Amstrad PCW 8256 with a CIRTECH Sprint accelerator card by Amstrad Retro Geek
-The CIRTECH Sprint accelerator card for Amstrad PCW has a 8 Mhz Z80 which replaces the original 4 Mhz Z80 inside the PCW.
Amstrad Retro Geek is showing this CIRTECH Sprint accelerator card being used on an Amstrad PCW 8256.
Youtube video