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Routine $0733:   Measure (current -or- next following) Sync length (in X). (~CF:=0,[$BD]=A:=6 if Sync found)

This routine waits for the next Non-SYNC, the start of the following SYNC
and counts X++ while over that SYNC mark (measure SYNC length).
CF:=0, [$BD]=A:=6 if SYNC found.


JSR from $0530:

0733: B8        CLV

JSR from $0488***:

0734: 50 FE     BVC $0734      ; wait for byte-ready

0736: 20 9C 06  JSR $069C      ; Waits for SYNC mark, CF=0 if SYNC found.
0739: B0 09     BCS $0744      ; immediate return if no SYNC found

073B: A9 06     LDA #$06
073D: 85 BD     STA $BD        ; [$BD]:=6 if SYNC found

JSR from $0754:

073F: B8        CLV

Jump from $0742:

0740: E8        INX
0741: EA        NOP
0742: 50 FC     BVC $0740      ; X++ while no byte-ready (while over SYNC)

Jump from $0739:

0744: 60        RTS

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