Brian,
Thanks for the fast reply.
And for the huge help, I'll try this stuff out tonight.
What you were mentioning about PageBreaks... As long as I keep all the room
data within one "High" range I should be ok right?? Like as long as it's
between FE00 and FEFF I shoud be fine, right. (Sorry for such a newbie
question.)
Thanks to all you guys, I really appreciate how helpful everyone is.
----- Original Message -----
From: "Brian Prescott" <bprescot@xxxxxxxxxxxxxxx>
To: <stella@xxxxxxxxxxx>
Sent: Tuesday, June 04, 2002 8:39 AM
Subject: RE: [stella] Adventure, Another Issue (Thanks for yesterday)
> Joel:
>
> The problem is in the RoomNumToAddress subroutine. This routine
calculates
> an address into the room data table. By adding a byte to the arrow
graphic,
> these addresses are all off by one.
>
> In the subroutine, you can change the final bit of code to this:
>
> LDA #<RoomDataTable
> CLC
> ADC $93 ;Add the room data base address
> STA $93 ;to the offset therefore getting
> LDA #>RoomDataTable ; the final room data
> address.
> ADC $94
> STA $94
> RTS
>
> And of course, add the RoomDataTable label at FE1B.
>
> When you do this kind of thing in the actual code instead of the table
data
> at the end, you also need to be aware that page breaks can and do cause
the
> code to go haywire. I found this out in some of my own disassemblies and
> code modifications.
>
> BP
>
> -----Original Message-----
> From: owner-stella@xxxxxxxxxxx [mailto:owner-stella@xxxxxxxxxxx]On
> Behalf Of Joel Park
> Sent: Tuesday, June 04, 2002 8:04 AM
> To: stella@xxxxxxxxxxx
> Subject: [stella] Adventure, Another Issue (Thanks for yesterday)
>
>
> Once I got a newer version of DASM, I was all ready to go and everything
> worked great and I thought I had all the labels added, But...
>
> It still looks to be accessing memory directly somewhere instead of using
my
> labels but for the life of me I can't find it.. I've been through the code
> multiple times, line per line and can't find any place that would be
giving
> me problems.
>
> Here is what I do to test.
>
> I went to the graphic for the Sword and added an extra line of graphics in
> the middle, to make it higher. Then I go clear to the end and there are
> like 9 bytes that are labeled as "Unused", I remove one of them to keep my
> program 4K.
>
> When I compile and run, the whole game is freaking out.. The issue seems
> to be related to the dynamic backgrounds and not my sprites because they
all
> look fine and any changes I make to them are visible.. But the background
> are pretty much all gone and it's just a garbled mess nearly impossible to
> navigate.
>
> The version of the code I attached has all the lables and everything and
> still compiles. Could someone check it out and see if I missed something
> when adding lables or something.. There may be an assembler command that
is
> setting the high byte of my memory addresses and I'm just not picking it
out
> or something.
>
> Thanks,
> Joel D. Park
>
>
>
>
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