   BIOS' SCPH-7000 (CRC32: EC541CD0)
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1)   

RAM

80030750 12 80 04 3c lui    a0,0x8012
80030754 07 80 05 3c lui    a1,0x8007
80030758 08 ba a5 24 addiu  a1,a1,-0x45f8      ;   BIOS
8003075c 60 a0 01 0c jal    0x80068180
80030760 28 40 84 24 addiu  a0,a0,0x4028       ;   
80030764 05 00 40 14 bne    v0,zero,0x8003077c ;  ;   "bne zero,zero,8003077c" ; opcode 05 00 00 14
80030768 00 00 00 00 nop

BIOS patch
Offset: 0x????? 0x40 -> 0x00
 ,      
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2)   

RAM

8004bb70 00 00 22 82 lb     v0,0x0(s1)         ;   BIOS
8004bb74 00 00 03 82 lb     v1,0x0(s0)         ;  c 
8004bb78 01 00 31 26 addiu  s1,s1,0x1
8004bb7c 06 00 62 10 beq    v1,v0,0x8004bb98   ;  ;   "beq zero,zero,8004bb98" ; opcode 06 00 00 10
8004bb80 01 00 10 26 addiu  s0,s0,0x1

BIOS patch
Offset: 0x????? 0x62 -> 0x00
 ,      
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........ .. .. .. .. ..... ................
801c20f0 00 00 a0 ac sw    zero,0x0(a1)
801c20f4 04 00 a5 20 addi  a1,a1,0x4
801c20f8 fd ff 85 14 bne   a0,a1,0x801c20f0
801c20fc 00 00 00 00 nop                       ; 05 80 14 3c lui s4,0x8005 - ..    
801c2100 a0 00 0a 24 li    t2,0xa0             ;                             ,    
801c2104 44 00 09 24 li    t1,0x44
801c2108 09 f8 40 01 jalr  t2
801c210c 00 00 00 00 nop                       ; 7e bb 80 a2 sb zero,-0x4482(s4) -   
801c2110 25 f8 17 00 or    ra,zero,s7
801c2114 00 c0 00 08 j     0x80030000
801c2118 00 00 00 00 nop                       ; 66 07 c0 a1 sb zero,0x766(t6) -   
........ .. .. .. .. ..... ................

BIOS patch
Offset: 0x4A148 0x00000000 -> 0x0580143C
Offset: 0x4A158 0x00000000 -> 0x7EBB80A2
Offset: 0x4A164 0x00000000 -> 0x6607C0A1
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brill 2019 (:
