Routines
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60667: Check S Key During Display
Used by the routines at Display_High_Score_Entry_Screen and Attract_Mode_Loop.
Reads keyboard row 253 (A-S-D-F-G) during the high score display loops. Forces the upper three bits high and checks for the S key alone. If S is the only key held, discards the caller's return address and jumps to the tape load continuation handler at PlayerDeath_TapeLoadContinue with the header parameters from 50429 and 50430. Returns normally if no matching key is detected.
Check_S_Key_During_Display 60667 LD A,253 Read from the keyboard;
Port Number Bit
0 1 2 3 4
253 A S D F G
60669 IN A,(254)
60671 OR %11100000 Force bits 5-7 high.
60673 CP 253 Return if the S key is not the only key pressed.
60675 RET NZ
60676 POP HL Discard the caller's return address from the stack.
60677 LD A,(50429) Load the tape header byte from 50429 into B.
60680 LD B,A
60681 LD A,(50430) Load the tape header byte from 50430 into E.
60684 LD E,A
60685 JP PlayerDeath_TapeLoadContinue Jump to the tape load continuation at PlayerDeath_TapeLoadContinue.
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