Ranger was to be the next generation Amiga, which the original West Coast Amiga engineers began working on in 1986-87, following the release of the Amiga 1000. Jay Miner improved the graphics chipset for Ranger to address the twin problems of chip (i.e. Graphics, Sound, DMA) RAM memory space and bandwidth in the Amiga 1000.
The Original Amiga chipset (OCS) allowed a maximum of 512K of chip RAM. This was recognized early on as too limiting, and the Ranger was enhanced to support 2M chip RAM. Additionally, Ranger was designed to make use of VRAM in order to improve the memory bandwidth available for graphics. This would allow for more bitplanes (up to 7) and higher display resolutions (up to 1024x1024). According to the Wikipedia article on Ranger, work on the chipset enhancements was completed before Jay Miner departed Commodore. Other enhancements such as a full 32-bit 68020 CPU were also contemplated for Ranger, but it is not clear how far that work ever got, and Commodore management chose a different path forward.
Because of the cost premium of VRAM vs. DRAM at the time, Commodore management decided to drop Ranger in favor of the Commodore-West Germany project to deliver a more expandable and professional Amiga system in the form of the A2000, while continuing to use the OCS. Noting that there was still no solution to the 512K chip RAM limit, Commodore quickly followed the A2000 release with an enhanced Agnus chip supporting 1M of chip RAM. Later, through the introduction of the Enhanced Amiga Chipset (ECS), the Ranger capability of supporting 2M chip RAM would be realized. This was first shipped along with the Amiga A3000.
Eventually, the Pandora project gained traction within Commodore. This project sought to offer more graphics bandwidth for enhanced resolutions, colors, bit-planes, sprites, and playfields, much like Ranger had sought to do several years earlier. Pandora would eventually be delivered as the Advanced Amiga Graphics Architecture (AGA) chipset found in the Amiga A4000, A1200, and CD32. AGA accomplished much of what was intended for Ranger, if not more in certain respects. However, it was delivered 5 years later and at a time when other bigger industry players had largely caught up to the Amiga's original graphical abilities. The failure to deliver the more advanced graphics chipset sooner is often cited as contributing to the decline of the Amiga and Commodore in the 1990s.
Dave Haynie created a specification for the never delivered Amiga A3000+ in 1991. This could have been the first machine to use Pandora, and so the specification contains some detailed early descriptions of it.