I'm trying to use the INI instruction. Here is what I could find in AsmGuru: Mnemonic SZHPNC Description Notes INI ?*??1- Input and Increment (HL)=(C),HL=HL+1,B=B-1 All tutorials Copyright (c) James Matthews 1998, unless specified. What does mean the (HL)=(C) ? What's the difference with (HL)=C ? thanks, Jean Get your FREE Email at http://mailcity.lycos.com Get your PERSONALIZED START PAGE at http://my.lycos.com