;; Max 1.5s
.macro time_start
    PHA
    LDA $DC08 ; Bit 0..3: Tenth seconds in BCD-format, others may be 0 or 1
    ;;;;Clear all time data and set time =1.
    AND #%11110000
    STA $DC08
    INC $DC08
    LDA $DC08
    ;;Time is only at bit 0 ..3
    AND #%00001111
    STA $f1
    PLA
.endmacro

.macro time_stop
    PHA
    LDA $DC08 ; Bit 0..3: Tenth seconds in BCD-format, others may be 0 or 1
    AND #%00001111
    SEC
    SBC $f1
    STA $f1
    PLA
.endmacro