Routines
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F3B6: Call a routine in bank 3
Input
HL Address of entry point ($C000 + 0/3/6/9)
call_bank_3_128k F3B6 LD ($81C6),HL Self modify 'CALL xxxx' @ $81C5 ($F3D1 before relocation - below)
F3B9 LD HL,$B000 Copy 4096 bytes from $B000 to $F000 (preserving registers for later)
F3BC LD DE,$F000
F3BF LD BC,$1000
F3C2 PUSH HL
F3C3 PUSH DE
F3C4 PUSH BC
F3C5 LDIR
F3C7 LD ($81CE),SP Self modify 'LD SP,xxxx' @ 81CD ($F3D9 here - below)
F3CB LD SP,$A214 Set stack pointer
F3CE CALL $81D6 Call relocated f3e2_128k -- page in?
F3D1 CALL $0000 Call the entry point requested. Self modified by call_bank_3_128k
F3D4 PUSH AF Preserve ?
F3D5 CALL $81D6 Call relocated f3e2_128k -- page out?
F3D8 POP AF Restore ?
F3D9 LD SP,$0000 Restore original SP (self modified by F3C7 above)
F3DC POP BC Copy 4096 bytes from $B000 to $F000
F3DD POP HL
F3DE POP DE
F3DF LDIR Copy
F3E1 RET Return
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