         .OUTPI ALFRES
         .ENTRY ZERBUF
         .VIRT8 ZPAG
ZERBUF   LDA ADR
         CLC
         ADC LEN
         STA ZPAG
         LDA ADR+1
         ADC LEN+1
         STA ZPAG+1
         LDX #2
         BNE ZER003
ZER001   LDY #0
         TYA
         STA (ZPAG),Y
         INC ZPAG
         BNE ZER002
         INC ZPAG+1
ZER002   DEX
         BMI ZER004
ZER003   LDA ZPAG+1
         CMP OUTBUF+1
         BCC ZER001
         LDA ZPAG
         CMP OUTBUF
         BCC ZER001
ZER004   RTS
