Startup routine
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81B4: Start
We jump here from the load routine at 802F.
81B4 LD SP,$5CFE Put the stack somewhere safe
81B7 EI Enable interrupts
81B8 LD HL,$4000 Copy the top character line of the display file (8x32 bytes) to the third character line from the bottom
81BB LD DE,$50A0
81BE CALL $50E5
81C1 LD H,$B7 Fill in the second character line from the bottom with the necessary code
81C3 LD DE,$50C0
81C6 CALL $50E5
81C9 LD DE,$5D00
81CC CALL $54F2 Prepare 5D00 to 5DFF
81CF CALL $54F2 Prepare 5E00 to 5EFF
81D2 CALL $54F2 Prepare 5F00 to 5FFF
81D5 LD DE,$8000 Copy 256 bytes from E300 to 8000
81D8 LD BC,$0100
81DB LD HL,$E300
81DE LDIR
81E0 LD H,$61 Move 7936 bytes from 6100 down to 6000
81E2 LD D,$60
81E4 LD B,$1F
81E6 LDIR
81E8 LD B,$FC
81EA LD (DE),A Zero out addresses 7F00 to 7FFB (the game status buffer)
81EB INC E
81EC DJNZ $81EA
81EE LD DE,$8100 Prepare to copy 256 bytes from 5B00 to 8100 (thus overwriting this routine)
81F1 LD HL,$5B00
81F4 INC B
81F5 JP $55A0
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