| Ground Attack | Routines |
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Used by the routines at GameScreenDisplay and Game_Update.
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| Bg_Update | 68D0 | LD HL,BgMap_RightColTop | Copy the new column into the right column of the main screen mapping | |
| 68D3 | LD DE,BgMap_Row1 | |||
| 68D6 | LD BC,$0021 | |||
| 68D9 | LD A,$16 | |||
| Bg_Update_0 | 68DB | LDD | ||
| 68DD | INC BC | |||
| 68DE | EX DE,HL | |||
| 68DF | ADD HL,BC | |||
| 68E0 | EX DE,HL | |||
| 68E1 | DEC A | |||
| 68E2 | JR NZ,Bg_Update_0 | |||
| 68E4 | LD BC,$02C0 | Scroll screen mapping left one column | ||
| 68E7 | LD DE,BgMap_Start1 | |||
| 68EA | LD HL,_7c6d | |||
| 68ED | LDIR | |||
| 68EF | RET | |||
| 68F0 | NOP | |||
| 68F1 | NOP | |||
| 68F2 | NOP | |||
| 68F3 | NOP | |||
| 68F4 | NOP | |||
| 68F5 | NOP | |||
| 68F6 | NOP | |||
| 68F7 | NOP | |||
| 68F8 | NOP | |||
| 68F9 | NOP | |||
| 68FA | NOP | |||
| 68FB | NOP | |||
| 68FC | NOP | |||
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