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 Post subject: 8Mbit Flash Cart Documentation - Writing from Atari to cart
PostPosted: Thu Nov 30, 2023 5:36 pm 

Joined: Thu Nov 30, 2023 5:06 pm
Posts: 2
Hello!

Some time ago I've got an Atarimax 8Mbit Flash Cart.

I'd love to experiment a bit with in-system programming and custom data storage controlled directly from Atari, but the documentation is silent about writing operations.
Is there any information about the memory programming sequence within the system, or at least info about how to get past the GAL chips to access underlying Flash chips?
I'm totally comfortable with working with datasheets, especially SST39 flash chips (and their curious programming sequences).

Any information would be priceless. :)

Thanks,
KK


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 Post subject: Re: 8Mbit Flash Cart Documentation - Writing from Atari to c
PostPosted: Fri Dec 01, 2023 3:00 am 
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Joined: Sun Nov 02, 2003 8:15 am
Posts: 1549
Location: netherlands
To the best of my knowledge, these are standard flash eeproms.
You can program these using the algorithm for 29f040 chips.
The 8mb has two of these, giving 1024k.
The memory window is 8k present on $A000, 128 in total.
You have to write your own software to do this.
Beside that, you can use the studio-software to create a bootable disk that will flash the cartridge with anything you like for you.
Grtz,
Sijmen.


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 Post subject: Re: 8Mbit Flash Cart Documentation - Writing from Atari to c
PostPosted: Fri Dec 01, 2023 4:21 am 

Joined: Thu Nov 30, 2023 5:06 pm
Posts: 2
Thanks for your reply.

I have programmed these chips before, so that's not a problem.
Writing custom Atari software is also not a problem (I've been making lots of demoscene stuff). :)

So, should I just assume that writing to the $A000..$BFFF will correctly pull /WE down on the internal Flash to signal a write?

Thanks,
KK


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 Post subject: Re: 8Mbit Flash Cart Documentation - Writing from Atari to c
PostPosted: Sat Dec 02, 2023 2:23 am 
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Joined: Sun Nov 02, 2003 8:15 am
Posts: 1549
Location: netherlands
I don't have the schematics, but looking at the MyIDE-][ setup (4mb flash), yes, it should.

Switching banks is standard using STA D5xx
xx = 0-127 banks ON
xx= 128 for OFF ( 8k ram is back)

Best is to put the boot-code on bank 0 and 127.
There are new and old 8mb cartridges out there and one start at 0, the other at 127

Grtz,
Sijmen.


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