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Routines |
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27572 | LD HL,58123 | ||||||||
27575 | LD B,L | B=11 | |||||||
27576 | DEC L | Clear the buffer at 58112, which will be used to store the ASCII codes of the digits | |||||||
27577 | LD (HL),0 | ||||||||
27579 | DJNZ 27576 | ||||||||
27581 | LD A,48 | 48 is the code for '0' | |||||||
Before inserting any ASCII codes into the buffer, we need to figure out whether the first digit is the 10000s, 1000s, 100s, 10s or units digit.
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27583 | LD BC,55536 | BC=-10000 | |||||||
27586 | EX DE,HL | DE=58112 | |||||||
27587 | ADD HL,BC | Subtract 10000 | |||||||
27588 | JR C,27620 | Jump if it 'went' | |||||||
27590 | SBC HL,BC | Otherwise add the 10000 back | |||||||
27592 | LD BC,64536 | BC=-1000 | |||||||
27595 | ADD HL,BC | Subtract 1000 | |||||||
27596 | JR C,27633 | Jump if it 'went' | |||||||
27598 | SBC HL,BC | Otherwise add the 1000 back | |||||||
27600 | LD BC,65436 | BC=-100 | |||||||
27603 | ADD HL,BC | Subtract 100 | |||||||
27604 | JR C,27646 | Jump if it 'went' | |||||||
27606 | SBC HL,BC | Otherwise add the 100 back | |||||||
27608 | LD C,246 | BC=-10 | |||||||
27610 | ADD HL,BC | Subtract 10 | |||||||
27611 | JR C,27658 | Jump if it 'went' | |||||||
27613 | SBC HL,BC | Otherwise add the 10 back | |||||||
27615 | LD A,L | A=units left | |||||||
27616 | AND A | Are there any? | |||||||
27617 | RET Z | Return if not (nothing to do) | |||||||
27618 | JR 27666 | Jump forward to place the units digit into the buffer | |||||||
Compute and insert the 10000s digit.
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27620 | INC A | Get the ASCII code for the 10000s digit in A | |||||||
27621 | ADD HL,BC | ||||||||
27622 | JR C,27620 | ||||||||
27624 | SBC HL,BC | ||||||||
27626 | LD BC,64536 | BC=-1000 | |||||||
27629 | LD (DE),A | Place the 10000s digit into the buffer | |||||||
27630 | LD A,47 | ||||||||
27632 | INC E | Move DE along to the next slot in the buffer | |||||||
Compute and insert the 1000s digit.
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27633 | INC A | Get the ASCII code for the 1000s digit in A | |||||||
27634 | ADD HL,BC | ||||||||
27635 | JR C,27633 | ||||||||
27637 | SBC HL,BC | ||||||||
27639 | LD BC,65436 | BC=-100 | |||||||
27642 | LD (DE),A | Place the 1000s digit into the buffer | |||||||
27643 | LD A,47 | ||||||||
27645 | INC E | Move DE along to the next slot in the buffer | |||||||
Compute and insert the 100s digit.
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27646 | INC A | Get the ASCII code for the 100s digit in A | |||||||
27647 | ADD HL,BC | ||||||||
27648 | JR C,27646 | ||||||||
27650 | SBC HL,BC | ||||||||
27652 | LD (DE),A | Place the 100s digit into the buffer | |||||||
27653 | LD C,246 | BC=-10 | |||||||
27655 | LD A,47 | ||||||||
27657 | INC E | Move DE along to the next slot in the buffer | |||||||
Compute and insert the 10s digit.
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27658 | INC A | Get the ASCII code for the 10s digit in A | |||||||
27659 | ADD HL,BC | ||||||||
27660 | JR C,27658 | ||||||||
27662 | SBC HL,BC | ||||||||
27664 | LD (DE),A | Place the 10s digit into the buffer | |||||||
27665 | INC E | Move DE along to the next slot in the buffer | |||||||
Compute and insert the units digit.
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27666 | LD A,L | A=number of units left | |||||||
27667 | ADD A,48 | A=ASCII code for the units digit | |||||||
27669 | LD (DE),A | Place this into the buffer | |||||||
27670 | RET |
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