Changes
8255
,[[File:8255 Block Diagram.png]]
= Amstrad ASIC PPI =
*The 8255 PPI is not emulated by the Pre-ASIC. These CPC’s have a real PPI chip and therefore behave like the first generation of CPC’s.
*The ASIC PPI does not support Group Modes other than Groupe Mode 0.
*On a real PPI chip, when the PPI control register is used (with bit7=1) to configure the ports, all the ports are reset to 0. The ASIC poorly emulates the PPI and does not reset these ports.
= Resources =
