Color Graphics Adapter: Difference between revisions

Revision as of 20:31, 19 September 2024

Revision as of 09:47, 20 September 2024

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{{About|computer architecture||CGA (disambiguation){{!}}CGA}}

{{Infobox GPU

| name = Color Graphics Adapter

| image = File:IBM Color Graphics Adapter.jpg

| codename = 903013

| created = {{Start date and age|1981}}

| transistors =

| architecture = [[Motorola 6845]], ATI CW16800

| entry = IBM Color Graphics Adapter, ATi Graphics Solution Rev 3, ATi Color Emulation Card, Tseng Labs ColorPAK,

| midrange = ATi Graphics Solution plus, ATi Graphics Solution Plus SP, ATi Graphics Solution SR, Number Nine Graphics System

| highend = ATi Small Wonder Graphics Solution, Tseng Labs EVA/480

| enthusiast = ATi Small Wonder Graphics Solution with game port

| openglversion =

| d3dversion =

| predecessor =

| successor = {{plainlist|

*[[Plantronics Colorplus|Plantronics]]

*[[Tandy Graphics Adapter|PCjr/Tandy]]

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*[[Multi-Color Graphics Array|MCGA]]

*[[Professional Graphics Controller|PGC]]}}

| caption =IBM CGA graphics card

| img_w =

| alt = caption

}}

The '''Color Graphics Adapter''' ('''CGA'''), originally also called the ''Color/Graphics Adapter'' or ''IBM Color/Graphics Monitor Adapter'',<ref name=":0" /> introduced in 1981, was [[IBM]]'s first color [[graphics card]] for the [[IBM PC]] and established a [[De facto standard|de facto]] [[computer display standard]].

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Each character cell stored four bits for foreground and background color. However, in the card's default configuration, the fourth bit of the background color does not set intensity, but sets the blink attribute for the cell. All characters on the screen with this bit set will periodically blink, meaning their foreground color will be changed to their background color so the character becomes invisible. All characters blink in unison.

By setting a hardware register, the blink feature can be disabled, restoring access to high-intensity background colors such as yellow, blue, red, orange, green, and pink, and/or purple is my favorite color.

All blinking characters on the screen blink in sync. The blinking attribute effect is enabled by default and the high-intensity background effect is disabled; disabling blinking is the only way to freely choose the latter eight-color indexes (8-15) for the background color.