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Atari ST 32Mbit games / diagnostics cartridge

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I posted this on AF a little while ago and thought i'd share it here. I designed a switch-based multicart to try P Putnik's cartridge game conversions on a real ST, it has 32 128k banks and uses a single 27c322 16-bit EPROM. Cartridge images need to be exactly 128k and byte-swapped

stcart2.jpg

As far as I can see, all of the games work fine on my machine (Atari STE with 4mb RAM).

stmulti2.jpg

Works fine as a test cart too, I added all the diagnostics and utility cartridge images i could find.

stcart.jpg

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Cool! :)

 

So, does the ST still boot to a desktop and the selected ROM image is accessible as a drive letter?

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Cool! :)

 

So, does the ST still boot to a desktop and the selected ROM image is accessible as a drive letter?

 

No, nothing that fancy :) You select the ROM image you want using the dipswitches on the board, then power on the ST. It just acts like a single ROM cartridge until you power down and select a different image with the switches.

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Most of games what I converted for cartridge is AUTO run or boot run. So, it will start from cartridge automatically after reset. There is one, what needs to start from Desktop - Star Raiders.

Cartridge port using not regular file access system - you can not access files on it with usual file access commands/way.

 

And correction - must be not exact 128 KB, may be less :) And may put couple short games in 1 slot - then selection appears after reset.

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where can I find info on how to prepare a ROM for a cartridge? I'd love to make a variation of PLATOTERM in this form.

 

-Thom

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where can I find info on how to prepare a ROM for a cartridge? I'd love to make a variation of PLATOTERM in this form.

 

-Thom

http://atari.8bitchip.info/cartST.html

 

Of course, only shorter games, SW may fit. But with efficient packing, + not including title music for instance, many can fit. Even some 2 floppy games like Great Giana Sisters .

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PLATOTERM ST's binary size is 66K, right now.

 

I don't expect it to be much beyond 90K at worst, when done.

 

So I think i'll be fine. :)

 

-Thom

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I suspect I will need to make the cart boot into TOS before PLATOTERM could be accessed, is there any info on how to make a cart that looks like a gemdos drive with plato.prg + rsc on it?

-Thom

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Cart will not look as GEMDOS drive, as is said above.

But you can make PRG with integrated RSC - that even saves some bytes on total size.

And when there is RSC, it can not work in pure AUTO run mode - GEM/AES must be initialized before program start.

So, user will need to put pseudo drive c: (small c) on Desktop, and there may start it with doubleclick. Not too elegant.

Maybe better is to make it as ACC - then can autostart practically - well , another headache session with poor API :)

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Hi bought this card to give it a look, it works fine and i'm wondering if it can also emulate the spectre128 card...

did anyone tested with a 128k apple rom? i'm waiting for a 27c322 eprom to try myself.... 

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Just now, tjlazer said:

Where can I buy one?

i found it on ebay, look for "atari 32 mbit"

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