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x68000:screen_control [2014/07/27 00:41]
a24tanabe
x68000:screen_control [2014/07/27 01:07] (current)
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 ====== 2-1 Construction of graphic screen ====== ====== 2-1 Construction of graphic screen ======
-====== 2-1-1  ======+====== 2-1-1 Screen mode of graphic screen ​====== 
 +It is shown on Table 1, p.167 that list of screen mode which is considered X68000 supports. 
 +X68000 has many screen modes ,but when pay attention to number of dots,it is combination of 2 types of real screen and 4 types of display screen. 
 +In table, a double circle means that screen mode is supported by BASIC ,XC library, IOCS call. 
 +And a single circle means that screen mode is not supported by system software ,but is to exist in XC programmers manual and so on.
  
 +And it is called high definition mode or normal definition mode in Table 1.
 +That means simply horizontal scan frequency is 31kHz or 15kHz.
 +It it strange 15kHz is called normal mode because X68000 usually uses 31kHz.
 +But this term is often used in manuals by SHARP,so I follow a rule.
 +
 +15kHz is used in analog TV(in Japan,but analog TV broadcast in Japan is discontinued),​then if superimpose mode is used, we use 15kHz mode.
 +In 15kHz we can use only screen mode whose dot number is 512 or 256.
 
 x68000/screen_control.txt · Last modified: 2014/07/27 01:07 (external edit)
 
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