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https://oldwiki.cpcwiki.eu/index.php?action=history&feed=atom&title=SYMBiFACE_II%3ARAM_Expansion
SYMBiFACE II:RAM Expansion - Revision history
2026-08-30T02:42:06Z
Revision history for this page on the wiki
MediaWiki 1.25.1
https://oldwiki.cpcwiki.eu/index.php?title=SYMBiFACE_II:RAM_Expansion&diff=101954&oldid=prev
TFM at 15:55, 14 July 2018
2018-07-14T15:55:08Z
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<td colspan='2' style="background-color: white; color:black; text-align: center;">Revision as of 15:55, 14 July 2018</td>
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<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:Memory <del class="diffchange diffchange-inline">Expansions</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:Memory <ins class="diffchange diffchange-inline">expansions</ins>]]</div></td></tr>
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TFM
https://oldwiki.cpcwiki.eu/index.php?title=SYMBiFACE_II:RAM_Expansion&diff=101233&oldid=prev
Arnoldemu at 10:45, 11 March 2018
2018-03-11T10:45:58Z
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<td colspan='2' style="background-color: white; color:black; text-align: center;">Revision as of 10:45, 11 March 2018</td>
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<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>[[Category:Hardware]]</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>[[Category:Hardware]]</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:<del class="diffchange diffchange-inline">RAM Expansion</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:<ins class="diffchange diffchange-inline">Memory Expansions</ins>]]</div></td></tr>
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Arnoldemu
https://oldwiki.cpcwiki.eu/index.php?title=SYMBiFACE_II:RAM_Expansion&diff=101232&oldid=prev
Arnoldemu at 10:45, 11 March 2018
2018-03-11T10:45:13Z
<p></p>
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<td colspan='2' style="background-color: white; color:black; text-align: center;">Revision as of 10:45, 11 March 2018</td>
</tr><tr><td colspan="2" class="diff-lineno" id="L20" >Line 20:</td>
<td colspan="2" class="diff-lineno">Line 20:</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>C3 therefore looks the same as C1. On fully compatible Dk'tronics ram expansions, A15 is forced to 1 to remap &c000-&4000 but the Symbiface 2 doesn't do this so this is why it works differently on a 464 compared to a 6128.</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>C3 therefore looks the same as C1. On fully compatible Dk'tronics ram expansions, A15 is forced to 1 to remap &c000-&4000 but the Symbiface 2 doesn't do this so this is why it works differently on a 464 compared to a 6128.</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>
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Arnoldemu
https://oldwiki.cpcwiki.eu/index.php?title=SYMBiFACE_II:RAM_Expansion&diff=98458&oldid=prev
Arnoldemu at 12:52, 8 August 2017
2017-08-08T12:52:23Z
<p></p>
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<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 12:52, 8 August 2017</td>
</tr><tr><td colspan="2" class="diff-lineno" id="L19" >Line 19:</td>
<td colspan="2" class="diff-lineno">Line 19:</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>  &c000-&ffff: Extra ram page (same ram page selected with 'C7')</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>  &c000-&ffff: Extra ram page (same ram page selected with 'C7')</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>C3 looks the same as C1. On fully compatible Dk'tronics ram expansions, A15 is forced to 1 to remap &c000-&4000 but the Symbiface 2 doesn't do this so this is why it works differently on a 464 compared to a 6128.</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>C3 <ins class="diffchange diffchange-inline">therefore </ins>looks the same as C1. On fully compatible Dk'tronics ram expansions, A15 is forced to 1 to remap &c000-&4000 but the Symbiface 2 doesn't do this so this is why it works differently on a 464 compared to a 6128.</div></td></tr>
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Arnoldemu
https://oldwiki.cpcwiki.eu/index.php?title=SYMBiFACE_II:RAM_Expansion&diff=98457&oldid=prev
Arnoldemu at 12:51, 8 August 2017
2017-08-08T12:51:59Z
<p></p>
<table class='diff diff-contentalign-left'>
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<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 12:51, 8 August 2017</td>
</tr><tr><td colspan="2" class="diff-lineno" id="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>On a 6128 or 6128Plus with internal memory expansion, "C3" works as expected. The PAL inside the 6128 performs the remapping of &c000 to &4000.</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>On a 6128 or 6128Plus with internal memory expansion, "C3" works as expected. The PAL inside the 6128 performs the remapping of &c000 to &4000.</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>&0000-&3fff: Main ram &0000-&3fff</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"> </ins>&0000-&3fff: Main ram &0000-&3fff</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>&4000-&7fff: Main ram &c000-&ffff</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"> </ins>&4000-&7fff: Main ram &c000-&ffff</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>&8000-&bfff: Main ram &8000-&bfff</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"> </ins>&8000-&bfff: Main ram &8000-&bfff</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>&c000-&ffff: Extra ram page (same ram page selected with 'C7')</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"> </ins>&c000-&ffff: Extra ram page (same ram page selected with 'C7')</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>On a 464/664/464Plus the result is different because it doesn't have the PAL memory mapping IC (in the case of 464Plus or Costdown 464 the PAL is not activated).</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>On a 464/664/464Plus the result is different because it doesn't have the PAL memory mapping IC (in the case of 464Plus or Costdown 464 the PAL is not activated).</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>&0000-&3fff: Main ram &0000-&3fff</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"> </ins>&0000-&3fff: Main ram &0000-&3fff</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>&4000-&7fff: Main ram &4000-&7fff</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"> </ins>&4000-&7fff: Main ram &4000-&7fff</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>&8000-&bfff: Main ram &8000-&bfff</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"> </ins>&8000-&bfff: Main ram &8000-&bfff</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>&c000-&ffff: Extra ram page (same ram page selected with 'C7')</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"> </ins>&c000-&ffff: Extra ram page (same ram page selected with 'C7')</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>C3 looks the same as C1. On fully compatible Dk'tronics ram expansions, A15 is forced to 1 to remap &c000-&4000 but the Symbiface 2 doesn't do this so this is why it works differently on a 464 compared to a 6128.</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>C3 looks the same as C1. On fully compatible Dk'tronics ram expansions, A15 is forced to 1 to remap &c000-&4000 but the Symbiface 2 doesn't do this so this is why it works differently on a 464 compared to a 6128.</div></td></tr>
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Arnoldemu
https://oldwiki.cpcwiki.eu/index.php?title=SYMBiFACE_II:RAM_Expansion&diff=95057&oldid=prev
Arnoldemu: Created page with "The RAM selection is made by writing a byte (with bit 7 and 6 set to 1) to port 7fxx. The Symbiface 2 decodes the upper 8-bits of the I/O port completely and responds to 01111..."
2016-02-06T15:44:03Z
<p>Created page with "The RAM selection is made by writing a byte (with bit 7 and 6 set to 1) to port 7fxx. The Symbiface 2 decodes the upper 8-bits of the I/O port completely and responds to 01111..."</p>
<p><b>New page</b></p><div>The RAM selection is made by writing a byte (with bit 7 and 6 set to 1) to port 7fxx.<br />
The Symbiface 2 decodes the upper 8-bits of the I/O port completely and responds to 01111111xxxxxxxx.<br />
It accepts all RAM selections from c0-ff to access a full 512KB of extra RAM.<br />
<br />
All selections except "c3" (RAM selection & 7 = 3) work as expected.<br />
<br />
On a 6128 or 6128Plus with internal memory expansion, "C3" works as expected. The PAL inside the 6128 performs the remapping of &c000 to &4000.<br />
<br />
&0000-&3fff: Main ram &0000-&3fff<br />
&4000-&7fff: Main ram &c000-&ffff<br />
&8000-&bfff: Main ram &8000-&bfff<br />
&c000-&ffff: Extra ram page (same ram page selected with 'C7')<br />
<br />
On a 464/664/464Plus the result is different because it doesn't have the PAL memory mapping IC (in the case of 464Plus or Costdown 464 the PAL is not activated).<br />
<br />
&0000-&3fff: Main ram &0000-&3fff<br />
&4000-&7fff: Main ram &4000-&7fff<br />
&8000-&bfff: Main ram &8000-&bfff<br />
&c000-&ffff: Extra ram page (same ram page selected with 'C7')<br />
<br />
C3 looks the same as C1. On fully compatible Dk'tronics ram expansions, A15 is forced to 1 to remap &c000-&4000 but the Symbiface 2 doesn't do this so this is why it works differently on a 464 compared to a 6128.</div>
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