$D7B4/55220:   OPEN command, secondary addr 15

Jump from $C15D:

D7B4: A5 83     LDA $83         ; secondary address
D7B6: 8D 4C 02  STA $024C
D7B9: 20 B3 C2  JSR $C2B3       ; get line length, erase flags
D7BC: 8E 2A 02  STX $022A
D7BF: AE 00 02  LDX $0200       ; first character from buffer
D7C2: AD 4C 02  LDA $024C       ; secondary address
D7C5: D0 2C     BNE $D7F3       ; not equal 0 (LOAD)?

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