Sega 32X Handbuch Seite 36

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36
VDP Registers
(Both MEGA Drive and SH2 Common)
Display mode Selection
Bitmap Mode Register
(Access : Byte/Word)
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Read only
R/W
R/W
R/W
R/W
MD Side
A1 5180h
SH Side
2000 4100h
PAL
-
-
-
-
-
-
-
PRI
240
-
-
-
-
M1
M0
Switching is always allowed, but is valid from the next line.
PAL: TV format
0: PAL
1: NTSC
Switching is possible only during V Blank
PRI: Screen priority (explained later)
0: MEGA Drive has priority (initial value)
1: 32X has priority
Switching is always allowed, but is valid from the next line.
240: 240 Line Mode (Valid only when PAL)
0: 224 Line (initial value)
1: 240 Line
M1
M0
Mode
0
0
Blank Mode (intial vlaue)
0
1
Packed Pixel Mode
1
0
Direct Color Mode
1
1
Run Length Mode
Switching is always allowed, but is valid from the next line.
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