Changes
Third part: Used components:
1 -Z80-STI (or MK 3801-4)1 -SN 751891 -SN 751881 -74 LS 301 -74 LS 1381 -74 LS 201 -74 LS 041 -74 LS 321 -25pin SUB-D connector (male)1 -connector for the expansion port
[[http://www.cpcwiki.eu/index.php/File:Rs232cpc.lzh]] - All info and files on topic