Routines
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6250: Game Selection Menu
Used by the routine at Game_Restart.
Prints the six lines of the game selection menu, each with its own attribute byte and Y position, and then the copyright message at the bottom of the screen. The main registers hold the pointer to the attribute table, and the shadow registers hold the pointer to the Y position table (HL'), the pointer to the text (DE') and the line counter (B').
game-menu
GameMenu 6250 LD DE,$627C Point DE at the table of menu attributes (GameSelection_Attributes).
6253 EXX Switch to the shadow registers.
6254 LD HL,$6282 HL'=GameSelection_Position (the table of Y positions).
6257 LD DE,$6288 DE'=GameSelection_Text (the text of the menu).
There are six lines of text.
625A LD B,$06 Set the line counter in B' to 06.
GameMenu_Loop 625C EXX Switch back to the normal registers.
625D LD A,(DE) Store the attribute byte of the line to Current_MenuAttribute.
625E LD ($5E21),A
6261 INC DE Move onto the next menu attribute.
6262 EXX Switch to the shadow registers.
6263 PUSH BC Stash the line counter (BC') on the stack.
6264 LD A,(HL) Fetch the Y position of the line from the table.
6265 INC HL Move onto the next Y position in the table.
6266 PUSH HL Stash the table pointer on the stack.
6267 LD H,A Set the Y position of the line in H' and the X position (38) in L'.
6268 LD L,$38
626A CALL MenuWriteText Print the line using MenuWriteText.
626D EXX Switch to the shadow registers.
626E POP HL Restore the table pointer and the line counter from the stack.
626F POP BC
6270 INC DE Move DE' onto the next line of text.
6271 DJNZ GameMenu_Loop Decrease the line counter by one and loop back to GameMenu_Loop until all six lines have been printed.
Print the copyright footer.
6273 LD HL,$B800 HL=B800 (the screen position of the copyright message).
6276 LD DE,$5EF5 DE=the copyright message (Message_Copyright).
6279 JP PrintStringColour Jump to PrintStringColour.
View the equivalent code in;
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