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Cybernoid

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Posts posted by Cybernoid

  6. Posted

    Well,

     

    this is the 800XL of a friend of mine. It really has lots of guts, who finds them all?

    800XL_B.jpg

    Nice, isn't it?

     

     

     

     

     

    Max chip for SIO2PC.

     

    Dual Pokey

     

    IDE with compactflash adapter.

    256k upgrade (I see the lines going to the PIA).

    EEPROM replacement for OS

     

    Battery backup for memory? Is the battery running the ANTIC?

     

    Nice!

  7. Posted

    Awesome. Thanks! I am debugging the XL now.

     

    Okay. It looks like it is the RAMBO board itself. If I replace the U27 with a 74LS158N. The machine boots just fine. I noticed that wiggling the board will cause the bad chars on screen to change.

     

    It looks like the RAMBO has some bad solder joints... I'll try to fix it.

     

     

    :?:

    now I wish I could have done that ;)

    (got by with emulation though :ponder: )

     

    Hehehe. Yeah, I've got a 130XE, 2 800XLs and a 600XL at work at the moment... Not to mention a Dreamcast and a 1943 Jamma Arcade board...

  8. Posted

    and I see your source! Very nice, cy, and really good job. I will be stea..er borrowing some from it.

     

    Oh yeah, I released the source code. :) That is fine. That is why it is there. So others can use C to create some other games...

  9. Posted

    Well, I picked up a 800XL at a rummage sell. It did not work.

     

    I opened it up and all the chips are socketed and it has a RAMBO XL installed. Does anyone have instructions for the RAMBO?

     

    Thanks,

    C

     

     

    Here is a PDF of the RamboXL manual.

     

     

    Awesome. Thanks! I am debugging the XL now.

  10. Posted

    Jellybeans is antic 4?

     

    Yup. Just load it in the emulator and start the monitor and type "dlist". Most of the display list lines are 4.

     

    I think that Crownload and Flowers Mania are also Mode 4. These are more fun!

  13. Posted · Edited by Cybernoid

    Sorry for the brief description. I am an electrical engineer and have brought several 8bits and even a TT back to life. So, I do not mind debugging this myself. I just have not had a chance to see the RAMBO at work. I was curious about jumper on the RAMBO board.

     

    Here is what is happening:

     

    The machine does power on. I get a garbled video screen out. This screen however looks like part of the built in self test (memory test) with different character set.

     

    I was planning on disabling the rambo, then swapping out the OS ROM.

     

    However, can you send the RAMBO XL instructions. I think I just need to disconnect the 4 pins from PIA, reconnect them to the board and replace U27 with the same chip as in U26.

     

    Thanks,

    C

  20. Posted

    to correctly convert composite video to rgb is a pretty major undertaking. It requires a lot of decoding. without a conversion box, Your best bet is s-video. Your pin out for s-video is correct. You can tie 1 and 2 to ground. Take a look at my XEGM video upgrade that includes instructions for adding a s-video jack to the back of the unit. It might have some info you are looking for. I just posted it here:

    http://www.atariage.com/forums/index.php?showtopic=102734

     

    Yup, that is right. To correctly convert S-video to RGB with a homebrew circuit, would take some work (well, luma is not a problem, but demodulating the chroma is). The file I posted was a "low-cost" solution for back in the day. However, it only uses the upper 3 bits of the luma to drive R, G and B (one bit per color). So, if your program you are running sets the background to 0 and the foregroung to 0xe, then it would show up as white on black, but if the program uses 0 for the background and say 0x0a for the foreground, then this would look like purple on black.

     

    You could however, build a circuit that would do 4-bit per pixel greyscal by connecting the 4 luma pins on the GTIA to each of the R, G and B 4 pins on this thing:

     

    http://www.digilentinc.com/Products/Detail...;Nav2=Accessory

     

    Then, you would need a VGA to 5-BNC (RGB+HV) to connect up to a flat panel that take RGB and external syncs or build the VGA to 13pin connector on the ST monitor or be lucking enough to have a multi-sync monitor that will work at 15hz or 30Hz. This would have limited uses.

     

    However, all of this will not buy you much as the real low cost solution today would be to drive a scan converter with the Atari S-video output and connect to a VGA monitor. Ah, the advances in video over the last 20+ years and how cheaply companies can make this stuff now...

     

    I use S-video output from all my Atari's and it looks great!

  21. Posted

    This could also be caused by the All-in-wonder hardware delaying this chroma signal a pixel. I used to test video hardware and it looks like the chroma signal is phase mis-aligned from the luma. (That is the chroma is delayed by a pixel or more.) There might be a luma and/or chroma phase adjust hardware register setting in the All-in-wonder.

     

    Also, try using the DScaler software (It works with the ATI All-in-wonder) and adjust the BDelay Value (I think this is the Burst delay and it is hot keys "D" and "Shift-D".

     

    DScaler here: http://deinterlace.sourceforge.net/

    More on its hot-keys here: http://deinterlace.sourceforge.net/Help/keyboard.htm

     

    --C

  22. Posted

    Does anyone know more about this modification? (see included zip).

     

    It looks like it would be possible to drive an ST monitor with the right connection to the 13pin connector and with a simple sync separator circuit.

     

    Also, what is the A103 chip on the 800 motherboard? Is this the GTIA? If so, does this mod just use one of the 4 luma outputs from the GTIA for each color component, one for Red, one fore Green, and one for Blue? This would be 3bit color.

     

    rgb800.zip

  23. Posted

    My Ansiterm will do 40 column text with 16 colors for the foreground color and 16 colors for the background color. It uses Antic mode E and a 4 pixel wide font (similar to the software 80 column trick with Antic mode F). It also used interlaced mode (flipping between 2 screens for the 16 colors), however you could easily produce a 40 column screen with 4 colors for the foreground and 4 colors for the background.

     

    For example, you could have white, red, blue and black colors, then you can have foreground/background like red on black, blue on white, etc...

     

    post-4398-1172349515_thumb.png

    post-4398-1172349468_thumb.jpg

     

    Executible w/ R:handler

    http://www.atariage.com/forums/index.php?a...st&id=67655

  25. Posted

    Does anyone know where I could get a 30-pin Male-Male Cardedge connector? Something that looks like a small PC board with just straight/parallel traces at 0.1 pitch that run from one side of the board to the other.

     

    I am looking to insert on of these into the cart port and put a 30-pin ribbon cable on it...

     

    thanks

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