Kroko

Both for Congo Bongo and for Sir Lancelot, there are bad dumps out there. I have added a "Bad Dump List" to the Krokodile Commander. If you select such a Dump, it will display a warning. Currently only the two mentioned dumps are on the list. I will add any bad dumps that I come across in future Commander revisions. Should be fixed in revision 1.06 Should be fixed in revision 1.06 DO NOT drive over it with your car please . Its not designed for things like that. If you use it normally, the teeth will not get damaged. But if I should ever make a redesign, I can assure you it will fit in a cart case with almost no modifications and it will not have teeth. Here is the latest Revision: Krokodile Cartridge Website If you are interested, all changes are described in the revision history. Armin

To be honest, I have never heard of a flash chip that needs distinct /CS pulses. Which company makes crap like that ?

I am no longer 100% sure that the above alternate F8 bankswitching will work on all F8 boards that are available. When we discussed this, I was only taking into account the way the F8 switching is done on the Krokodile Cartridge. Now that I have thought about how to do a bankswitching board without clocked logic, I have doubts, that the above method really always works. I also had a look at the schematics from existing discrete F8 boards. Here is the problem: The Krokodile detects a change of adress lines, but a F8 board does not (necessarily) do that. A F8 board could detect a hit of the hotspot area. If the hotspot area is hit, it loads the external capacitor and waits until the voltage has reached the "high" level. If the hotspot area is still hit after this delay, it clocks A0 into the bank register. So if we hit the hotspot area twice in a row, we will most likely get only one rising edge of the "hotspot" detector which means we are only switching once. I have no idea, how all the F8 boards out there work, but at least I fear there is a great risk, that the above code will not work on some of them. The above method would only work on F8 boards, that can also clock A0 into the bankswitching register after a change of A0 within the hotspot area. Unfortunately I have not seen a schematic yet, that does it like that. Has anybody tested the alternate F8 method on different F8 boards, yet ? Armin

Very nice menu

The Pot is inside the metal housing in the center. This metal housing has 3 holes in it. Under the leftmost hole, you will find the pot and you can correct the color with a screwdriver. It is not the top and not the bottom hole, it is middle left. All my light sixers have this hole, but they are all PAL. Maybe NTSC is different ?! Armin

I bought a 7800 on e-bay yesterday. I hope it works and maybe I can find out what the problem is on the 7800

I will make more, but not in the very near future. The best you can do is to contact Albert and join the waiting list. The number of new devices will also depend on how many people are on that list. I know that quite some people are waiting for more devices, but unfortunately I am not able to give you a date, yet

No, that can not cause a problem. The ROM selection is not done by accessing these locations. The ROM selection hotspot is $3F in multicart mode. I have asked this question before, but could you please connect an external power supply to the Krokodile and watch if the behaviour is changed somehow ? I will watch e-bay a little. Maybe I can get a cheap 7800 I feel better if it doesn't matter in case I destroy it.

Is it really always the last game, even if for example only 3 games are on the multicart ? Unfortunately I do not own a 7800. Maybe the 7800 starts up in a different way than the 2600. I would have to buy a 7800 and find out what the problem is. I have currently no idea, why it does not work or if and how it could be fixed. Armin

Even though it seems to be possible .... would it be legal to sell Supercharger games on cart ? I don't think somebody would design such a cart, if selling it is not allowed. I guess it is too much effort just for one private cart. You can easily buy a supercharger for the prototyping costs.

Zero page indexed addressing Read instructions (LDA, LDX, LDY, EOR, AND, ORA, ADC, SBC, CMP, BIT, LAX, NOP) # address R/W description --- --------- --- ------------------------------------------ 1 PC R fetch opcode, increment PC 2 PC R fetch address, increment PC 3 address R read from address, add index register to it 4 address+I* R read from effective address Notes: I denotes either index register (X or Y). * The high byte of the effective address is always zero, i.e. page boundary crossings are not handled. # address R/W description --- --------- --- --------------------------------------------- 1 PC R fetch opcode, increment PC 2 PC R fetch address, increment PC 3 address R read from address, add index register X to it 4 address+X* R read from effective address 5 address+X* W write the value back to effective address, and do the operation on it 6 address+X* W write the new value to effective address Note: * The high byte of the effective address is always zero, i.e. page boundary crossings are not handled. So I guess you always need to forget the highbyte in these adress modes.

Yes, but it is probably not cheap enough ... The clocked logic adds to the costs and it is using a CPLD. Maybe somebody is able to design something cheaper that is better for mass production :-)

What do you think would be "cheap enough" ?

It doesn't have the pins, but some programmers fear that they might occur, even if the pins are not there. I don't know if it is documented in which way the interrupt lines are wired inside the 6507. I think they do exist, but they are not connected. If they are not connected, they might internally be connected to a fixed voltage level or they might float. If they float, interrupts might happen. But I guess they 6507 designers made a good job and you don't have to fear that an interrupt will accidentaly occur. I am not sure, though Thats why I would probably also use a little SEI to be 100% safe.

No, unfortunately not. But I will let you know as soon as I know it. Meanwhile you can ask Albert to set you on the waiting list. This helps me to find out how much demand there is.

Well it works 100% ok for me ....

You need to use the official link: http://www.taswegian.com/TwoHeaded/Atari2600/dasm/

Jr. Pac-Man needs extra RAM. Extra RAM is not supported in multicarts. Only plain F6. I really need to update the Krokodile Commander to prevent the download of unsupported ROMs to a multicart ... Are you sure you download the same Midnight Magic ROM as single and multicart ? The only possible difference is initialisation. In a multicart. RAM and Registers have a defined startup value. If you download standalone, the RAM and Register content is random. So yes, there might be some differences ... Well, you can play whatever you like more

Great Job Thanks !

This should answer your question

Good Job ! I start to think that those companies only invented new BS schemes because there were patent issues with the common ones ?!

I think some of these attachments might help you mem_map_1.txt mem_map_2.txt riot_map.txt tia_map.txt

Thomas already converted both versions. PAL and NTSC gyruss__pal__f4_.zip gyruss__ntsc__f4_.zip

Disable incremental downloading and try to download the bin again. You can PM me if you need further assistance

Very interesting