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F429: Offscreen Blit to DF.
Used by the routines at Vecotr_Main and Start.
OffScrBlit F429 DI
F42A LD DE,$4800
F42D LD HL,OffScreen0
F430 LD B,$00
F432 LD A,$08
OffScrBlit_0 F434 EX AF,AF'
F435 PUSH DE
F436 LD A,$08
OffScrBlit_1 F438 PUSH DE
F439 LD C,$20
OffScrBlit_2 F43B LDI
F43D LDI
F43F LDI
F441 LDI
F443 LDI
F445 LDI
F447 LDI
F449 LDI
F44B JP PE,OffScrBlit_2
F44E INC HL
F44F INC HL
F450 POP DE
F451 INC D
F452 DEC A
F453 JR NZ,OffScrBlit_1
F455 POP DE
F456 EX DE,HL
F457 LD C,$20
F459 ADD HL,BC
F45A EX DE,HL
F45B EX AF,AF'
F45C DEC A
F45D JR NZ,OffScrBlit_0
F45F EI
F460 RET
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