x68000:screen_control
Differences
This shows you the differences between two versions of the page.
Both sides previous revisionPrevious revisionNext revision | Previous revision | ||
x68000:screen_control [2014/07/27 00:41] – a24tanabe | x68000:screen_control [2019/08/27 20:45] (current) – external edit 127.0.0.1 | ||
---|---|---|---|
Line 86: | Line 86: | ||
====== 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), | ||
+ | In 15kHz we can use only screen mode whose dot number is 512 or 256. |
x68000/screen_control.txt · Last modified: 2019/08/27 20:45 by 127.0.0.1