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dev doc: Documented BIO2 package dumps used for debugging
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doc/dev/acio-bio2-iidx-package-dump.md
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doc/dev/acio-bio2-iidx-package-dump.md
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# ACIO BIO2 IIDX package dump
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Package dump excerpt of the init sequence of a original Konami IIDX BIO2 with sub IO connected.
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This was used to identify a missing piece of information that needs to be communicated to the BIO2
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for IIDX to initialize the sub IO correctly.
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The dump was cut off after two polls as the sequence just keeps on repeating from that point on.
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## Findings for problem to solve
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With the previous implemention of the BIO2 driver, which was created off references of SDVX KFCA,
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a BIO2 used with IIDX and the sub IO (to upgrade older C02, IO2 cabinets) connected didn't
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initialize properly. This resulted in no inputs/outputs other than 14 keys working.
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The problem identified was a different byte, exact meaning not known, that is sent in
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[exchange 4](#exchange-4-ac-io-cmd-clear). Instead of `0x3B` from the SDVX KFCA based
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implementation, it needs to be set to `0x2D`.
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## Exchange 1: AC_IO_CMD_ASSIGN_ADDRS
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### Write
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```text
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AA 00 00 01 00 01 00 02
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AA: SOF
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00: addr
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0001: AC_IO_CMD_ASSIGN_ADDRS
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00: seq_no
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01: nbytes
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data: 00
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02: checksum
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```
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### Read
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```
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AA AA 00 00 01 00 01 01 03
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AA: SOF
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AA: SOF
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00: addr
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0001: addr
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00: seq_no
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01: nbytes
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01: data
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03: checksum
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```
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## Exchange 2: AC_IO_CMD_GET_VERSION
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### Write
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```
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AA 01 00 02 00 00 03
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AA: SOF
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01: addr, node 1
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0002: AC_IO_CMD_GET_VERSION
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00: seq_no
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00: nbytes
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03: checksum
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```
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### Read
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```
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AA AA 81 00 02 00 2C 0D 06 00 00 ...
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AA: SOF
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AA: SOF
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81: Response flag + node 1
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0002: AC_IO_CMD_GET_VERSION
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00: seq_no
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2C: nbytes
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0D 06 00 00 ...: data
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XX: checksum
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```
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## Exchange 3: AC_IO_CMD_START_UP
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### Write
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```
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AA 01 00 03 00 00 04
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AA: SOF
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01: addr
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0003: AC_IO_CMD_START_UP
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00: seq_no
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00: nbytes
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04: checksum
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```
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### Read
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```
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AA AA 81 00 03 00 01 00 85
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AA: SOF
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AA: SOF
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81: Response flag + node 1
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0003: AC_IO_CMD_START_UP
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00: seq_no
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01: nbytes
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00: data
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85: checksum
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```
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## Exchange 4: AC_IO_CMD_CLEAR
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### Write
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```
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AA 01 01 00 00 01 2D 30
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AA: SOF
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01: addr
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0100: AC_IO_CMD_CLEAR
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00: seq_no
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01: nbytes
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2D: data
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30: checksum
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```
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### Read
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```
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AA AA 81 01 00 00 01 00 83
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AA: SOF
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AA: SOF
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81: Response flag + node 1
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0100: AC_IO_CMD_CLEAR
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00: seq_no
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01: nbytes
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00: data
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83: checksum
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```
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## Exchange 5: BIO2_BI2A_CMD_WATCHDOG
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### Write
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```
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AA 01 01 20 00 02 00 00 24
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AA: SOF
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01: addr
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0120: BIO2_BI2A_CMD_WATCHDOG
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00: seq_no
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02: nbytes
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00 00: data
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24: checksum
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```
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### Read
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```
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AA AA 81 01 20 00 01 00 A3
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AA: SOF
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AA: SOF
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81: Response flag + node 1
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0120: BIO2_BI2A_CMD_WATCHDOG
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00: seq_no
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01: nbytes
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00: data
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A3: checksum
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```
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## Exchange 6: BIO2_BI2A_CMD_POLL
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### Write
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```
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AA 01 01 52 00 30 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 84
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AA: SOF
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01: addr
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0152: BIO2_BI2A_CMD_POLL
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00: seq_no
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30: nbtes
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...: data
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84: checksum
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```
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### Read
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```
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AA AA 81 01 52 00 2E 00 00 B0 00 F0 00 F0 F0 00 00 00 00 00 02 00 5F 11 FF 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 F3
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AA: SOF
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AA: SOF
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81: Response flag + node 1
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0152: BIO2_BI2A_CMD_POLL
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00: seq_no
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2E: nbytes
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...: data
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F3: checksum
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```
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## Exchange 7: BIO2_BI2A_CMD_POLL
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### Write
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```
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AA 01 01 52 00 30 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 84
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```
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### Read
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```
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AA AA 81 01 52 00 2E 00 00 B0 00 F0 00 F0 F0 00 00 00 00 00 02 00 64 11 FF 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 F8
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```
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