Differences

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--- ff3:ff3us:doc:snes:register [2019/08/08 02:39]
madsiur [Address Bus B Registers]
+++ ff3:ff3us:doc:snes:register [2019/08/08 02:56]
madsiur [Counter Latch]
@@ Line 827: / Line 827: @@
 [[register#Address Bus B Registers|Back to top]]
+===== PPU1 Status and Version Number =====
+<code>
+$213E r b++++ STAT77 - PPU1 Status and Version Number
+        trmuvvvv
+        t    = OBJ Time overflow  (0=Okay, 1=More than 8x34 OBJ pixels per scanline)
+        r    = OBJ Range overflow (0=Okay, 1=More than 32 OBJs per scanline)
+        m    = Master/Slave Mode (PPU1.Pin25) (0=Normal=Master)
+        u    = unused
+        vvvv = PPU1 5C77 Version Number (only version 1 exists)
+</code>
+Bit t: If more than 34 sprite-tiles (e.g. a 16x16 sprite has 2 sprite-tiles) were encountered on a single line, this flag will be set. The flag is reset at the end of V-Blank but not during forced blank.
+Bit r: If more than 32 sprites were encountered on a single line, this flag will be set. The flag is reset at the end of V-Blank but not during forced blank.
+Note that the above two flags are set whether or not OBJ are actually enabled at the time (see $212C), at the following times: bit 6 when V=OBJ.YLOC/H=OAM.INDEX*2, bit 7 when V=OBJ.YLOC+1/H=0.