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- The IBM PC Color Display
-
- Stevanne Ruth Lehrman
- Boston Computer Society
- IBM PC Users' Group
-
- After a six week wait, I received my
- IBM Color Display. It was love at
- first use. Until then, we had been
- using a color/graphics monitor from
- another vendor.
-
- Our search for a monitor that
- combined high resolution, color and
- an affordable price was extremely
- frustrating. At under $1,000, you get
- either high resolution or color;
- rarely both. The better color
- displays cost over $1500 and
- resolution still did not compare
- favorably to the resolution on
- mainframe graphics terminals. At
- $600, the IBM PC Color Display is a
- winner.
-
- Money buys everything. The more
- picture elements (pixels) in a given
- space, the sharper the image. A
- monitor offering 1280 by 1024
- resolution will provide sharper
- images than a monitor offering 560 by
- 240 resolution. But within a price
- range, resolution variances are
- insignificant.
-
- To test a graphics monitor, try the
- following:
-
- Fill the screen with text. Then check
- the image for sharpness and
- completeness of letters, especially
- in the top and bottom lines. Letters
- should be easy to read, with no
- shadowing or fuzziness. Next, draw
- lines, squares and circles. Are the
- straight lines straight or do they
- waver? Are the squares really square
- or are they trapezoidal? How
- noticable are the lines which make up
- the circle?
-
- My IBM Color Display passed both
- tests with flying colors. The text in
- 40 and 80 character width was crisp
- and relatively easy to read. (Of
- course, nothing approaches the IBM
- Monochrome Monitor in this area.)
- Lines are straight, angles accurate,
- circles not distorted by "jaggies".
- The images compared very favorably to
- those shown on more expensive
- monitors with higher degrees of
- resolution.
-
- Many monitors in the same price range
- as the IBM lack long persistence
- phosphors. While most offer a high
- refresh rate, flicker is common. The
- IBM monitor has the right combination
- of both and gives an eye-pleasing,
- stable display.
-
- Color is the outstanding feature: the
- IBM monitor offers the best color
- quality of any monitor under $1500.
- The colors are bright, clear and
- true. Brown is brown; cyan is a
- deep, intense blue green. Grey and
- white are easily distinguishable from
- each other.
-
- The number of colors displayable is a
- function of the monitor plus the
- color/graphics adapter.
- Unfortunately, the current IBM color
- card does not exploit the full
- potential of its own 6845 graphic
- chip. In text mode, color selection
- is limited by the adapter board to
- one to eight background colors, with
- one of 16 foreground colors
- (characters may be made to blink). In
- medium resolution, background may be
- one to 16 colors, while foreground is
- three colors from one of two preset
- palettes. In high resolution, only
- black and white are available. In
- contrast, by using the Color-plus
- Color Graphics Adapter, the IBM color
- monitor can produce 16 colors in
- medium resolution. In high
- resolution, the Colorplus provides
- one of 16 foreground colors with
- three background colors (i.e., the
- same selection as the IBM adapter
- board in medium resolution).
-
- The Color Display is an excellent
- choice for anyone interested in
- graphics. It combines high quality
- with an affordable price.