Grand Theft Auto on Amiga 1200? AmiGTA1 beta makes it real

AmiGTA1 has reached its first beta release, giving Amiga users an early playable version of a native AmigaOS 68k implementation of the original Grand Theft Auto. The beta is still some distance from recreating the complete 1997 game, but the new build provides a functioning foundation with city rendering, vehicles, traffic, collision handling and support for both AGA and RTG graphics.

Grand Theft Auto running natively on AmigaOS 68k

AmiGTA1 is being developed by Grzegorz Korycki as a ground-up reimplementation rather than a direct conversion of the original PC executable. The engine is written for Motorola 68020-class processors and above, with the game code using fixed-point arithmetic rather than floating-point calculations.

The approach is intended to keep the software suitable for conventional AmigaOS 68k hardware without requiring an FPU. Graphics support covers both AGA and RTG configurations, while chunky-to-planar conversion is used where required for the Amiga display hardware.

The beta contains three executable configurations. The AGA build operates at 320 × 200, while an RTG version provides a 320 × 240 CyberGraphX or Picasso96 display. A second RTG option outputs at 640 × 480 while internally rendering the game at 320 × 240 and doubling the result. Minimum requirements currently call for a 68020 processor or better, approximately 8 MB of Fast RAM and a 1 MB stack.

The first GTA returns to its top-down roots

Grand Theft Auto was originally developed by DMA Design and published by BMG Interactive in 1997 for MS-DOS and Windows, with a PlayStation edition following soon afterwards. The game eventually also appeared on Game Boy Color.

Long before the series moved into full 3D with Grand Theft Auto III, the original GTA presented its cities from an overhead perspective. Players could travel on foot, take vehicles from the street and accept criminal assignments while moving freely around large urban maps.

Its campaign took place across Liberty City, Vice City and San Andreas, names that would later become central locations throughout the GTA series. Progress was based heavily around earning points through missions and other activities rather than following the more cinematic mission structure associated with later entries.

Driving was already an important part of the design. Different vehicles had their own handling characteristics, while traffic, collisions and police pursuit systems contributed to the game’s open-ended structure.

AmiGTA1 already has traffic and vehicle physics working

The current AmiGTA1 beta concentrates heavily on recreating the original game’s underlying city and vehicle systems. Liberty City can already be rendered using the converted original game data, while the player can move around the streets, enter vehicles and drive through active traffic.

Vehicle acceleration, sliding, mass, collision response and AI traffic routing are being reproduced using behaviour derived from the original game rather than simply approximating how the PC version looked.

The beta also makes several changes to collision handling. Positional correction between overlapping vehicles has been adjusted, vehicle mass calculations have been corrected and collision impulses are now applied once per contact rather than repeatedly while two vehicles remain overlapping. Knocked vehicles can also settle naturally before returning to their traffic lanes. The release additionally removes unnecessary screen closing and reopening operations that previously occurred immediately after start-up.

Several major GTA systems are still to come

Despite reaching beta status, AmiGTA1 remains an early implementation rather than a complete Amiga edition of Grand Theft Auto. Major gameplay components including missions, weapons, audio, police behaviour and the wanted-level system are not yet fully integrated.

What the first beta release provides is the underlying engine needed to run the city, player movement, vehicles and traffic directly under AmigaOS 68k. With installation changes and revised collision handling included in this release, AmiGTA1 has moved from an initial technical build towards a more usable beta that can now be tested on a broader range of compatible Amiga configurations.

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