tr>
<tr><td colspan="2"> </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> </div></td></tr>
<tr><td colspan="2"> </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><ins class="diffchange diffchange-inline">The TA1 ASIC is a reduced pin count design and appears to lack the pins for the 02 and 03 CPU modes. To overclock the TA1, change the resistors connected to ASIC pins 53 and 54. On the board in the picture, the resistors are labeled R07D and R08D. Labeling and positioning may be different on later devices</ins>.</div></td></tr>
</table>Dr. D'narhttps://wikiti.brandonw.net/index.php?title=83Plus:Overclocking&diff=10341&oldid=prevDr. D'nar: Oops. Fixed category2014-10-22T00:27:41Z<p>Oops. Fixed category</p>
<table class='diff diff-contentalign-left'>
<col class='diff-marker' />
<col class='diff-content' />
<col class='diff-marker' />
<col class='diff-content' />
<tr style='vertical-align: top;'>
<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 00:27, 22 October 2014</td>
</tr><tr><td colspan="2" class="diff-lineno">Line 1:</td>
<td colspan="2" class="diff-lineno">Line 1:</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>[[Category:83Plus:General Hardware Information|<del class="diffchange diffchange-inline">Memory Mapping</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>[[Category:83Plus:General Hardware Information|<ins class="diffchange diffchange-inline">Overclocking</ins>]]</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>[[Category:84PCSE:General Hardware Information|<del class="diffchange diffchange-inline">Memory Mapping</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>[[Category:84PCSE:General Hardware Information|<ins class="diffchange diffchange-inline">Overclocking</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;"></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>The TI-83+SE, TI-84+, TI-84+SE, and TI-84+CSE can all be overclocked. The TI-83+SE had special solder pads to enable overclocking, but the TI-84+ series lacks them.  </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 TI-83+SE, TI-84+, TI-84+SE, and TI-84+CSE can all be overclocked. The TI-83+SE had special solder pads to enable overclocking, but the TI-84+ series lacks them.  </div></td></tr>
</table>Dr. D'narhttps://wikiti.brandonw.net/index.php?title=83Plus:Overclocking&diff=10337&oldid=prevDr. D'nar: Page creation2014-10-21T23:54:43Z<p>Page creation</p>
<p><b>New page</b></p><div>[[Category:83Plus:General Hardware Information|Memory Mapping]]<br />
[[Category:84PCSE:General Hardware Information|Memory Mapping]]<br />
<br />
The TI-83+SE, TI-84+, TI-84+SE, and TI-84+CSE can all be overclocked. The TI-83+SE had special solder pads to enable overclocking, but the TI-84+ series lacks them. <br />
<br />
[[File:TA3 ASIC overclock.jpg|350px|thumb|right|Image of the TA3 ASIC highlighting the relevant pins. Note the silk-screened pin 1 label and the filled circle on the upper-left of the ASIC.]]<br />
<br />
The TI-84+CSE and older TI-84+/SEs use the TA3 ASIC (port 15 reads 45h), pictured on the right. Pins 67-72 on the TA3 connect to an external RC tank circuit. The calculators have 4 CPU speed modes, which were originally supposed to be 6, 15, 20, and 25 MHz; production calculators only have 6 and 15 MHz modes. The four red pins correspond to the four CPU speed modes. (It is unknown if the TA1 ASIC used on newer TI-84+/SEs also have four external pins for CPU speed control.)<br />
<br />
To overclock the calculator, add resistors on pins 70 and 71. The calculator seems unstable above 22 MHz, which suggests that TI didn't implement the 20 MHz mode due to resistors not being accurate enough (some calcs might get a particularly bad resistor and end up being more like 23 MHz for the resistor value that should give 20 MHz).</div>Dr. D'nar