$CB5C/52060:   Perform [U] - User command

CB5C: AC 01 02  LDY $0201       ; second char
CB5F: C0 30     CPY #$30        ; '0'
CB61: D0 09     BNE $CB6C       ; no

Jump from $EBBC:

CB63: A9 EA     LDA #$EA
CB65: 85 6B     STA $6B         ; pointer to table of user-addresses
CB67: A9 FF     LDA #$FF        ; $FFEA
CB69: 85 6C     STA $6C
CB6B: 60        RTS

Jump from $CB61:

CB6C: 20 72 CB  JSR $CB72
CB6F: 4C 94 C1  JMP $C194       ; done, prepare error message

Jump from $CB6C:

CB72: 88        DEY
CB73: 98        TYA
CB74: 29 0F     AND #$0F        ; number
CB76: 0A        ASL             ; times 2
CB77: A8        TAY
CB78: B1 6B     LDA ($6B),Y     ; as pointer in table
CB7A: 85 75     STA $75
CB7C: C8        INY             ; address at $75/$76
CB7D: B1 6B     LDA ($6B),Y
CB7F: 85 76     STA $76
CB81: 6C 75 00  JMP ($0075)     ; execute function

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