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41661: Routine at A2BD
Used by the routines at 41700, 41853, 45981 and 50385.
41661 LD A,(IX+5) A=*IX+5.
41664 RRCA RRCA.
41665 RRCA RRCA.
41666 RRCA RRCA.
41667 RRCA RRCA.
41668 AND %00001111 Keep only bits 0-3.
41670 LD C,A C=A.
41671 LD A,(IX+7) A=*IX+7.
41674 AND %11110000 Keep only bits 4-7.
41676 ADD A,C A+=C.
41677 LD (40990),A Write A to *40990.
41680 LD A,(IX+1) A=*IX+1.
41683 RRCA RRCA.
41684 RRCA RRCA.
41685 RRCA RRCA.
41686 RRCA RRCA.
41687 AND %00001111 Keep only bits 0-3.
41689 LD C,A C=A.
41690 LD A,(IX+3) A=*IX+3.
41693 AND %11110000 Keep only bits 4-7.
41695 ADD A,C A+=C.
41696 LD (40989),A Write A to *40989.
41699 RET Return.
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