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Screen over processing bit : Over bit (RAOVR1, RAOVR0, RBOVR1, RBOVR0)
Specify the processing (screen over processing) when the display coordinate value exceeds the display area on the rotary scroll screen. 

RAOVR1,RAOVR0
18003AH
 
 bits 11,10 
 For rotation parameter A 
 RBOVR1, RBOVR0 
 18003AH 
 bit 15 , 14 
 For rotation parameter B 

RxOVR1
RxOVR0
 
 Screen over processing 
 0 
 0 
 Display area outside the display area Repeat image set to 
 0 
 1 
 The screen is out of the display area Repeat the character pattern specified in the pattern name register (only when the rotary scroll screen is in cell format) 
 1 
 0 
 Transparent outside the display area 
 1 
 1 
 Display area is set to plain size or bit Force 0 ≦ X <512, 
 0 ≦ Y <512 regardless of map size, and make everything outside that area transparent
[Note] Bit name x is either A or B.

● Map offset (NBG0 to NBG3)

Map offset (rotation parameters A, B)

Map offset bit : Map offset bit
(N0MP8 to N0MP6, N1MP8 to N1MP6, N2MP8 to N2MP6, N3MP8 to N3MP6, RAMP8 to RAMP6, RBMP8 to RBMP6)
∙ When the display format of the scroll screen is cell format, specify the 3-bit map offset value to be added to the upper part of the 6-bit map register. For bitmap format, specify the bitmap pattern boundary. 

 N0MP8 ~ N0MP6 
 18003CH 
 bits 2-0 
 For NBG0 
 N1MP8 to N1MP6 
 18003CH 
 bit 6 ~ 4 
 NBG1 
 N2MP8 to N2MP6 
 18003CH 
 bit 10 ~ 8 
 NBG2 
 N3MP8 to N3MP6 
 18003CH 
 bit 14 ~ 12 
 NBG3 
 RAMP8 to RAMP6 
 18003EH 
 bit 2 ~ 0 
 For rotation parameter A 
 RBMP8 to RBMP6 
 18003EH 
 bit 6 ~ 4 
 For rotation parameter B

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