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New development: GTIA in CPLD


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#951 Level42 OFFLINE  

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Posted Wed Jun 13, 2018 11:36 AM

Simius, have you considered designing a STophia ? I mean....a Sophia (like) PCB for the Atari STs Video Shifter ?

Id kill for a direct DVI output on my Mega STE ;)

I have no clue if this woud be much harder to do ? Maybe it could even provide extra graphics modes (which I _would_ find useful on the ST ;)

Edited by Level42, Wed Jun 13, 2018 11:39 AM.


#952 Simius OFFLINE  

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Posted Wed Jun 13, 2018 11:45 PM

It's hard to say. How many Shifters are there? C025914, C070713, C101608, C300588 or more? With some it would be easier, with other harder. An installation would be not as easy and solderless as on the XL/XE, especially on STE (PLCC84 Shifter)  For now I don't even have any ST.



#953 vattari OFFLINE  

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Posted Thu Jun 14, 2018 6:23 PM

Simius, have you considered designing a STophia ? I mean....a Sophia (like) PCB for the Atari STs Video Shifter ?

Id kill for a direct DVI output on my Mega STE ;)

I have no clue if this woud be much harder to do ? Maybe it could even provide extra graphics modes (which I _would_ find useful on the ST ;)

 

Looks like someone was attempting this over at the Atari Forums:

http://www.atari-for...hp?f=15&t=32445



#954 bigral OFFLINE  

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Posted Fri Jun 15, 2018 9:40 AM

topic says: "New development: GTIA in CPLD", but this is just an Atari 8bit computers upgrade for connection to RGB? Am I wrong here? Do you have vhdl code for GTIA replacement?



#955 foft OFFLINE  

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Posted Fri Jun 15, 2018 10:31 AM

topic says: "New development: GTIA in CPLD", but this is just an Atari 8bit computers upgrade for connection to RGB? Am I wrong here? Do you have vhdl code for GTIA replacement?


I think it listens to writes to acquire the bus data and then decodes an0-2. So is doing most of the work of gtia. Rather than just converting lum0-3 and colour to hdmi.

Edited by foft, Fri Jun 15, 2018 10:32 AM.


#956 Simius OFFLINE  

Simius

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Posted Sat Jun 16, 2018 1:45 AM

topic says: "New development: GTIA in CPLD", but this is just an Atari 8bit computers upgrade for connection to RGB? Am I wrong here? Do you have vhdl code for GTIA replacement?

 

Not completely. There is no P-M collision detection, START/SELECT/OPTION keys, trigger inputs.


Edited by Simius, Sat Jun 16, 2018 1:47 AM.


#957 Level42 OFFLINE  

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Posted Sun Jun 17, 2018 2:16 AM

OK I'm puzzled. What is the correct pin-out of the DB9 on a RGB  Rev. B board ?
 


So I finally wired up a temporary db9 to SCART cable and all I got was some I synced trash on the screen......

Looking at what can be wrong.......I finally realised I don’t have a Rev.B board but Rev. a.......

LOL

Firing up the soldering iron again....

#958 Sam83 OFFLINE  

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Posted Wed Jun 20, 2018 2:44 AM

Hi,

 

Just a little post (as I promised to Simius) to show the result on 2 Atari 5200 consoles (2 and 4 ports).
The Mod is very simple because all 5200 have the GTIA on socket and the result is amazing!

 

Thanks Simius ;)

 

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Album: 5200
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