SimCity 2000 on Amiga gets a new update with RTG graphics and MIDI music

SimCity 2000 is getting some attention on the Amiga, with a new update bringing RTG graphics support and MIDI music playback to the 1994 release. The SC2000RTG patch tackles a graphics compatibility problem affecting computers equipped with modern Amiga graphics cards, letting the game run through Picasso96 without crashing during screen rendering. There’s more to it than a graphics fix. The update introduces flexible display resolutions, changes the screen mode selection process and adds an optional MIDI utility capable of playing music from the DOS Special Edition. For Amiga owners running upgraded hardware, it’s a practical set of changes. The original game remains intact, but its display and audio options now extend beyond the configurations available in the initial release.

SimCity 2000 on the Amiga

Maxis released SimCity 2000 for DOS and Macintosh in 1993, with the Amiga conversion following in 1994. Designed by Will Wright and Fred Haslam, the sequel expanded the original SimCity formula with an isometric city view, terrain elevation and a much broader selection of municipal infrastructure.

City management became considerably more detailed. Players could construct underground transport systems, manage water supplies, adjust taxation and develop residential, commercial and industrial districts. Schools, hospitals, police stations and transport connections played a role in keeping a city running.

The Amiga release targeted AGA-equipped computers, including the Amiga 1200 and Amiga 4000. It used a 256-colour display and relied on the native Amiga graphics architecture to render its city maps.

This original graphics implementation presents problems on upgraded systems running RTG graphics hardware. The new patch addresses the issue without replacing the game’s underlying simulation.

RTG support fixes a major graphics problem

The most significant change concerns SimCity 2000’s rendering system. The original Amiga version converts chunky pixel data into the planar graphics format used by the AGA chipset. During rendering, the game writes directly to eight bitmap plane pointers in the screen’s BitMap structure.

It’s an approach suited to native Amiga graphics hardware, but it doesn’t work correctly with Picasso96 RTG displays. Picasso96 uses chunky framebuffers rather than the original planar arrangement. When SimCity 2000 attempts to write graphics data using its existing rendering routine, it can overwrite Picasso96 data structures and crash the computer.

SC2000RTG fixes the problem by checking the active screen format. On chunky RTG displays, the patched game writes pixel data directly into the framebuffer, skipping the original chunky-to-planar conversion. Native planar displays continue using the existing AGA rendering routine.

The patch supports both graphics configurations through a single executable, allowing the game to operate on native AGA hardware or supported RTG setups. Compatibility with Kickstart 3.0 remains intact, so the modified graphics handling doesn’t require a newer Amiga operating system.

More screen resolutions and improved display handling

The update goes beyond fixing the RTG crash. SimCity 2000 originally used fixed screen dimensions of 640 × 512 pixels. The patched version can adapt its display, game window and city map view to the dimensions of the selected screen mode.

This gives players more flexibility when running the game on RTG-equipped computers, particularly systems using display configurations outside the original AGA settings. The screen mode selector has received attention, too. It now filters the available display modes to show compatible 8-bit options, reducing the risk of selecting an unsuitable graphics configuration.

A smaller interface adjustment centres the Maxis logo on the startup screen according to the chosen display resolution. RTG operation requires the native game launch rather than the WHDLG AGA configuration. Players can access the native screen mode selector by holding Shift when clicking the game’s launch icon.

MIDI music arrives through a separate utility

Graphics aren’t the only part of SimCity 2000 receiving an update. A separate background utility, SC2000MIDI, introduces MIDI music playback through camd.library. It uses the matching music track numbers found across the Amiga, Macintosh and DOS versions of the game.

This arrangement allows the Amiga release to play the MT-32 music arrangements created by Maxis for the DOS Special Edition. SC2000MIDI reads standard MIDI files and handles playback through the Amiga’s MIDI system. Players need to start the utility before launching SimCity 2000. The updated package includes MIDI files from the PC version, alongside options for launching the standard AGA executable or an AGA configuration with MIDI support. MIDI playback operates independently of the RTG graphics patch, so the music functionality doesn’t require an RTG graphics card.

What changes for SimCity 2000?

The update concentrates on technical compatibility rather than changing how SimCity 2000 plays. Its city-building systems, management options and simulation mechanics remain unchanged. Instead, the patch addresses problems associated with the original graphics implementation and introduces greater flexibility for display and audio configurations.

For systems equipped with Picasso96-compatible RTG hardware, the modified rendering routine removes a significant obstacle to running the Amiga version. Native AGA users retain the existing graphics path, with MIDI playback available through a separate utility. It’s a focused update, covering graphics compatibility, screen resolution handling and additional music playback options without altering the original game content.

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