===== 10 SRG SIO REGISTERS | BIOS 19951204 System ROM Version 3.0 11/18/96 A
BadVaddr as the group starts: 00000480
As found: STAT 00000185 MODE 0000 CTRL 0000 MISC DFDD BAUD 0000
lw 1F801058 00000000, lw 1F80105C 0000DFDD, lhu 1F801052 FFFF, lhu 1F801056 0000
Empty RX: lbu FE lhu FFFF lw FFFF7FFF
MODE FFFF: 00FF
MODE 0: 0000
BAUD FFFF: FFFF
BAUD 1235: 1235
CTRL one bit at a time, MODE 0 then MODE 004E: CTRL, STAT, I_STAT.8
M0 bit  0: 0001 0185 0
M0 bit  1: 0002 0185 0
M0 bit  2: 0004 0185 0
M0 bit  3: 0008 0185 0
M0 bit  5: 0020 0185 0
M0 bit  7: 0000 0185 0
M0 bit  8: 0100 0185 0
M0 bit  9: 0200 0185 0
M0 bit 10: 0400 0385 1
M0 bit 11: 0800 0185 0
M0 bit 12: 1000 0385 1
M0 bit 13: 0000 0185 0
M0 bit 14: 0000 0185 0
M0 bit 15: 0000 0185 0
M1 bit  0: 0001 0185 0
M1 bit  1: 0002 0185 0
M1 bit  2: 0004 0185 0
M1 bit  3: 0008 0185 0
M1 bit  5: 0020 0185 0
M1 bit  7: 0080 0185 0
M1 bit  8: 0100 0185 0
M1 bit  9: 0200 0185 0
M1 bit 10: 0400 0385 1
M1 bit 11: 0800 0185 0
M1 bit 12: 1000 0385 1
M1 bit 13: 0000 0185 0
M1 bit 14: 0000 0185 0
M1 bit 15: 0000 0185 0
MODE 004E CTRL FFAF: 1FAF
MISC write, read with MODE 004E (8 bits) and 0042 (5 bits):
  1234: 3412 D4D2, read again D4D2
  FFFF: FFFF DFDF, read again DFDF
  0000: 0000 C0C0, read again C0C0
  A5C3: C3A5 C3C5, read again C3C5
MISC 1234 then 5000 cycles: 3412
Before reset: MODE 004E CTRL 0023 MISC 7856 BAUD 00DC STAT 0385
CTRL 0040: MODE 0000 CTRL 0000 MISC 7856 BAUD 0000 STAT 0000E185
Put back: MODE 0000 CTRL 0000 BAUD 0000 (MISC left 7856)
Done.