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Text File | 1994-02-10 | 2.0 KB | 54 lines | [TEXT/GEOL] |
- Macintosh IIci: Built-in Video Memory Usage
-
- Article Created: 14 November 1990
- Article Last Reviewed: 10 July 1992
- Article Last Updated:
-
- TOPIC -----------------------------------------------------------
-
- I have a problem with a Macintosh IIci with 1MB of RAM, which allows only
- the Black/White option in the control panel -- even though the monitor is
- RGB. Is there a way to increase the RAM video to allow using 256 colors?
-
- DISCUSSION ------------------------------------------------------
-
- A Macintosh IIci system with 1MB RAM supports up to 256 colors or grays,
- using RAM-based video (RBV). This chart details how much memory is used:
-
- 2 Colors/Grays (1-bit) 64K
- 4 Colors/Grays (2-bit) 96K
- 16 Colors/Grays (4-bit) 160K
- 256 Colors/Grays (8-bit) 320K
-
- A 1MB Macintosh IIci system using 8-bit video would, in effect, be a 704K
- system. This is not recommended, because it doesn't leave much memory for
- the System software and application programs.
-
- A 1MB Macintosh IIci system defaults to 64K of memory allocated for video.
- A Macintosh IIci system with more than 1MB defaults to 320K of memory
- allocated for video.
-
- Here's how to adjust the amount of memory allocated to video:
-
- 1) In the Control Panel, select the Monitors CDEV.
-
- 2) Hold down the Option key. The icon that represents the built-in video
- will contain a very small Macintosh in addition to the monitor number.
-
- 3) Click on the "Options..." button.
-
- The setting in the top half of the dialog allows the user to select the
- gamma table that is to be used to compensate for phosphor luminosity
- characteristics of specific monitors. This setting is not unique to
- the Macintosh IIci and has nothing to do with the amount of memory that
- is allocated to video RAM.
-
- The bottom half of the dialog, labeled "Memory Allocation For Built-In
- Video", contains the radio buttons for setting how much memory is
- allocated to video. This setting limits the maximum number of
- colors/grays that will be supported.
-
-
- Copyright 1990 Apple Computer, Inc.
-
-