ReTargetable Graphics
Encyclopedia
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.
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.
GD5426 graphics chip. And requires Workbench 2.0 or above. The maximum pixel frequency that can generated is 85 MHz using 2 MB 60 ns memory.
Device driver
In computing, a device driver or software driver is a computer program allowing higher-level computer programs to interact with a hardware device....
API
Application programming interface
An application programming interface is a source code based specification intended to be used as an interface by software components to communicate with each other...
mainly used by 3rd party graphics hardware to interface with AmigaOS
AmigaOS
AmigaOS is the default native operating system of the Amiga personal computer. It was developed first by Commodore International, and initially introduced in 1985 with the Amiga 1000...
via a set of libraries. The software libraries may include software tools to adjust resolution
Display resolution
The display resolution of a digital television or display device is the number of distinct pixels in each dimension that can be displayed. It can be an ambiguous term especially as the displayed resolution is controlled by all different factors in cathode ray tube , flat panel or projection...
, screen colors, pointers and screenmodes. It will use available hardware and will not extend the capabilities in any way.
AmigaOS intuition.lib
Intuition (Amiga)
Intuition is the windowing system and user interface engine of AmigaOS. It was developed almost entirely by RJ Mical. Intuition should not be confused with Workbench, the AmigaOS spatial file manager, which relies on Intuition for handling windows and input events.Users may remember the initial...
is limited to display depths of 8-bits but RTG libraries makes is possible to handle higher depths like 24-bits.
CyberGraphX
CyberGraphX , is a ReTargetable Graphics API for the AmigaAmiga
The Amiga is a family of personal computers that was sold by Commodore in the 1980s and 1990s. The first model was launched in 1985 as a high-end home computer and became popular for its graphical, audio and multi-tasking abilities...
and compatible computer systems. Developed by Thomas Sontowski and Frank Mariak and later adopted by Phase5
Phase5
Phase5 Digital Products was a computer hardware manufacturer that made boards for the Amiga computer. Their best known products were accelerator boards which replaced the CPU with a faster model...
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
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 RAM and of harddisc space.Picasso 96
Picasso 96 is the device driver libraries used by the Picasso II, Picasso II+, and Picasso IV graphics boards.Picasso II
Picasso II uses the Amiga Zorro II bus and the Cirrus LogicCirrus Logic
Cirrus Logic is a fabless semiconductor supplier specializing in analog, mixed-signal, and audio DSP integrated circuits . They are presently headquartered in Austin, Texas. Their audio processors and audio converters are found in many professional audio and consumer entertainment products,...
GD5426 graphics chip. And requires Workbench 2.0 or above. The maximum pixel frequency that can generated is 85 MHz using 2 MB 60 ns memory.
| Resolution | Depth | Frequency-H | Frequency-V |
|---|---|---|---|
| 1280 x 1024L | 8 | 48.37 kHz | 87 Hz |
| 1152 x 900 | 8 | 63.62 kHz | 68 Hz |
| 1120 x 832 | 8 | 63.1 kHz | 73 Hz |
| 1024 x 768 | 8 | 63.19 kHz | 78 Hz |
| 800 x 600 | 8 | 54.61 kHz | 82 Hz |
| 640 x 480 | 8 | 38.32 kHz | 73 Hz |
| 800 x 600 | 16 | 37.89 kHz | 60 Hz |
| 640 x 480 | 16 | 37.59 kHz | 71 Hz |
| 640 x 480 | 24 | 34.02 kHz | 64 Hz |
- L = Interlaced mode