Clip Window Control Register: Difference between revisions

Revision as of 13:06, 23 December 2018

Number	TBRegisterNumber::$1C
Readable	TBRegisterReadable::Yes
Writable	TBRegisterWritable::Yes
Short Description	ShortDesc::Controls (resets) the clip-window registers indices.

Write:

Bit	Function
7-3	Reserved, must be 0
2	reset the ULA/LoRes clip-window register index (by writing 1).
1	reset the Sprite clip-window register index (by writing 1).
0	reset the Layer 2 clip-window register index (by writing 1).

Read: ! Bit !! Function |- | 7-6 || Reserved |- | 5-4 || the current Layer 2 clip-window register index |- | 3-2 || the current Sprite clip-window register index |- | 1-0 || the current ULA/LoRes clip-window register index |}

Each read index maps as 0: X1, 1: X2, 2: Y1 and 3: Y2 (the same order how the coordinates are read/written to particular clip-window register).

@@ Line 6: / Line 6: @@
 }}
 {| class="wikitable"
+Write:
 ! Bit !! Function
 |-
@@ Line 17: / Line 18: @@
 |}
-Ped7g comment: it's a bit unclear what interesting info may be gained by reading this register (seems a bit useless to me). I posted question in forum and I will update the text if I will get explanation.
+Read:
+! Bit !! Function
+|-
+| 7-6 || Reserved
+|-
+| 5-4 || the current Layer 2 clip-window register index
+|-
+| 3-2 || the current Sprite clip-window register index
+|-
+| 1-0 || the current ULA/LoRes clip-window register index
+|}
+Each read index maps as 0: X1, 1: X2, 2: Y1 and 3: Y2 (the same order how the coordinates are read/written to particular clip-window register).