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Routine $037F:   Decrypt code area [$0420-$046D] (bit shift), [$79]:=-3 (#params to copy in $0587 routine).

JSR from $078B, Jump from $0383:

037F: 3E 20 04  ROL $0420,X    ; Bit shift
0382: CA        DEX
0383: 10 FA     BPL $037F

0385: CA        DEX
0386: CA        DEX
0387: 86 79     STX $79        ; Set number of parameters to copy in $0587 routine (negative, usually $FD=-3)
0389: 60        RTS

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