debugger

Oh, ok. Good to know Thankyou.

Are the base rgb values documented?

Thankyou for your help Are the bright values 0000 or 1111 only? Or are intermediate values allowed?

Thanks, i'll try to disassemble it

What i want to say, is: does the 7800 have a fixed color palette? Like "color 1 is black, color 2 is red" etc, a color number that's later retrieved by the vdp from palette ram to paint the color in the tv (i bet that's not the way, because there isn't any place in the memory map) or a 8 bit value composed with a few bits for the color, like (for example!) 3 bits for red, 3 for green and 2 for blue? Any help would be very appreciated!

I see in the Maria register list this info: 0020 - Background color 0021 - Palette 0 color 1 0022 - Palette 0 color 2 0023 - Palette 0 color 3 0025 - Palette 1 color 1 0026 - Palette 1 color 2 0027 - Palette 1 color 3 (etc) What values do i have to store in those registers? I mean, what color format does the 7800 use? If i want a blue or a red, how do i specify it? Thanks

I'm enlisted now too

MorphOS would be interesting

Hello Bruce, thanks a lot for this, i'll take a look inmediatmently

Thanks a lot Mitch It does have two different bytes with the one i had Weird! The source code i have is the one here at atari age. I'll look into the pdf at the web you pointed me

Sorry for always asking about programming stuff guys I'm reading the 7800 bios disassembly and i'm surprised about this: STA LF112 LF112 label is not defined in any place of the code or am i becoming crazy of reading too much 6502 asm lately? Did anyone tried to assemble again this file?

Funny I was asking because i have read somewhere that a pal game on a ntsc console can display a rolling image because being out of sync.

Hi, i'm curious about those PAL<->NTSC conversions, what are the differences? Doesn't the video chips handle all the TV stuff, or an Atari 7800 game needs to access at "low level" to the TV? Or maybe it's just to change a byte somewhere to init the video hardware in a different way?

Oh, Bruce thanks I was forgetting the reset vector, now all looks better Thanks a lot to all of you guys

Mmm are you sure? As far as i know, 7800 games have a checksum check, like some other consoles, to ensure the game is licensed, but nothing more

Hello guys I have another question to you. After downloading some Atari 7800 games i noticed something that i don't understand. First bytes of the roms (raw .bin dumps, or after the 128 bytes of the A78 header) there are bytes that can't be 6502 code. For example, Xenophobe NTSC contains a lot of AA bytes, Asteroids NTSC a repeating pattern 03 FC 00, or Ace of Aces, that even contains a lot of ascii code! What i'm missing here? I tought the game code started in the first byte of the rom! Thaaaaanks a lot for your help

Oh, by the way, what gold sticker?

It's good to know, i'll have to put in different place pal and ntsc games so i don't mix them.... Thanks

So i can't difference between an unopened PAL and unopened NTSC game? Wops

Hi, i'm just curious about the differences between the PAL and the NTSC releases of the Atari 7800 games. There's any difference in manuals, boxes, and cartridge labels?

Do you mean from $40 to $FF right?

Well, for 3 reasons: 1: Because i'm not sure if i can play NTSC games on my PAL console, but in case i can, i'll play slower (at 50hz) and with black borders at top and bottom of the screen (because increased screen resolution in PAL). 2: Because the Atari 7800 was designed to be NTSC 3: Because if PAL games don't work on NTSC systems, maybe i can play the PAL versions i have but with correct resolution/speed Debugger

Erm... guys what reply speed is this? Mm nice to see the modification is suited for ntsc systems too, those are good news (and bad too because i'll have to buy two consoles, then) By some reason or other i tought the upload worked in another way, maybe because the ones i use at work (not for atari, of course) work in a completely different way. The reason to wanting to convert a PAL 7800 into NTSC is that i have more than one PAL consoles, but 0 NTSC ones Thanks for the ultra fast responses..

Hi all I'm just curious about a text file i readed somewhere, about converting a PAL Atari 7800 into a homebrew dev system. Considering that (afaik) the bigger base of Atari 7800 users have a NTSC system, why is this modification suited only for PAL consoles? And why anyone would like to put an EPROM instead of the original console BIOS? And the last question.... I don't have any NTSC 7800, mine is PAL, but i love NTSC I would like to convert one of my consoles to NTSC but i haven't found any information about this, maybe it's not possible? Sorry for not pasting the URL, but i can't remember where i dowloaded the file Debugger

Ok, thanks for all the responses, i think i know now all what i need to continue The only thing i don't fully understand is this stack/tia registers overlap, because it's fun to write to the registers pushing values, but this means that when i need to push something into the stack the console will become crazy, right? Eckhard: The secret project is a secret thing I don't like vaporware at all, so i preffer to work on this before i tell anything to anyone because for now it does not work at all and i don't even know if i'll be able to do it Btw, i have another question, but as it's a totally different thing i'll make another thread for it Debugger