Fixed Wordtris (reading from 002100)

Implemented William's Arcade Classic copy protection (reading from 003030)

zsnes/src/cpu/regs.inc

@@ -46,6 +46,7 @@ NEWSYM initregr
     add edi,4
     loop .loopa
     ; Set all valid register accesses
+    setreg 2100h*4,reg2100r
     setreg 2134h*4,reg2134r
     setreg 2135h*4,reg2135r
     setreg 2136h*4,reg2136r
@@ -210,6 +211,9 @@ NEWSYM initregr
     setreg 437Dh*4,reg43XXr
     setreg 437Eh*4,reg43XXr
     setreg 437Fh*4,reg43XXr
+
+    setreg 3030h*4,reg3030r
+
     cmp byte[SFXEnable],0
     je .nosfx
     call initsfxregsr
@@ -454,6 +458,11 @@ NEWSYM ClearRegs
     mov word[bg4objptr],0
     ret
 
+reg2100r:
+    mov al,[vidbright]
+    or al,[forceblnk]
+    ret
+
 ; Multiply Result Low
 reg2134r:
     checkmultchange
@@ -1074,6 +1083,10 @@ reg43XXr:
     mov al,[dmadata+ebx]
     ret
 
+reg3030r:
+    mov al,0FFh
+    ret
+
 regINVALID:     ; Invalid Register
     xor al,al
 ;    mov al,30h