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JamesD

Joust for the CoCo 3

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FWIW, this uses the arcade Joust code.  Transcode, port, or whatever it's called, it's arcade Joust.

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That is amazing!   What did it take to port this?

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Williams uses the 6809, so the game logic is largely intact as is.
However, the arcade game has custom hardware for a lot of stuff that has to be replaced with the CPU.
This includes a blitter, sound chips, and the graphics support more colors.
So the sounds are samples that are played through the DAC with a timed CPU interrupt, sprites are drawn with optimized 6809 code, graphics are adapted to the CoCo 3.
And on top of that, the arcade game had copy protection that had to be patched, and the change in screen aspect ratio had to be dealt with.
The author may have some discussion on his blog, and it was discussed on an episode of CoCoTalk!, though I haven't gotten to watch it yet.
He has a largely completed version of Defender as well, but he hadn't tracked down an issue in it.  From his comments it was the same copy protection so he should be able to finish that soon.

 

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Trying to get this running on my COCOSDC, but I'm getting a blank screen.

I put the joust.dsk file on the SD, then DIR- to list, shows the file, then

DRIVE 0,"JOUST"

OK

LOAD "JOUST"

OK

but then EXEC gives me ?FC ERROR

So I try RUN, that goes to a black screen, then eventually a garbled pattern of blinking graphics?

 

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1 minute ago, VicViper said:

Trying to get this running on my COCOSDC, but I'm getting a blank screen.

I put the joust.dsk file on the SD, then DIR- to list, shows the file, then

DRIVE 0,"JOUST"

OK

LOAD "JOUST"

OK

but then EXEC gives me ?FC ERROR

So I try RUN, that goes to a black screen, then eventually a garbled pattern of blinking graphics?

 

Wait am I dumb? Do I need more than 128K RAM?

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3 minutes ago, VicViper said:

Wait am I dumb? Do I need more than 128K RAM?

Gidday mate.

 

Yes Joust needs more then 128k ram, Need a 512k ram board min to run it.

 

laters

 

Briza

 

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53 minutes ago, Briza1 said:

Gidday mate.

 

Yes Joust needs more then 128k ram, Need a 512k ram board min to run it.

 

laters

 

Briza

 

Dangit. Thanks for the tip.

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Yeah, the sound samples and graphics take up a lot of RAM

 

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8 minutes ago, JamesD said:

Yeah, the sound samples and graphics take up a lot of RAM

 

Already shopping for a RAM board 😅

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10 hours ago, VicViper said:

Already shopping for a RAM board 😅

Oh, and we all get the garbled screen during loading, so don''t panic.. but get at least a 512k 

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On 9/6/2021 at 9:28 AM, MrDave said:

Oh, and we all get the garbled screen during loading, so don''t panic.. but get at least a 512k 

Yep, ordered a 512K Triad board from Mark Marlette.

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