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It also includes another 128 characters (128-255) like the aforementioned characters for drawing forms. Some of these shapes appear in Unicode as box-drawing characters. There are several attribute values - bit flags that can be set on each character on the screen. These are invisible, underline, normal, bright (bold), reverse video, and blinking.
Monochrome monitors are commonly available in three colors: if the P1 phosphor is used, the screen is green monochrome. If the P3 phosphor is used, the screen is amber monochrome. If the P4 phosphor is used, the screen is white monochrome (known as "page white"); this is the same phosphor as used in early television sets. [2]
For this reason, each of the text and graphics modes has a duplicate mode which disables the composite colorburst, resulting in a black-and-white picture, but also eliminating color bleeding to produce a sharper picture. On RGBI monitors, the two versions of each mode are usually identical, with the exception of the 320 × 200 graphics mode ...
Announced at a retail price of $1000, [44] the 1200XL was released at $899 (equivalent to about $2,800 in 2023). [42] This is $100 less than the announced price of the Atari 800 at its release in 1979, [3] but by this time the 800 was priced much lower. The system uses the SIO port again instead of the Parallel Bus Interface.
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TRS-80 Model 4, 1983 non-gate array version. Tandy Corporation introduced the TRS-80 Model 4 on April 26, 1983 as the successor to the TRS-80 Model III.The Model 4 has a faster Z80A 4 MHz CPU, [5] larger video display of 80 columns by 24 rows, bigger keyboard, and can be upgraded to 128KB of RAM.
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