Rex (Side A): Routine at A46A

A46A: Configure and check key pressed routines for Rex movement

Configure check FIRE key pressed routine. Used by the routines at DE5D and DE99.
A46A	LD HL,($A0AB)	Configure port for key read in routine $A477
A46D	LD ($A478),HL	Configure port for key read in routine $A477
A470	LD A,($A0AD)	Configure operand BIT to check for key press in routine $A477
A473	LD ($A481),A
A476	RET
Check FIRE key pressed. Default key is O. Used by the routines at 947A, 97C3, 97EA, A4E7 and A915.
A477	LD BC,$DFFE	Read port for FIRE key
A47A	IN A,(C)	Read port for FIRE key
A47C	LD HL,$A0AE	Reset input device type
A47F	XOR (HL)	Reset input device type
A480	BIT 1,A	Execute specific BIT operand to test if bit of key FIRE is set
A482	RET
Configure check LEFT key pressed routine. Used by the routines at DE5D and DE99.
A483	LD HL,($A0AB)	Configure port for key read in routine $A490
A486	LD ($A491),HL	Configure port for key read in routine $A490
A489	LD A,($A0AD)	Configure operand BIT to check for key press in routine $A490
A48C	LD ($A49A),A
A48F	RET
Check LEFT key pressed. Default key is Q. Used by the routines at 947A and C27E.
A490	LD BC,$FBFE	Read port for LEFT key
A493	IN A,(C)	Read port for LEFT key
A495	LD HL,$A0AE	Reset input device type
A498	XOR (HL)	Reset input device type
A499	BIT 0,A	Execute specific BIT operand to test if bit of key LEFT is set
A49B	RET
Configure check RIGHT key pressed routine. Used by the routines at DE5D and DE99.
A49C	LD HL,($A0AB)	Configure port for key read in routine $A4A9
A49F	LD ($A4AA),HL	Configure port for key read in routine $A4A9
A4A2	LD A,($A0AD)	Configure operand BIT to check for key press in routine $A4A9
A4A5	LD ($A4B3),A
A4A8	RET
Check RIGHT key pressed. Default key is W. Used by the routines at 947A and C27E.
A4A9	LD BC,$FBFE	Read port for RIGHT key
A4AC	IN A,(C)	Read port for RIGHT key
A4AE	LD HL,$A0AE	Reset input device type
A4B1	XOR (HL)	Reset input device type
A4B2	BIT 1,A	Execute specific BIT operand to test if bit of key RIGHT is set
A4B4	RET
Configure check UP key pressed routine. Used by the routines at DE5D and DE99.
A4B5	LD HL,($A0AB)	Configure port for key read in routine $A4C2
A4B8	LD ($A4C3),HL	Configure port for key read in routine $A4C2
A4BB	LD A,($A0AD)	Configure operand BIT to check for key press in routine $A4C2
A4BE	LD ($A4CC),A
A4C1	RET
Check UP key pressed. Default key is I. Used by the routine at 947A.
A4C2	LD BC,$DFFE	Read port for UP key
A4C5	IN A,(C)	Read port for UP key
A4C7	LD HL,$A0AE	Reset input device type
A4CA	XOR (HL)	Reset input device type
A4CB	BIT 2,A	Execute specific BIT operand to test if bit of key UP is set
A4CD	RET
Configure check DOWN key pressed routine. Used by the routines at DE5D and DE99.
A4CE	LD HL,($A0AB)	Configure port for key read in routine $A4DB
A4D1	LD ($A4DC),HL	Configure port for key read in routine $A4DB
A4D4	LD A,($A0AD)	Configure operand BIT to check for key press in routine $A4DB
A4D7	LD ($A4E5),A
A4DA	RET
Check DOWN key pressed. Default key is J. Used by the routine at 947A.
A4DB	LD BC,$BFFE	Read port for DOWN key
A4DE	IN A,(C)	Read port for DOWN key
A4E0	LD HL,$A0AE	Reset input device type
A4E3	XOR (HL)	Reset input device type
A4E4	BIT 3,A	Execute specific BIT operand to test if bit of key DOWN is set
A4E6	RET