|Fast facts on Sega G80|
|Main processor: Zilog Z80|
The Sega G80 is an arcade system produced by Sega in 1981. It can be considered a successor to the Sega VIC Dual system, and was Sega's arcade platform of choice before the release of the Sega System 1.
The G80 was designed to be a more versatile system than those seen in arcade cabinets of the past. Rather than rely on bespoke cabinet designs for each game, Sega opted for a more cost-effective "Convert-a-Game" system (as it was marketed in the US), in which games housed on CPU boards could be easily swapped by arcade operators. The G80 system consisted of a card cage with a 6 slot backplane that could be populated in different game configurations from a selection of 10+ different pluggable boards, allowing it to be configured it as either a raster system if a raster video board was inserted, or a vector system that could display color vector graphics.
The G80 gets its name from its Z80 CPU which was coupled with a custom security chip to prevent operators from abusing the swappable system. The security chip would obfuscate the "ld (address),a" instruction (opcode 32h) differently based on the security chip installed — an early form of copy protection. The mangling algorithms are rather complicated, and differ from security chip to security chip.
The Sega G80 platform provided a basis for many reasonably successful vector-based games from the company, some of which, such as Space Fury, Tac/Scan, and, perhaps most famously, Star Trek: Strategic Operations Simulator, saw home console/computer ports.
|Sega Arcade Boards|
|Originating in Arcades|
|Fonz||Galaxian||Zaxxon||Appoooh||X Board||Model 2||Hikaru||Atomiswave|
|Blockade||G80||Hang-On / Space Harrier||Model 1||H1||Model 3||NAOMI 2|
|VIC Dual||System 1||System 24||NAOMI|
|VCO Object||LaserDisc||System SP|
|System 2||System 18|
|Based on Consumer Hardware|
|SG-1000||System E||System C||Triforce||Europa-R||RingEdge 2|
|Mega-Tech System||Sega Titan Video||Chihiro||Nu|
|Hardware Series / Generations|
|Electro-mechanical systems||Sega System series||Sega NAOMI series|
|Discrete logic systems||Super Scaler series||Post-NAOMI systems|
|Pre-System boards||Sega Model series|