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6438: Guide a character up a staircase
The address of this interruptible subcommand routine is placed into bytes 0x09 and 0x0A of a character's buffer by the routine at 6464.
H Character number (0xB7-0xD1)
6438 LD L,$00 Point HL at byte 0x00 of the character's buffer
643A BIT 0,(HL) Is the character midstride?
643C JP NZ,$63FD Finish the stride if so
643F LD L,$0B Byte 0x0B of the character's buffer holds the number of steps left to be climbed
6441 DEC (HL) One fewer now
6442 JP Z,$6390 Terminate this interruptible subcommand if the top of the staircase has been reached
6445 CALL $61B4 Update the SRB for the character's current animatory state and location
6448 DEC D Up a step
6449 INC A One foot forward
644A JP $6130 Update the character's animatory state (to midstride) and location and update the SRB
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