Special Functions; Alternate Display Of Two Graphics Screen; Displaying Two Graphics Screens At 60Hz; Interlace Display - Yamaha V9938 Programmer's Manual

6.1. Alternate display of two graphic screen pages
Two graphics screen pages may be alternatively displayed in G4 to G7 modes
automatically. In G4 and G5 modes, the following pages can be displayed alternatively:
page 0 and page 1, and page 2 and page3. In G6 and G7 modes, pages 0 and 1 will be
alternatively displayed. Please refer to chapter 6.2 for description of page concept.
G4 and G5 modes
Page 0
Page 1
Page 2
Page 3
Display time period of between 166 ms and 2053 ms may be specified for each page.
See section 3.2.6 for information about available time periods.
• Specify the odd page address in the pattern layout table register R#2
• Specify ON (even page) and OFF (odd page display) intervals in register R#13

6.2. Displaying two graphics screens at 60Hz

Bit 2 "EO" of register R#9 can be used for displaying two graphics screens alternately
at 60Hz. Set the odd page pattern layout table in register R#2. Then set bit 2 of register
R#9 to 1.
6.3. Interlaced display
This function displays the first and the second fields on the same page: set the bit 3
"IL" of the register R#9, to 1. To display even page in the first field and odd page in
second field, set odd page in pattern layout table register R#2, and set both bits 2 "EO"
and 3 "IL" in register R#9, to 1.
© 1985 ASCII CORP. / NIPPON GAKKI CO.

6. SPECIAL FUNCTIONS

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G6 and G7 modes
Page 0
Page 1
© 2010-2015 Eugeny Brychkov