Need help to reproduce the Mega Mix 4 hardware

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TXG/MNX
Captain Atari
Captain Atari
Posts: 159
Joined: Fri Oct 24, 2003 10:05 am

Need help to reproduce the Mega Mix 4 hardware

Postby TXG/MNX » Thu Feb 07, 2019 7:33 pm

Hello,

I got the Mega Mix 4 interface it would allow you to connect upto 4 keyboards on 1 atari.

The interface looks pretty simple only there is one PALCE610H-25PC on it, would like to know how it can be dumped my universal programmer doesnot support this type. I dont know if the chip is copy protected. But when it is could someone reverse engineer it or tell me how-to.
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Arne
Captain Atari
Captain Atari
Posts: 498
Joined: Thu Nov 01, 2007 10:01 am

Re: Need help to reproduce the Mega Mix 4 hardware

Postby Arne » Thu Feb 07, 2019 7:40 pm

This interface is used to connect up to four MegaST/STE or TT keyboards to a MegaST/STE/ or TT?
How are the inputs mapped onto the output? Via mechanical switch?
If so then you may think about using multiplexers like 74HCT157.
Image

TXG/MNX
Captain Atari
Captain Atari
Posts: 159
Joined: Fri Oct 24, 2003 10:05 am

Re: Need help to reproduce the Mega Mix 4 hardware

Postby TXG/MNX » Thu Feb 07, 2019 7:45 pm

this interface is an auto-switch it will make sure the inputs are in sync with the normal input of TT or megaste
no mechanical, I dont have then PALCE610H dump thats the key of this interface the other chip is an 4060

TXG/MNX
Captain Atari
Captain Atari
Posts: 159
Joined: Fri Oct 24, 2003 10:05 am

Re: Need help to reproduce the Mega Mix 4 hardware

Postby TXG/MNX » Thu Feb 07, 2019 7:50 pm

If someone has an idea how this could be build without rebuilding this interface would be fine with me aswell


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