Creativision MegaSDCart

Talk about programming CreatiVision (except games programming). Projects of homebrew hardware are also welcome.
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nippur72
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Re: New hardware coming soon...

Post by nippur72 » Fri Mar 18, 2022 1:20 pm

thanks for the explanation, interesting design.

There are similar projects that halt the CPU via the 6502 "RDY" pin and write to the bus, but I guess on the CV it's not possible because such pin is not connected on the mainboard.

In my project with the VIA chip I get loading times around 3-4 seconds for large files, not bad but still slower than your MegaSDcart :-) I use one of the VIA 8 bit ports for data exchange plus two additional lines for handshake. All is driven by a DOS that resides in ROM (written in C).
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Scouter3d
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Re: New hardware coming soon...

Post by Scouter3d » Fri Mar 18, 2022 1:38 pm

Hi nippur72,

sounds also very interesting, i guess my Replika Apple 1 Mobo will forever only be a nice walldecoration (as a few parts are very hard to come by and rather expensive...)

Cheers, TOM:0)
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nippur72
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Re: New hardware coming soon...

Post by nippur72 » Fri Mar 18, 2022 5:34 pm

yes such parts are very hard to find :-(

I love the Apple1 but honestly there's not much you can do with it, the display is too limited IMO, you can't write games or things like that. We have build a TMS9918 video card expansion for it, but in the end you are just recreating a Creativision LOL

Anyway if you are into MiST FPGA I made a very accurate Apple1 implementation that has a 15Khz video output and can even load and save real tapes. It's not like the real thing but it's the closest you can get without having the original chips.
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Mobsie
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Re: New hardware coming soon...

Post by Mobsie » Fri Mar 18, 2022 5:50 pm

That’s cool, can you share your apple1 photos? As an Apple freak you would made me happy 😎
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nippur72
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Re: New hardware coming soon...

Post by nippur72 » Sat Mar 19, 2022 7:23 am

Mobsie wrote:
Fri Mar 18, 2022 5:50 pm
That’s cool, can you share your apple1 photos? As an Apple freak you would made me happy 😎
I don't have an A1 myself, but Claudio (the hardware designer in our team) has a replica, here are two videos showing our experiments:
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Mobsie
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Re: New hardware coming soon...

Post by Mobsie » Sat Mar 19, 2022 12:01 pm

Cool, thank you
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Scouter3d
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Re: New hardware coming soon...

Post by Scouter3d » Tue Mar 29, 2022 8:57 am

Hi,

i just ordered the first Prototype PCB for the MegaSDCart... should be in my hands in three weeks... :0) - soooo excyting!

Cheers, TOM:0)
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Scouter3d
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Re: New hardware coming soon...

Post by Scouter3d » Fri Apr 08, 2022 8:56 am

Hi,

the Prototype-PCBs have arrived! I will test them in the next days.. :0)

Cheers, TOM:0)
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MADrigal
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Re: New hardware coming soon...

Post by MADrigal » Fri Apr 08, 2022 9:28 am

OMG thats so cool!!!
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Mobsie
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Re: New hardware coming soon...

Post by Mobsie » Fri Apr 08, 2022 4:32 pm

So great 👍👍
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