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@@ -744,6 +744,17 @@ https://en.wikipedia.org/wiki/PETSCII</a> more details.
</td></tr>
<tr><td class="cmd">
+c64
+</td>
+<td class="def">
+The screen codes as used on the Commodore 64. Note these codes are different
+to PETSCII and are the values to be poked into screen memory. The lower case
+characters are the low part of the code -- these will appear onscreen either
+in upper or lower case depending on the shift mode. The upper case characters
+are either graphics characters or capital letters depending on the shift mode.
+</td></tr>
+
+<tr><td class="cmd">
zx81
</td>
<td class="def">