https://wiki.specnext.dev/index.php?action=history&feed=atom&title=Memory_Mapping_Mode_Register 2026-05-09T08:50:29Z Revision history for this page on the wiki MediaWiki 1.43.5 https://wiki.specnext.dev/index.php?title=Memory_Mapping_Mode_Register&diff=41272&oldid=prev 2025-10-14T12:33:23Z

<p>Xalior moved page <a href="/Memory_Mapping_Mode" class="mw-redirect" title="Memory Mapping Mode">Memory Mapping Mode</a> to <a href="/Memory_Mapping_Mode_Register" title="Memory Mapping Mode Register">Memory Mapping Mode Register</a>: match formal nextreg.txt name</p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en-GB"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 13:33, 14 October 2025</td> </tr><tr><td colspan="4" class="diff-notice" lang="en-GB"><div class="mw-diff-empty">(No difference)</div> </td></tr> <!-- diff cache key specnext_wiki:diff:1.41:old-12307:rev-41272 --> </table>

Xalior https://wiki.specnext.dev/index.php?title=Memory_Mapping_Mode_Register&diff=12307&oldid=prev 2024-11-03T11:53:18Z

<p>updated to 78a6ee50</p> <p><b>New page</b></p><div>{{NextRegister<br /> |Number=$8F<br /> |Readable=Yes<br /> |Writable=Yes<br /> |ShortDesc=Select memory mapping mode<br /> }}<br /> bits 7:2 = Reserved, must be zero<br /> bits 1:0 = Mapping mode applied (hard reset = 0)<br /> 00 = Standard ZX 128k +3<br /> 01 = Reserved<br /> 10 = Pentagon 512K<br /> 11 = Pentagon 1024K (limited to 768K on 1MB machines)<br /> <br /> * Standard ZX 128K +3 = principally ports 0x7ffd, 0xdffd, 0x1ffd<br /> * Pentagon 512K = principally port 0x7ffd<br /> * Pentagon 1024K = principally ports 0x7ffd, 0xeff7<br /> ** The mapping modes affect how ports 0x7ffd, 0xdffd, 0x1ffd and 0xeff7 carry out memory paging, see ports.txt</div>

Sol HSA