Routines
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50B9: Print a message centred across the entire screen
Used by the routine at 52A0.
Input
A Message number
50B9 LD HL,$5000 5000=display file address
This entry point is used by the routines at 51A0, 52A0, 53B1 and 54A0 with HL holding the appropriate display file address.
50BC PUSH HL Save the display file address
50BD LD L,A L=message number
50BE BIT 7,A Is the message number < 0x80?
50C0 JR Z,$50C8 Jump if so
50C2 LD H,$50 Point HL at the appropriate entry in the message address table at 50F4
50C4 LD E,(HL) E=LSB of the message address
50C5 INC HL Point HL at the MSB
50C6 JR $50CC
50C8 LD H,$FE Use the regular message address table for message numbers < 0x80
50CA LD E,(HL) E=LSB of the message address
50CB INC H Point HL at the MSB
50CC LD D,(HL) Now DE=address of the message to print
50CD LD HL,$5B00 Prepare the message in screen-ready form in the buffer at 5B00
50D0 PUSH HL
50D1 CALL $6B1B
50D4 POP HL
50D5 POP DE Restore the display file address to DE
50D6 PUSH DE Display the message on-screen
50D7 LD C,$20
50D9 LDIR
50DB POP DE
50DC INC D
50DD BIT 0,H
50DF JR NZ,$50D6
50E1 RET
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