> StartBid1
> lda #StageBidding1
> sta Stage
> lda Dealer
> adc #$01
> and #$03
> sta Turn
> adc #MsgNumSouth
> sta MessageNum
> lda #StageHold
> sta Stage
> rts
Clear the carry flag before doing your addition :)
ie:
clc ; this one is necessary
lda Dealer
adc #1
and #3
sta Turn
clc ; this one might be optional
adc #MsgNumSouth
Cheers
A
--
_ _ _| _ _ _| _ * _ _ ,
(_|| )(_|( (/_\/\/ (_|(_|\/(_(/_ ,~' L_|\
,-' \
see my Museum of Soviet Calculators at ( \
http://www.taswegian.com/MOSCOW/soviet.html \ __ /
Qb: the latest retro video game! L,~' "\__/
http://www.atari2600.org/qb.html @--> v
----- Original Message -----
From: "Erik J. Eid" <eeid@xxxxxxxxx>
To: "Stella Listserv" <stella@xxxxxxxxxxx>
Sent: Saturday, June 16, 2001 1:28 PM
Subject: [stella] Euchre back with odd behavior
> Greetings again!
>
> I've continued work on my Euchre game. Rather than simply displaying a
few
> cards in your hand and on the table, the game now actually "deals"
> cards. All you see is your hand plus the card turned up for the proposed
> trump suit. Also, to ensure a random first deal, I force the player to
> push Reset. (I hope to have room for a title screen, but for now, there's
> just a game over message.)
>
> I reworked the program to operate in "stages", which indicate what is
going
> on during that frame - shuffling (only once per frame eliminates the
> flicker), dealing (revealing cards), bidding, etc. I also added the
> ability to display a message in the red section at the bottom of the
screen
> and a "cursor" to select a card from your hand (though you won't see it in
> this version).
>
> I'm now coming up against another problem that I can't get past. Some
code
> is behaving in a peculiar way.
>
> Once the deal is complete, players are to start bidding. While I don't
> have bidding set up yet, it starts with the player to the left of the
> dealer, and that player's name (north, east, etc.) should be displayed in
> the message section. However, the name of the player across from the
> dealer is shown instead.
>
> Here's the critical code:
>
> StartBid1
> lda #StageBidding1
> sta Stage
> lda Dealer
> adc #$01
> and #$03
> sta Turn
> adc #MsgNumSouth
> sta MessageNum
> lda #StageHold
> sta Stage
> rts
>
> What this does is set the current stage to the first phase of bidding, set
> the current turn to the player one "above" (meaning, to the left) of the
> dealer, show the message appropriate to that player (since south is the
> zeroth player, adding the turn to south's message number should bring up
> the first bidder's name), and put the program in a hold state.
>
> I used the debugger in PCAE and found something astonishing! Whatever is
> in the accumulator after the "lda Dealer" statement is increased by two,
> not one, by "adc #$01". To see this yourself, open up the debugger, find
> address 12D5, click the Here button, go back to the program window (it
> helps not to be in full-screen mode), hit F2 to reset, then click Trace
> repeatedly. Watch the accumulator. It will be increased by two.
>
> Am I just misunderstanding how an immediate-mode adc is supposed to work,
> or is there something very wrong here? (It is interesting to note that
the
> value of memory location 01 - VBLANK - is 2 when this code is executed.)
>
> This oddness occurs under PCAE, Stella, and Z26, so I'm inclined to think
> my code is bad, but I can't see where at the moment.
>
> (The newbie strikes again...)
>
----------------------------------------------------------------------------
----
>
> . . \_ +\_ + o_-/ . O
> . \-_o -=/- . .
> . . \=// .
> ---------\_______ ||O ___.______
> /* Erik Eid */ \____||L/\_____/
> /* eeid@xxxxxxxxx */_______________________
-
Archives (includes files) at http://www.biglist.com/lists/stella/archives/
Unsub & more at http://www.biglist.com/lists/stella/
