More latch fixes and fix for old savestates

zsnes/src/cpu/execute.asm

@@ -104,6 +104,7 @@ EXTSYM JoyRead,ChatType2,chatstrR2,chatstrR3,chatstrR4,chatstrR5
 EXTSYM chatRTL2,chatRTL3,chatRTL4,chatRTL5
 EXTSYM NetLoadState
 EXTSYM ProcessMovies
+EXTSYM ioportval
 EXTSYM C4VBlank
 EXTSYM dsp1teststuff
 EXTSYM ReturnFromSPCStall,SPCStallSetting,cycpb268,cycpb358,HIRQSkip,scanlines
@@ -1779,7 +1780,7 @@ NEWSYM stateloader
     mov edx,zsmesg
     call Read_File
     cmp byte[versn],60
-    jne near .convert
+    jb near .convert
     ; Load SPC timers
     mov ecx,8
     add dword[Totalbyteloaded],ecx
@@ -1790,6 +1791,10 @@ NEWSYM stateloader
     add dword[Totalbyteloaded],ecx
     mov edx,sndrot
     call Read_File
+    cmp byte[versn],60
+    jne .not60
+    mov byte[ioportval],0FFh
+.not60
     ; Load RAM (WRAM(128k),VRAM(64k),SRAM)
     mov ecx,65536+65536
     add dword[Totalbyteloaded],ecx

zsnes/src/cpu/regs.inc

@@ -664,7 +664,7 @@ NEWSYM SDD1BankD, db 3
 NEWSYM vramread2, db 0             ; previous character for vram read
 NEWSYM nosprincr, db 0
 NEWSYM poamaddrs, dw 0
-NEWSYM ioportval, db 0
+NEWSYM ioportval, db 255
 NEWSYM iohvlatch, db 0
 
 
@@ -738,6 +738,7 @@ NEWSYM ClearRegs
     mov word[bg2objptr],0
     mov word[bg3objptr],0
     mov word[bg4objptr],0
+    mov byte[ioportval],0FFh
     ret
 
 reg2100r:
@@ -771,7 +772,7 @@ reg2137r:
     cmp byte[iohvlatch],1
     je .dolatch
     test byte[ioportval],80h
-    jnz .nolatch
+    jz .nolatch
 .dolatch
     xor ebx,ebx
     mov bl,[cycpl]
@@ -801,7 +802,7 @@ debblah:
     cmp byte[iohvlatch],1
     je .dolatch2
     test byte[ioportval],80h
-    jnz .nolatch2
+    jz .nolatch2
 .dolatch2
     xor ebx,ebx
     mov bl,[cycpl]