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Wilheim

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About Wilheim

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  1. Nah, just trying to give my 2 cents. I do really appreciate your efforts, and that encourages me to bring my help anyway I can.
  2. I understand. Unfortunately, the cartridge area is restricted to $8000-$BFFF. By my side, I will continue developing this project. In case the cartridge works and if you don't mind, I would take a look if it's possible to convert it to this cartridge model.
  3. So, after thinking about @rensoup observations and @Wrathchild suggestions, I'm working on a new design. I decided to make a 16 kbytes bank-switching method, using two diodes and a resistor to make the additional gate needed. It's similar to the Megacart scheme, but using the address bus to switch instead of the data bus. Prior to make the pcbs, I decided to make another pcb to make prototypes. That way, I would be able to test any configuration on a protoboard. I'm temporarily naming the cartridge as "FlashSRAM cartridge". The bank will be selected by storing any value at $D5xx, where xx is the bank number. It's bank scheme would be: 1. Banks $00-$1F: Flash ROM (32 banks 16kbytes each) 2. Banks $20-$3F: SRAM (32 banks 16kbytes each) 3. Banks $40-$7F: unused. 4. Banks $80-$FF: turn cartridge off. I hope to have some news anytime soon with the testing.
  4. Could be an alternative to free a gate. I’ll look into it. Anyway, I prefer to maintain flash properties on the atari computer, so you can update any bugs, improvements or even stuff like high scores, save states, etc.
  5. It’s doable, but it requires an additional glue logic chip. I tried to avoid that, in order to simplicity and space . Making a cartridge that can be programmed on any Atari computer. One alternative is using a GAL programmable logic, but they are getting scarce and it will require additional hardware to store a new logic on there.
  6. The thing is that at the moment it needs 128kbytes RAM, so I'm proposing something that would work with 64k, and so bring a chance to get to a broader computer line.
  7. Yes. Instead of using PORTB,, you just store any value at $D5xx, where "xx" is the bank number as described above. As a external device, that's only doable on XL/XEs machines with expansion port. There are plenty of 65XE without it and you can only expand them by using soldering techniques. In my opinion, is far more complicated. That's even a better idea! I think unrolling data will make the game faster, and we have plenty of space if needed. On the other hand, maybe you don't have to modify that much. You just use the expanded ram provided by the SRAM portion, using 8kbytes bank size. Of course, it's just an idea that came to my mind.
  8. Progress so far. Trying to use glue logic with DIL components to make it easier to assemble.
  9. Not quite. On AtariMax you can flash and store data, but can't work as RAM for processing, for example, with sprite animation or masking. This design would allow it. Besides, AFAIK, AVG uses SIO operations to save, but not for processing.
  10. Hi, all! I was thinking about the RAM requirements to make PoP working on 64kbytes. Maybe a solution would be by using a Corina-like cartridge, using 512 Kbytes of Data on an eprom and 512 Kbytes of SRAM. That way we could use the eprom for data and the SRAM as an expansion area. To do so, I would like to propose this design: 1. 8 kbytes per bank, using $A000-$BFFF 2. Banks $00-$3F as Flash ROM (29f040 or 39sf040), making 64 banks of 8 kbytes each. 3. Bank $40-$7F as SRAM (AS6C4008), having 64 banks of 8 kbytes each. 4. Bank $80-$FF as cartridge disabled. 5. Fit on @Sikor 's cartridge cases If you like this idea, I will gladly design it and test it if it works. Of course, having support from emulators like Altirra would be a nice-to-have. @rensoup what do you think?
  11. Does anyone know if the design is available? Maybe it would be a great oportunity to make it again for Prince of Persia.
  12. Maybe you could use your own SIO driver and calls. One example would be the used on "Joyride" demo from HARD.
  13. Thanks! I bought the parts locally on electronic shops, whose products are mostly from China. Then I adapt the parts and assemble them into the plastic box. Finally, I print a label using adhesive paper with a protection film over it. That brings a glossy finish.
  14. I currently make 9V AC power supplies, using a linear 9vac 3A transformer, a 0.25A fuse (using 220V as input) and a Toshiba notebook plug cable. They fit very nicely on the 1050 and xf551. i strongly suggest to put a fuse on it, in order to prevent any damage on the drive.
  15. Hi, everyone! I'm the happy new owner of a 7800 and I'm looking for a Rikki&Vikki cartridge. I noticed that the original cartridges are run out now, so I was too late to get one. Is there anyone who is willing to sell one? Thank you!
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