Deck Of Cards for the HP-15C

This program is by Paul Dale and is used here by permission.

This program is supplied without representation or warranty of any kind. Paul Dale and The Museum of HP Calculators therefore assume no responsibility and shall have no liability, consequential or otherwise, of any kind arising from the use of this program material or any part thereof.

Overview

This HP-15c program draws cards from a standard 52 card deck.

To initialise the deck GSB A.

To draw a card from the deck GSB B. Repeat this step as many times as desired.

Once all cards are drawn the display will show -1, successive GSB B executions just decrement this value further negative. Press GSB A again to reshuffle.

Cards are displayed in the form nn.s where:

nn is the card value (1 - 13, 1=Ace, 11=Jack, 12=Queen, 13=King)
s is the suit (1 - 4).

Listing

001-42,21,11    f LBL A         Initialization entry
002-       5    5               Cards are 0 through 51 = 52 in total
003-       1    1
004-42,23,24    f DIM (i)       Make sure there are enough registers
005-  42  34    f CLEAR REG
006-42, 7, 1    f FIX 1         Set the display for later
007-  44  25    STO I
008-42,21, 0    f LBL 0         Loop over all the cards storing their
009-  45  25    RCL I           values in the registers
010-  44  24    STO (i)
011-42, 5,25    f DSE I
012-  22   0    GTO 0
013-       5    5               Initialize I for drawing from the deck
014-       2    2
015-  44  25    STO I
016-  43  35    g CLx           Clean up and return
017-  43  32    g RTN
018-42,21,12    f LBL B         Draw a card entry
019-       1    1
020-44,30,25    STO- I          Reduce the number of cards by one
021-  45  25    RCL I
022-43,30, 2    g TEST 2   x<0? Check if all cards have been drawn
023-  43  32    g RTN
024-  45  24    RCL (i)         Grab the top card in highest register
025-      34    x⇔y
026-  42  36    f RAN#          Pick a random card to display
027-      20    ×
028-       1    1
029-      40    +
030-  43  44    g INT
031-42, 4,25    f x⇔ I          Index the random card
032-      34    x⇔y
033-42, 4,24    f x⇔ (i)        Swap highest card with random card
034-      34    x⇔y
035-42, 4,25    f x⇔ I          Restore the index/counter register
036-      34    x⇔y             Get card value and convert for display
037-       1    1               Start with the value component
038-       3    3
039-      10    ÷
040-      36    ENTER
041-  42  44    f FRAC
042-       1    1
043-       3    3
044-      20    ×
045-  43  34    g RND
046-       1    1
047-      40    +
048-      34    x⇔y             Now work out the suit
049-  43  44    g INT
050-       1    1
051-      40    +
052-       1    1
053-       0    0
054-      10    ÷
055-      40    +               Combine value and suit and return
056-  43  32    g RTN