Nightshade: Routine at CA2B

Used by the routine at MENU.

Prints the menu's eight lines from the three lists at MENU_COLOURS -- a colour, a position and a string each -- and, the first time after MENU_SHOWN was cleared, draws the border round the screen (PRINT_BORDER). Called when the menu starts and on every pass of its loop (MENU); printing the same text over itself changes nothing but the attributes, which is how the flashing lines change. Alien 8's DISPLAY_MENU and its DISPLAY_TEXT_LIST in one, since Nightshade prints no other list.

Used by the routine at MENU. Prints the menu's eight lines from the three lists at MENU_COLOURS -- a colour, a position and a string each -- and, the first time after MENU_SHOWN was cleared, draws the border round the screen (PRINT_BORDER). Called when the menu starts and on every pass of its loop (MENU); printing the same text over itself changes nothing but the attributes, which is how the flashing lines change. Alien 8's DISPLAY_MENU and its DISPLAY_TEXT_LIST in one, since Nightshade prints no other list.
DISPLAY_MENU	CA2B	LD DE,MENU_COLOURS	DE' = the colours
	CA2E	EXX	DE' = the colours
	CA2F	LD HL,MENU_PLACES	HL = the positions, DE = the strings; eight lines
	CA32	LD DE,MENU_TEXT
	CA35	LD B,$08
DISPLAY_MENU_LINE	CA37	LD A,(HL)	L = x, H = y; HL moved on to the next pair and kept
	CA38	INC HL
	CA39	INC HL
	CA3A	PUSH HL
	CA3B	DEC HL
	CA3C	LD H,(HL)
	CA3D	LD L,A
	CA3E	EXX	this line's colour into A', from DE'
	CA3F	LD A,(DE)
	CA40	INC DE
	CA41	EX AF,AF'
	CA42	EXX
	CA43	CALL PRINT_TEXT_SINGLE_COLOUR	print it, and loop
	CA46	POP HL
	CA47	DJNZ DISPLAY_MENU_LINE
	CA49	LD A,(MENU_SHOWN)	the border has been drawn already
	CA4C	AND A
	CA4D	RET NZ
	CA4E	INC A	the first time: say so, and draw it
	CA4F	LD (MENU_SHOWN),A
	CA52	JP PRINT_BORDER