Until I get the time to write a detailed article on the Jupiter Ace, here's a video I recorded about the system.
Specifications:
CPU: Zilog Z80A @ 3.25 MHz Graphics: 64x48 text mode with redefined characters providing graphics, or 256x192. Black & White display. Sound: CPU controlled & internal speaker
Memory: 1K system RAM (expandable to 49K) & 2K video RAM Software Media:Cassette.