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MODE &64 - Revision history
2024-03-28T18:54:24Z
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Jgharston: Initial page.
2020-02-17T20:24:38Z
<p>Initial page.</p>
<p><b>New page</b></p><div>[[Category:Display]]<br />
{| style="vertical-align:top;"<br />
| <br />
'''MODE 100''' is medium-resolution screen [[MODE]] supported by the VideoNuLA<br />
hardware, selectable with the VideoNuLA ROM.<br />
<br />
The MODE 100 code adapts the [[MODE 4]] screen, adding extra colour bits to provide a<br />
5-colour version of MODE 4, 40 &times; 32 characters in 5 colours.<br />
<br />
{| class="wikitable" style="text-align:left"<br />
|+'MODE 100 (&60+4)'<br />
| Type<br />
| colspan="2" | Bitmapped<br />
|- style="vertical-align:top"<br />
| rowspan="2" | Resolution<br />
| Text<br />
| 40 &times; 32 characters<br />
|- style="vertical-align:top"<br />
| Graphics<br />
| <!-- text only --><br />
|- style="vertical-align:top"<br />
| Character size<br />
| colspan="2" | 6 &times; 8 pixels<br />
|- style="vertical-align:top"<br />
| Pixel aspect<br />
| colspan="2" | 1:1 (square)<br />
|- style="vertical-align:top"<br />
| Bits per pixel<br />
| 4<br />
|- style="vertical-align:top"<br />
| rowspan="6" | Default palette<br />
! Logical colour<br />
! Actual colour<br />
|- style="vertical-align:top"<br />
| 0<br />
| 0 (black)<br />
|- style="vertical-align:top"<br />
| 1<br />
| 1 (red)<br />
|- style="vertical-align:top"<br />
| 2<br />
| 2 (green)<br />
|- style="vertical-align:top"<br />
| 3<br />
| 3 (yellow)<br />
|- style="vertical-align:top"<br />
| 4<br />
| 7 (white)<br />
|- style="vertical-align:top"<br />
| rowspan="2" | Memory<br />
| allocated<br />
| 10240 bytes<br />
|- style="vertical-align:top"<br />
| on screen<br />
| 10240 bytes<br />
|- style="vertical-align:top"<br />
| rowspan="1" | Address range<br />
| Model B ''etc.''<br />
| &5800..&7FFF<br />
|- style="vertical-align:top"<br />
| rowspan="3" | Configuration<br />
| [[Video ULA]] control register<br />
| <!-- &44 --><br />
|- style="vertical-align:top"<br />
| Video ULA palette register file<br />
| <!-- &07 &17 &26 &36 &47 &57 &66 &76<br> &84 &94 &A0 &B0 &C4 &D4 &E0 &F0 --><br />
|- style="vertical-align:top"<br />
| [[CRTC]] register file<br />
| <!-- &3F &28 &31 &24 &26 &00<br> &20 &22 &01 &07 &67 &08 --><br />
|}<br />
<br />
| <img width="320" src="http://mdfs.net/Info/Comp/BBC/Display/VideoNuLA/img/MODE100.gif"><br />
<!-- can't get this image to align to the top --><br />
|}<br />
<br />
==References==<br />
<references/><br />
{{MODE}}<br />
[[User:Jgharston|Jgharston]] ([[User talk:Jgharston|talk]]) 21:24, 17 February 2020 (CET)</div>
Jgharston