Amstrad Power presents Universal Basic Library (UBL) by Orac81 which is a basic library for Amstrad CPC but also for C64, VIC-20, C16, PET, DOS QBasic, Apple II, Dragon 32, BBC Micro, ZX-Spectrum, MSX, TRS-80, Exidy Sorcerer and Ohio Superboard. UBL will use the lines 1 to 49 (fast function) and 9500-9999 (heavy functions), you code will then use lines 50 to 9499.

You can download a .DSK compiled by shacpc with examples programs using UBL.