Z80 PIO
From CPCWiki - THE Amstrad CPC encyclopedia!
The Zilog Z80 PIO chip is a Dual 8bit I/O Port (not to be confused with the Triple 8bit 8255 PPI, which is sometimes referred to as PIO, too).
A Z80 PIO is used by ACU Real Time Clock (DIY), and Dk'tronics Real Time Clock.
