msg0    db  "SQUELCH"

@@NOTR: test    al,SQLCH        ; Squelch byte?
        jz      @@FRAM          ; no, then it is a frame.
        and     al,00111111b    ; Leave just the count.
        push    cx              ; Save current countdown counter.
        mov     cl,al           ; get repeat count
        xor     ch,ch           ; zero high byte of CX
        mov     bx,cx           ; Repeat count in DX
        mov     al,dl           ; Repeat of previous.
        rep     stosb           ; Repeat it.
        pop     cx              ; Get back remaining count.
        sub     cx,bx           ; Less.
        jnz     @@DCMP          ; Keep going.
        jmp     @@DONE