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Routines |
| Prev: DE18 | Up: Map | Next: DFC6 |
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Used by the routine at DAC0.
This routine handles the Define keys option menu
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| DE19 | LD HL,$0000 | Reset the keys for Rex movement defined at DE13 | ||
| DE1C | LD ($DE13),HL | |||
| DE1F | LD ($DE15),HL | |||
| DE22 | LD ($DE17),HL | |||
| DE25 | LD IY,$DE13 | Set IY to the base address of the keys defined for Rex movement | ||
| DE29 | LD IX,$E060 | Set IX to address of the text definition data for DEFINE KEYS | ||
| DE2D | LD B,$06 | Set B to the number of rows of the windows | ||
| DE2F | PUSH IY | Save IY | ||
| DE31 | CALL $A2E6 | Draws the windows DEFINE KEYS | ||
| DE34 | POP IY | Restore IY | ||
| DE36 | LD BC,$F7FE | Read keys 1-2-3-4-5 into A | ||
| DE39 | IN A,(C) | |||
| DE3B | BIT 0,A | Is key 1 pressed? | ||
| DE3D | JP Z,$DE36 | Jump back until key 1 is not pressed | ||
| DE40 | LD IX,$E09B | Set IX to the address of the windows defintion for the highlighted options of the menu | ||
| DE44 | LD B,$01 | Set B to the number of files | ||
| DE46 | PUSH IY | Save IY | ||
| DE48 | CALL $A487 | Draw the line of highlighted text UP | ||
| DE4B | POP IY | Restore IY | ||
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Handles the DEFINE UP key
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| DE4D | CALL $DD9B | Check for UP key pressed in the DEFINE keys windows | ||
| DE50 | LD (IY+$00),A | Save the keycode of the key pressed at the UP address of the Rex movement table at DE13 | ||
| DE53 | CALL $DFB1 | Point DE to the address graphics data of the key pressed | ||
| DE56 | LD HL,$488F | Point HL to the address of the diplay file to print the character | ||
| DE59 | CALL $DFBD | Draw the grahics data of character into display file | ||
| DE5C | CALL $A65D | Configure check UP key pressed routine | ||
| DE5F | LD IX,$E0A3 | Set IX to the address of the text definition data for higlighted UP text | ||
| DE63 | LD B,$01 | Set B to the number of lines | ||
| DE65 | PUSH IY | Save IY | ||
| DE67 | CALL $A487 | Draws the line of higlighted text UP | ||
| DE6A | POP IY | Restore IY | ||
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Handles the DEFINE DOWN key
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| DE6C | CALL $DD9B | Check for DOWN key pressed in the DEFINE keys windows | ||
| DE6F | LD (IY+$01),A | Save the keycode of the key pressed at the DOWN address of the Rex movement table at DE13 | ||
| DE72 | CALL $DFB1 | Point DE to the address graphics data of the key pressed | ||
| DE75 | LD HL,$48AF | Point HL to the address of the diplay file to print the character | ||
| DE78 | CALL $DFBD | Draw the grahics data of character into display file | ||
| DE7B | CALL $A676 | Configure check DOWN key pressed routine | ||
| DE7E | LD IX,$E0AD | Set IX to the address of the text definition data for higlighted DOWN text | ||
| DE82 | LD B,$01 | Set B to the number of lines | ||
| DE84 | PUSH IY | Save IY | ||
| DE86 | CALL $A487 | Draws the line of higlighted text DOWN | ||
| DE89 | POP IY | Restore IY | ||
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Handles the DEFINE LEFT key
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| DE8B | CALL $DD9B | Check for LEFT key pressed in the DEFINE keys windows | ||
| DE8E | LD (IY+$02),A | Save the keycode of the key pressed at the LEFT address of the Rex movement table at DE13 | ||
| DE91 | CALL $DFB1 | Point DE to the address graphics data of the key pressed | ||
| DE94 | LD HL,$48CF | Point HL to the address of the diplay file to print the character | ||
| DE97 | CALL $DFBD | Draw the grahics data of character into display file | ||
| DE9A | CALL $A62B | Configure check LEFT key pressed routine | ||
| DE9D | LD IX,$E0B7 | Set IX to the address of the text definition data for higlighted LEFT text | ||
| DEA1 | LD B,$01 | Set B to the number of lines | ||
| DEA3 | PUSH IY | Save IY | ||
| DEA5 | CALL $A487 | Draws the line of higlighted text LEFT | ||
| DEA8 | POP IY | Restore IY | ||
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Handles the DEFINE RIGHT key
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| DEAA | CALL $DD9B | Check for RIGHT key pressed in the DEFINE keys windowse charcode for the key | ||
| DEAD | LD (IY+$03),A | Save the keycode of the key pressed at the UP address of the Rex movement table at DE13 | ||
| DEB0 | CALL $DFB1 | Point DE to the address graphics data of the key pressed | ||
| DEB3 | LD HL,$48EF | Point HL to the address of the diplay file to print the character | ||
| DEB6 | CALL $DFBD | Draw the grahics data of character into display file | ||
| DEB9 | CALL $A644 | Configure check RIGHT key pressed routine | ||
| DEBC | LD IX,$E0C2 | Set IX to the address of the text definition data for higlighted RIGHT text | ||
| DEC0 | LD B,$01 | Set B to the number of lines | ||
| DEC2 | PUSH IY | Save IY | ||
| DEC4 | CALL $A487 | Draws the line of higlighted text RIGHT | ||
| DEC7 | POP IY | Restore IY | ||
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Handles the FIRE key
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| DEC9 | CALL $DD9B | Check for FIRE key pressed in the DEFINE keys windowse charcode for the key | ||
| DECC | LD (IY+$04),A | Save the keycode of the key pressed at the FIRE address of the Rex movement table at DE13 | ||
| DECF | CALL $DFB1 | Point DE to the address graphics data of the key pressed | ||
| DED2 | LD HL,$500F | Point HL to the address of the diplay file to print the character | ||
| DED5 | CALL $DFBD | Draw the grahics data of character into display file | ||
| DED8 | CALL $A612 | Configure check FIRE key pressed routine | ||
| DEDB | XOR A | Set input device to keyboard | ||
| DEDC | LD ($A247),A | |||
| DEDF | LD IX,$E04C | Set IX to the address of the text definition for confirm keys | ||
| DEE3 | JP $DF93 | Jump to draw windows confirmation | ||
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This routine handles the Kempston option
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| DEE6 | LD HL,$001F | Set A244 to the port to read the inputs from Kempston joystick | ||
| DEE9 | LD ($A244),HL | |||
| DEEC | LD A,$67 | Set A246 to the BIT opcode corresponent to the FIRE button | ||
| DEEE | LD ($A246),A | |||
| DEF1 | CALL $A612 | Configure check FIRE button pressed routine | ||
| DEF4 | LD A,$5F | Set A246 to the BIT opcode corresponent to the joystick UP | ||
| DEF6 | LD ($A246),A | |||
| DEF9 | CALL $A65D | Configure check joystick UP routine | ||
| DEFC | LD A,$57 | Set A246 to the BIT opcode corresponent to the joystick DOWN | ||
| DEFE | LD ($A246),A | |||
| DF01 | CALL $A676 | Configure check joystick DOWN routine | ||
| DF04 | LD A,$47 | Set A246 to the BIT opcode corresponent to the joystick RIGHT | ||
| DF06 | LD ($A246),A | |||
| DF09 | CALL $A644 | Configure check joystick RIGHT routine | ||
| DF0C | LD A,$4F | Set A246 to the BIT opcode corresponent to the joystick LEFT | ||
| DF0E | LD ($A246),A | |||
| DF11 | CALL $A62B | Configure check joystick LEFT routine | ||
| DF14 | LD A,$FF | Set Kempston as input device type at A247 | ||
| DF16 | LD ($A247),A | |||
| DF19 | LD IX,$E034 | Points IX to the text definition data for CONFIRM KEMPSTON windows | ||
| DF1D | JP $DF93 | Jump to show confirmation windows and handles Y/N key presses | ||
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This routine handles the Sinclair option
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| DF20 | LD HL,$EFFE | Set A244 to the port to read the inputs from Sinclair joystick | ||
| DF23 | LD ($A244),HL | |||
| DF26 | LD A,$47 | Set A246 to the BIT opcode corresponent to the FIRE button | ||
| DF28 | LD ($A246),A | |||
| DF2B | CALL $A612 | Configure check FIRE button pressed routine | ||
| DF2E | LD A,$4F | Set A246 to the BIT opcode corresponent to the joystick UP | ||
| DF30 | LD ($A246),A | |||
| DF33 | CALL $A65D | Configure check joystick UP routine | ||
| DF36 | LD A,$57 | Set A246 to the BIT opcode corresponent to the joystick DOWN | ||
| DF38 | LD ($A246),A | |||
| DF3B | CALL $A676 | Configure check joystick DOWN routine | ||
| DF3E | LD A,$5F | Set A246 to the BIT opcode corresponent to the joystick RIGHT | ||
| DF40 | LD ($A246),A | |||
| DF43 | CALL $A644 | Configure check joystick RIGHT routine | ||
| DF46 | LD A,$67 | Set A246 to the BIT opcode corresponent to the joystick LEFT | ||
| DF48 | LD ($A246),A | |||
| DF4B | CALL $A62B | Configure check joystick LEFT routine | ||
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Reset input device type
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| DF4E | XOR A | Set Sinclair as input device type at A247 | ||
| DF4F | LD ($A247),A | |||
| DF52 | LD IX,$E006 | Points IX to the text definition data for CONFIRM SINCLAIR windows | ||
| DF56 | JP $DF93 | Jump to show confirmation windows and handles Y/N key presses | ||
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This routine handles the Cursor option
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| DF59 | LD HL,$EFFE | Set A244 to the port to read the inputs FIRE, UP, DOWN and RIGHT from Sinclair joystick | ||
| DF5C | LD ($A244),HL | |||
| DF5F | LD A,$47 | Set A246 to the BIT opcode corresponent to the FIRE button | ||
| DF61 | LD ($A246),A | |||
| DF64 | CALL $A612 | Configure check FIRE button pressed routine | ||
| DF67 | LD A,$57 | Set A246 to the BIT opcode corresponent to the joystick RIGHT | ||
| DF69 | LD ($A246),A | |||
| DF6C | CALL $A644 | Configure check joystick RIGHT routine | ||
| DF6F | LD A,$5F | Set A246 to the BIT opcode corresponent to the joystick UP | ||
| DF71 | LD ($A246),A | |||
| DF74 | CALL $A65D | Configure check joystick UP routine | ||
| DF77 | LD A,$67 | Set A246 to the BIT opcode corresponent to the joystick DOWN | ||
| DF79 | LD ($A246),A | |||
| DF7C | CALL $A676 | Configure check joystick DOWN routine | ||
| DF7F | LD HL,$F7FE | Set A246 to the port to read the input LEFT from Sinclair joystick | ||
| DF82 | LD ($A244),HL | |||
| DF85 | CALL $A62B | Configure check joystick LEFT routine | ||
| DF88 | XOR A | Set Cursor as input device type at A247 | ||
| DF89 | LD ($A247),A | |||
| DF8C | LD IX,$E01E | Points IX to the text definition data for CONFIRM CURSOR windows | ||
| DF90 | JP $DF93 | Jump to show confirmation windows and handles Y/N key presses | ||
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Show confirmation windows for input device and handles Y/N key press
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| DF93 | LD B,$01 | Set B to the number of lines | ||
| DF95 | CALL $A2E6 | Draw input device confirmation windows | ||
| DF98 | LD BC,$DFFE | Set BC to port $DFFE for read keys P-O-I-U-Y | ||
| DF9B | IN A,(C) | Check if key Y is pressed | ||
| DF9D | BIT 4,A | |||
| DF9F | RET Z | Return if pressed. Jump to the start routine to init the game | ||
| DFA0 | LD BC,$7FFE | Set BC to port $7FFE for read keys SPACE-SYM-M-N-B | ||
| DFA3 | IN A,(C) | Check if key N is pressed | ||
| DFA5 | BIT 3,A | |||
| DFA7 | JP Z,$DFAD | Jump forward if pressed | ||
| DFAA | JP $DF98 | Jump backs and continue to read for keys if not | ||
| DFAD | JP $DAF1 | Jump back to the main loop routine for the title screen | ||
| DFB0 | RET | |||
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Point DE to the address graphics data of the key pressed
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| DFB1 | LD L,A | Point HL to the address graphic data of the key pressed from the charset table at 6306 | ||
| DFB2 | LD H,$00 | |||
| DFB4 | ADD HL,HL | |||
| DFB5 | ADD HL,HL | |||
| DFB6 | ADD HL,HL | |||
| DFB7 | LD DE,$6206 | |||
| DFBA | ADD HL,DE | |||
| DFBB | EX DE,HL | Exchange DE and HL | ||
| DFBC | RET | |||
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Draw the grahics data of character into display file
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| DFBD | LD B,$08 | Set B to the number of bytes to copy | ||
| DFBF | LD A,(DE) | Copy a byte from the graphics data to the display file | ||
| DFC0 | LD (HL),A | |||
| DFC1 | INC DE | Point DE to the next byte of the graphics data | ||
| DFC2 | INC H | Point HL to the addres of the next row of pixels | ||
| DFC3 | DJNZ $DFBF | Jump back until all the bytes are copied | ||
| DFC5 | RET | |||
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