Poly Play

Poly Play ran on a U880, a clone of the Zilog Z80 CPU, which was clocked at 2.457600 MHz and a custom sound chip. Its display ran at a resolution of 512*256 at 50 Hz and supported a palette of ten colours, though it could also use coloured overlays. The machine's coin slot was designed for 50 Pfennig, but it was flawed - the pressure sensor could be deceived by pressing a 1-Pfennig coin very sharply into the top of the slot. However, this was largely tolerated because the machine was not a capitalistic commercial venture, but a state-owned product found predominantly in FDGB holiday homes, youth hostels and non-profit clubs. The machine ran with a deactivated coin slot in many youth clubs. However, the free play often caused large crowds to form around it, which incited their reactivation.

Source: Wikipedia, "[en.wikipedia.org/wiki/Poly_Play Poly Play]", available under the CC-BY-SA License.