Routines
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F7B1: Change the primary command routine address
Used by the routines at 634C, 7A6A and F748. Places the address of the instruction following the CALL to this routine into bytes 0x08 and 0x09 of the character's buffer, thus making it the address of the character's primary command routine.
Input
H Character number (0xD7-0xE5)
F7B1 EX DE,HL Collect the return address from the stack into DE
F7B2 EX (SP),HL
F7B3 EX DE,HL
F7B4 LD A,L Save L in A briefly
F7B5 LD L,$08 Copy the return address into bytes 0x08 and 0x09 of the character's buffer
F7B7 LD (HL),E
F7B8 INC L
F7B9 LD (HL),D
F7BA LD L,A Restore the original contents of L
F7BB EX DE,HL Restore the return address to the stack
F7BC EX (SP),HL
F7BD EX DE,HL
F7BE RET
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