Jay Silverheels, on Sun Oct 24, 2010 5:40 PM, said:
Oh, quite right. I meant at the time it was sold. Now, every Aq user should have 32k. I hate to send us on a tangent, but Mattel claimed the Aquarius was expandable to 52k. From discussions on the Yahoo group, I gathered that means it would take up the cart rom address space. I.e. you can't have 52k of ram AND a rom cart running simultaneously. Can you confirm my understanding?
Ah, understood. Yes, putting 16K of RAM in the cartridge space would indeed give you 52K: 16K in the cartridge space, 32K in the RAM space, and 4K onboard. It is possible to have RAM "underneath" the cartridge ROM (I know Atari computers do this when the built-in BASIC is enabled), but in order to access it, you'd need a way to disable and re-enable the ROM in software. I don't know of any way to do this on the Aquarius, and if you really need more than 32K, you could just as easily use a bankswitched RAM nowadays (although the software would have to be specifically designed to support it).
Jay Silverheels, on Sun Oct 24, 2010 5:40 PM, said:
Yes, the 32K cart was a released product. Mine is still in its "retail" box. They were sold by the mail-order distributors I mentioned. Interestingly, by the time Mattel dropped the line and Radofin continued, the 4k cart disappeared. They only offered the 16K and 32K carts. The 4K to 32K retrofit will be great!
Thanks for the clarification. I'll definitely document the 4K-to-32K upgrade. It's really quite simple; the hardest part is getting rid of the old chips and the damned RF shield that Radofin welded onto the board.
Jay Silverheels, on Sun Oct 24, 2010 5:40 PM, said:
That would be great, but I personally wouldn't risk my multi-cart experimenting. Your technical feat given its due credit (it's great finally having a hardware guy interested in the Aquarius; James' awesome emulator pretty much took us as far as it could on the software side), I personally think all Aquarius users need to get a Mini-Expander. They'll be missing out on joypad usage, and many sounds/songs without it.
The Aquarius really should never have been sold without the Mini-Expander; it's a seriously crippled system without it. It's somewhat unique to have two cartridge ports available instead of just one, especially since they're more like fully-featured expansion slots than the usual cartridge ports. You can put almost any kind of peripheral you can imagine (flash card adapters, etc) into that "Memory" slot, and still have the "Program" slot available for cartridge software. I do know that, if it wasn't for the Mini-Expander, I probably wouldn't have given the Aquarius a second look.
I also tend to agree about keeping the ROM and RAM separate. My original concept for the board included onboard RAM as a standard feature. I very quickly got rid of it because of a lack of space, but thinking about it later, I realize that it's "cleaner" to keep the RAM as a separate option, which can be upgraded or replaced individually. However, if you know for a certainty that the Mini-Expander will never be an option, at least now there's a way to squeeze in some extra RAM without it.
I didn't mean to derail this thread ...