COP command fix for minor heatbrl regression; misc. notes (nw)

src/mame/machine/seibucop/seibucop.cpp

@@ -70,6 +70,7 @@
 013F66: 1140 003D                  move.b  D0, ($3d,A0)         // move angle value to [0x3d]
 013F6A: 4E75                       rts
 	Zero Team
+	- Some faulty collision detection, e.g. crate in front of aquarium in stage 1
 	- Bird Boss jumps to wrong direction
 	  the sequence called is: 
 	  write to reg 4 then execute 0xfc84 and 0xf790, finally reads the distance.

src/mame/machine/seibucop/seibucop_cmd.hxx

@@ -153,6 +153,8 @@ void raiden2cop_device::execute_338e(int offset, UINT16 data)
 	int dx = m_host_space->read_dword(cop_regs[1] + 4) - m_host_space->read_dword(cop_regs[0] + 4);
 	int dy = m_host_space->read_dword(cop_regs[1] + 8) - m_host_space->read_dword(cop_regs[0] + 8);
 
+	cop_status = 7;
+
 	if (!dy) {
 		cop_status |= 0x8000;
 		cop_angle = 0;

src/mame/machine/seicop.cpp

@@ -6,7 +6,7 @@
     - Seibu Cup Soccer (bootleg)
 
   Notice that only the bare minimum is supported, which is what the bootleg device actually 
-  do.
+  provides. Unlike the original device and many other Seibu customs, it has no DMA.
   Apparently it's an Actel PL84c FPGA programmed to be a Seibu COP clone. 
   The internal operations are actually loaded via the ROMs, we use the original algorithm 
   for the trigger until we find the proper hookup.