blog:ql_dev2

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Next revision		 Previous revision
blog:ql_dev2 [2021/12/14 21:01] – created johnblog:ql_dev2 [2021/12/14 21:09] (current) – john
Line 7: Line 7:
 In Mode 4 (512x256 4 colour) the memory is laid out in byte pairs (or words) In Mode 4 (512x256 4 colour) the memory is laid out in byte pairs (or words)
  
-//Red// byte    | //Green// byte +<code> 
-7 6 5 4 3 2 1 0 | 7 6 5 4 3 2 1 0+Red byte        | Green byte
 0 0 0 0 0 0 0 0 | 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 | 0 0 0 0 0 0 0 0
 +</code>
  
-Those 16 bits set a series of **8** pixels. The values of the //Red// and //Green// byte are AND-ed to get the final colour:+Those 16 bits set a series of **8** contiguous horizontal pixels. The values of the //Red// and //Green// byte are AND-ed to get the final colour:
  
 +<code>
 Red | Green | Result Red | Green | Result
 1   | 0     | Red 1   | 0     | Red
Line 18: Line 20:
 1   | 1     | White 1   | 1     | White
 0   | 0     | Black 0   | 0     | Black
 +</code>
 +
 +Example 1:
 +<code>
 +0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1
 +</code>
 +
 +...would draw an 8 pixel horizontal line in //Green//.
 +
 +Example 2:
 +<code>
 +1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
 +</code>
 +
 +...would draw an 8 pixel horizontal line in //White//.
 +
 +Example 3:
 +<code>
 +1 0 1 0 1 0 1 0 0 1 0 1 0 1 0 1
 +</code>
 +
 +...would draw 8 alternating pixels of //Red// and //Green//.
  
  • blog/ql_dev2.1639515713.txt.gz
  • Last modified: 2021/12/14 21:01
  • by john