Atari Games · 1984 · 1984 – 1987
CPU: Motorola 68010 @ 7.159 MHz + MOS 6502 @ 1.789 MHz (audio)
The convertible cartridge-based arcade platform behind Marble Madness, Road Runner, and RoadBlasters — built so an operator could swap one game for another by changing a cartridge board and its SLAPSTIC security chip.
Atari System 1 was Atari Games' answer to a commercial problem: arcade operators did not want to buy an entire new cabinet and board set for every game. The System 1 design put the expensive, reusable hardware — a Motorola 68010 main CPU at 7.159 MHz, a MOS 6502 sound CPU at 1.789 MHz, the system ROM, the text and graphics display hardware, and the control interfaces — on a large permanent board. Two big edge-card connectors then accepted a plug-in "cartridge board" that supplied the actual game: the program ROMs, sound ROMs, graphics ROMs and shift registers, and a copy-protection chip called the SLAPSTIC. The SLAPSTIC is the detail that made the convertible concept work as a business. It was a small security chip that handled bank switching but also enforced that each game's ROMs would only run with the matching SLAPSTIC. The five System 1 games each used a different SLAPSTIC, so an operator could not simply burn new EPROMs and turn a Marble Madness machine into an Indiana Jones and the Temple of Doom — the conversion required Atari's official cartridge and its chip. The chip was used across Atari coin-op from 1984 to 1990 and became a well-known reverse-engineering target for the preservation community. The cartridge board could also carry optional sound hardware — POKEY chips, a Yamaha YM2151 FM synthesiser, or a TI TMS5220 speech synthesiser — so each game brought whatever audio capability it needed rather than paying for all of it on the base board. Marble Madness (1984), the platform's debut, paired this hardware with a trackball and a set of isometric courses that had to be navigated against a strict timer, and was notable for one of the earliest arcade uses of an FM synthesiser score, composed by Brad Fuller and Hal Canon. System 1 hosted a small but well-remembered library: Marble Madness, Peter Pack Rat, Indiana Jones and the Temple of Doom, RoadBlasters, and Road Runner. Gauntlet and Gauntlet II used hardware that was electrically very similar but built onto a single board rather than the convertible cartridge design. The platform is remembered less for raw power than for the modular, convertible philosophy — an early attempt to treat arcade hardware as a reusable platform with swappable software, a decade before that idea became standard through boards like the Neo Geo MVS.