I just got a ZX-81 kit (unassembled). I didn't know this before, but the ZX uses a custom 40-pin IC to perform certain I/O functions. Is this chip truly "custom" or is it a relabeled Z80 support chip? Thanks. Rich Cini/WUGNET &lt;nospam_rcini(a)msn.com&gt; - ClubWin/CW6 - MCP Windows 95/Windows Networking - Preserver of "classic" computers <<<< ========== reply separator ========== >>>>>