Add note on GP0(02h) height masking

2020-09-25 19:26:02 -07:00 · 2020-09-25 19:26:02 -07:00 · 5aaca8a160
parent 9c9ef0c548
commit 5aaca8a160
1 changed files with 2 additions and 0 deletions
--- a/graphicsprocessingunitgpu.md
+++ b/graphicsprocessingunitgpu.md
@ -502,6 +502,8 @@ Fill does NOT occur when Xsiz=0 or Ysiz=0 (unlike as for Copy commands).
 Xsiz=400h works only indirectly: Param=400h is handled as Xsiz=0, however,
 Param=3F1h..3FFh is rounded-up and handled as Xsiz=400h.<br/>

+Note that because of the height (Ysiz) masking, a maximum of 511 rows can be filled in a single command. Calling a fill with a full VRAM height of 512 rows will be ineffective as the height will be masked to 0.
+
 #### Masking for COPY Commands parameters
 ```
  Xpos=(Xpos AND 3FFh)                       ;range 0..3FFh