![]() |
Routines |
Prev: 28292 | Up: Map |
|
||||||||||
28295 | LD E,A | A=N | ||||||||
28296 | ADD A,A | |||||||||
28297 | ADD A,A | |||||||||
28298 | ADD A,E | |||||||||
28299 | ADD A,A | |||||||||
This entry point is used by the routine at 30458 with A=2.
|
||||||||||
28300 | LD D,255 | Prepare DE for subtraction | ||||||||
28302 | NEG | A=-N | ||||||||
28304 | JR 28308 | |||||||||
28306 | LD D,0 | Prepare DE for addition | ||||||||
28308 | LD E,A | Now DE=number of bucks to add (may be negative) | ||||||||
This entry point is used by the routine at 28337 with DE=65535 (-1).
|
||||||||||
28309 | LD HL,(32670) | Collect the current number of bucks from 32670 | ||||||||
28312 | ADD HL,DE | Adjust the number | ||||||||
28313 | INC H | Is the result negative? | ||||||||
28314 | JR NZ,28319 | Jump if not | ||||||||
28316 | LD HL,256 | Set HL up so that the next instruction reduces it to 0 | ||||||||
28319 | DEC H | Restore the value of HL (if it was non-negative), or set it to 0 (if it was negative) | ||||||||
28320 | LD A,H | Set the zero flag if the number of bucks is now 0 | ||||||||
28321 | OR L | |||||||||
28322 | PUSH AF | Save the zero flag temporarily | ||||||||
28323 | LD (32670),HL | Store the new amount at 32670 | ||||||||
28326 | LD DE,20728 | DE=display file address | ||||||||
28329 | CALL 28186 | Print the number of bucks | ||||||||
28332 | POP AF | Restore the zero flag | ||||||||
28333 | RET |
Prev: 28292 | Up: Map |