Apple-2-SW/apple2_hgr_font_tutorial
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Fix flip bits not marked up

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michaelangel007 2016-01-09 12:34:55 -08:00
parent 6bab23c16a
commit 9a50be6226
1 changed files with 5 additions and 5 deletions
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@ -163,26 +163,26 @@ Third, the video scanner for HGR mode scans bits in reverse. :-/ This means that
2900:20
2D00:10
We would only get:
We would only get:
* 3 scanlines intead of the expected 4 (see the next point), and
* the image would be flipped along the left-right (X axis) like this: `/` !!
* the image would be flipped along the left-right (X axis) like this: `/`
On the Apple we need to flip each byte:
On the Apple we need to flip each byte:
%0000_0001 = $01
%0000_0010 = $02
%0000_0100 = $04
%0000_1000 = $08
Enter in:
Enter in:
2200:1
2600:2
2A00:4
2E00:8
And we see the correct: `\`
And we see the correct: `\`
### Half-pixel shift