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Looking for 7800 Maria schematics

7800 maria schematics atari gcc

4 replies to this topic

#1 jlanier OFFLINE  

jlanier

    Star Raider

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Posted Sun Sep 16, 2012 3:41 PM

I've scoured the web and the AA archives and I can't seem to find any schematics for the 7800 Maria. I'm referring to logic diagrams for the chip itself, not the 7800 motherboard. These do seem to exist for TIA but I can't find any for the Maria. Does anyone know if they even exist? Surely GCC must have had to conceptualize the internal logic of the chip at some point during development, right?

The reason I ask is because I'm working on a hardware project for the 7800 and I've hit a point where I fear the only way to proceed forward will likely be to attempt to replace the Maria chip with an equivalent. This has already been done with TIA but I have yet to see this done with Maria. If anyone has any information at all, it would be greatly appreciated.

#2 Mitch OFFLINE  

Mitch

    Quadrunner

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Posted Sun Sep 16, 2012 11:12 PM

I don't believe one was ever released. Curt V probably has a hard copy, I don't know what the legal status is on it though.

Mitch

#3 DanBoris OFFLINE  

DanBoris

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Posted Tue Sep 18, 2012 6:32 PM

I don't believe one was ever released. Curt V probably has a hard copy, I don't know what the legal status is on it though.

Mitch


I've never seen them either. Mitch is right, if anyone has them it would be Curt.

#4 Trebor OFFLINE  

Trebor

    River Patroller

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Posted Thu Sep 20, 2012 8:38 PM

More info needed than this (?):
http://www.atarimuse...maria_specs.pdf

As Dan and Mitch stated...Curt is your man:

http://www.atarimuse...7800/7800-20th/

"The display consisted of the internal schematics and chip plots of the MARIA"

Edited by Trebor, Thu Sep 20, 2012 8:46 PM.


#5 jlanier OFFLINE  

jlanier

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Posted Fri Sep 21, 2012 2:49 PM

More info needed than this (?):
http://www.atarimuse...maria_specs.pdf


Yes, more than that. The electrical specs are useful for building a circuit with a Maria chip, but not much help in recreating the internal logic to replace a Maria chip.


As Dan and Mitch stated...Curt is your man:

http://www.atarimuse...7800/7800-20th/

"The display consisted of the internal schematics and chip plots of the MARIA"


Aha! Yes, now that's more like it... So I guess I'll have to try and contact Curt; clearly he has this information. Thanks for the info.





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