Routines
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F5CE: Guide a character across a floor to his destination
The address of this interruptible subcommand routine is placed into bytes 0x0E and 0x0F of a character's buffer by the routine at F600. It guides the character left or right across the floor of a building to his final destination.
Input
H Character number (0xD7-0xE5)
F5CE LD BC,$F4E6 Point BC at the routine at F4E6
This entry point is used by the unused routine at F5F6 (with BC=F5A0) and by the routine at F5FB (with BC=F5EE: RET).
F5D1 LD L,$00 Point HL at byte 0x00 of the character's buffer
F5D3 BIT 0,(HL) Is the character midstride?
F5D5 JP NZ,$EC5A If so, move the character from the midstride position and update the SRB
F5D8 LD L,$03 Has this character's command list been marked for a restart?
F5DA BIT 4,(HL)
F5DC JP NZ,$F284 Terminate this subcommand if so (this jump is never made because bit 4 of byte 0x03 is unused)
F5DF LD L,$01 Collect the character's x-coordinate from byte 0x01 of his buffer
F5E1 LD A,(HL)
F5E2 LD L,$10 Compare this with the character's intermediate or final destination x-coordinate
F5E4 CP (HL)
F5E5 JP Z,$F284 Terminate this subcommand if they match
F5E8 PUSH AF Save the carry flag
F5E9 LD DE,$F5EF Push the address of the instruction at F5EF (below) onto the stack
F5EC PUSH DE
F5ED PUSH BC Make an indirect jump to the routine whose address is in BC, and then return to F5EF (below)
F5EE RET
F5EF POP AF Restore the carry flag
F5F0 JP C,$EBAE Make the character move right if he's to the left of his intermediate or final destination
F5F3 JP $EBBB Otherwise make the character move left
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