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HARDWARE ManualVDP2 User's Manual
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VDP2 User's Manual/Chapter 16 Quick Reference

Screen scroll value (NBG1, horizontal integer part) list
SCXIN1   F    A9876543210
180080H  □□□□□■■■■■■■■■■■
              └┴┴┴┴┴┴┴┴┴┴── N0SCXI10..0 Horizontal scroll value/integer part
detail:
●Screen scroll value register
reference:
■4.2 Scroll screen configuration
■5.1 Screen scroll function
■5.2 Scaling function
■5.3 Line & vertical cell scrolling function

Screen scroll value (NBG1, horizontal decimal part) list
SCXDN1   FEDCBA98       0
180082H  ■■■■■■■■□□□□□□□□
         └┴┴┴┴┴┴┴────────── N1SCXD1..8 Horizontal scroll value/decimal part
detail:
●Screen scroll value register
reference:
■4.2 Scroll screen configuration
■5.1 Screen scroll function
■5.2 Scaling function
■5.3 Line & vertical cell scrolling function

Screen scroll value (NBG1, vertical integer part) list
SCYIN1   F    A9876543210
180084H  □□□□□■■■■■■■■■■■
              └┴┴┴┴┴┴┴┴┴┴── N1SCYI10..0 Vertical scroll value/integer part
detail:
●Screen scroll value register
reference:
■4.2 Scroll screen configuration
■5.1 Screen scroll function
■5.2 Scaling function
■5.3 Line & vertical cell scrolling function

Screen scroll value (NBG1, vertical decimal part) list
SCYDN1   FEDCBA98       0
180086H  ■■■■■■■■□□□□□□□□
         └┴┴┴┴┴┴┴────────── N1SCYD1..8 Vertical scroll value/decimal part
detail:
●Screen scroll value register
reference:
■4.2 Scroll screen configuration
■5.1 Screen scroll function
■5.2 Scaling function
■5.3 Line & vertical cell scrolling function

Coordinate increment (NBG1, horizontal integer part) list
ZMXIN1   F            210
180088H  □□□□□□□□□□□□□■■■
                      └┴┴── N1ZMXI2..0 horizontal direction/integer part
detail:
●Coordinate increment value register
connection:
●Reduction enable register
reference:
■4.2 Scroll screen configuration
■5.1 Screen scroll function
■5.2 Scaling function
■5.3 Line & vertical cell scrolling function

Coordinate increment (NBG1, horizontal decimal part) list
ZMXDN1   FEDCBA98       0
18008AH  ■■■■■■■■□□□□□□□□
         └┴┴┴┴┴┴┴────────── N1ZMXD1..8 Horizontal direction/decimal part
detail:
●Coordinate increment value register
connection:
●Reduction enable register
reference:
■4.2 Scroll screen configuration
■5.1 Screen scroll function
■5.2 Scaling function
■5.3 Line & vertical cell scrolling function

Coordinate increment (NBG1, vertical integer part) list
ZMYIN1   F            210
18008CH  □□□□□□□□□□□□□■■■
                      └┴┴── N1ZMYI2..0 Vertical direction/Integer part
detail:
●Coordinate increment value register
connection:
●Reduction enable register
reference:
■4.2 Scroll screen configuration
■5.1 Screen scroll function
■5.2 Scaling function
■5.3 Line & vertical cell scrolling function

Coordinate increment (NBG1, vertical decimal part) list
ZMYDN1   FEDCBA98       0
18008EH  ■■■■■■■■□□□□□□□□
         └┴┴┴┴┴┴┴────────── N1ZMYD1..8 Vertical direction/decimal part
detail:
●Coordinate increment value register
connection:
●Reduction enable register
reference:
■4.2 Scroll screen configuration
■5.1 Screen scroll function
■5.2 Scaling function
■5.3 Line & vertical cell scrolling function

Screen scroll value (NBG2, horizontal direction) list
SCXN2    F    A9876543210
180090H  □□□□□■■■■■■■■■■■
              └┴┴┴┴┴┴┴┴┴┴── N2SCX10..0 Horizontal scroll value
detail:
●Screen scroll value register
reference:
■4.2 Scroll screen configuration
■5.1 Screen scroll function

Screen scroll value (NBG2, vertical direction) list
SCYN2    F    A9876543210
180092H  □□□□□■■■■■■■■■■■
              └┴┴┴┴┴┴┴┴┴┴── N2SCY10..0 Vertical scroll value
detail:
●Screen scroll value register
reference:
■4.2 Scroll screen configuration
■5.1 Screen scroll function

Screen scroll value (NBG3, horizontal direction) list
SCXN3    F    A9876543210
180094H  □□□□□■■■■■■■■■■■
              └┴┴┴┴┴┴┴┴┴┴── N3SCX10..0 Horizontal scroll value
detail:
●Screen scroll value register
reference:
■4.2 Scroll screen configuration
■5.1 Screen scroll function

Screen scroll value (NBG3, vertical direction) list
SCYN3    F    A9876543210
180096H  □□□□□■■■■■■■■■■■
              └┴┴┴┴┴┴┴┴┴┴── N3SCY10..0 Vertical scroll value
detail:
●Screen scroll value register
reference:
■4.2 Scroll screen configuration
■5.1 Screen scroll function

Reduction enable list
ZMCTL    F     98      10
180098H  □□□□□□■■□□□□□□■■
               ││      │└── N0ZMHF reduction enable
               ││      └─── N0ZMQT reduction enable
               │└────────── N1ZMHF reduction enable
               └─────────── N1ZMQT reduction enable
detail:
●Reduction enable register
connection:
●Map size
reference:
■4.2 Scroll screen configuration
■4.8 Map
■5.2 Scaling function

Line & vertical cell scroll control list
SCRCTL   F DCBA98  543210
18009AH  □□■■■■■■□□■■■■■■
           ││││││  │││││└── N0VCSC vertical cell scroll enable
           ││││││  ││││└─── N0LSCX line scroll enable (for horizontal screen scroll value)
           ││││││  │││└─── N0LSCY line scroll enable (for vertical screen scroll value)
           ││││││  ││└────── N0LZMX line zoom enable
           ││││││  └┴───── N0LSS1,0 line scroll interval
           ││││││ 
           │││││└────────── N1VCSC vertical cell scroll enable
           ││││└─────────── N1LSCX line scroll enable (for horizontal screen scroll value)
           │││└──────────── N1LSCY line scroll enable (for vertical screen scroll value)
           ││└────────────── N1LZMX line zoom enable
           └┴────────────── N1LSS1,0 line scroll interval
detail:
●Line & vertical cell scroll control register
connection:
●VRAM cycle pattern register
●Line scroll table address register
●Vertical cell scroll table address register
reference:
■3.3 How to access VRAM during the display period
■4.2 Scroll screen configuration
■5.3 Line & vertical cell scrolling function

Vertical cell scroll table address (NBG0, NBG1) list
VCSTAU   F            210
18009CH  □□□□□□□□□□□□□■■■
                      └┴┴── VCSTA18..16 Vertical cell scroll table address, upper 3 bits
detail:
●Vertical cell scroll table address register
connection:
●VRAM cycle pattern register
●Line scroll table address register
●Line & vertical cell scroll control register
reference:
■3.3 How to access VRAM during the display period
■4.2 Scroll screen configuration
■5.3 Line & vertical cell scrolling function
Cannot be used together:
■4.11 Mosaic processing

Vertical cell scroll table address (NBG0, NBG1) list
VCSTAL   FEDCBA9876543210
18009EH  ■■■■■■■■■■■■■■■□
         └┴┴┴┴┴┴┴┴┴┴┴┴┴┴──── VCSTA15..1 Vertical cell scroll table address, lower 15 bits
detail:
●Vertical cell scroll table address register
connection:
●VRAM cycle pattern register
●Line scroll table address register
●Line & vertical cell scroll control register
reference:
■3.3 How to access VRAM during the display period
■4.2 Scroll screen configuration
■5.3 Line & vertical cell scrolling function
Cannot be used together:
■4.11 Mosaic processing

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HARDWARE ManualVDP2 User's Manual
Copyright SEGA ENTERPRISES, LTD., 1997