ReTargetable Graphics is device driver API mainly used by 3rd party graphics hardware to interface with AmigaOS via a set of libraries. The software libraries may include software tools to adjust resolution, screen colors, pointers and screenmodes. It will use available hardware and will not extend the capabilities in any way.
AmigaOS intuition.lib is limited to display depths of 8-bits but RTG libraries makes is possible to handle higher depths like 24-bits.
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CyberGraphX (pronounced "cybergraphics"), is a ReTargetable Graphics API for the Amiga and compatible computer systems. Developed by Thomas Sontowski and Frank Mariak and later adopted by Phase5 for use with their graphics cards. Many other graphics card manufacturers who offered hardware for Amiga and compatible systems used it as well.
Enhanced Graphics System (EGS) is developed by Viona Development. It can handle screen depths of 24-bits. Graphics board that use EGS include Spectrum and Piccolo. it requires a minimum of 2 MByte RAM and 4 - 5 MByte of harddisc space.[1]
Picasso 96 is the RTG used by the Picasso II, Picasso II+, and Picasso IV graphics boards.
Picasso II uses the Amiga Zorro II bus and the Cirrus Logic GD5426 graphics chip. And requires Workbench 2.0 or above.[2] The maximum pixel frequency that can generated is 85 MHz using 2 MB 60 ns memory.[2]
| Resolution | Depth | Frequency-H | Frequency-V |
|---|---|---|---|
| 1280 × 1024i | 8 | 48.37 kHz | 87 Hz |
| 1152 × 900 | 8 | 63.62 kHz | 68 Hz |
| 1120 × 832 | 8 | 63.1 kHz | 73 Hz |
| 1024 × 768 | 8 | 63.19 kHz | 78 Hz |
| 800 × 600 | 8 | 54.61 kHz | 82 Hz |
| 640 × 480 | 8 | 38.32 kHz | 73 Hz |
| 800 × 600 | 16 | 37.89 kHz | 60 Hz |
| 640 × 480 | 16 | 37.59 kHz | 71 Hz |
| 640 × 480 | 24 | 34.02 kHz | 64 Hz |
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