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Discussing the Open Source FPGA Amiga Project
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 Post subject: zx81
PostPosted: Fri May 04, 2012 8:57 pm 
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Joined: Fri Dec 09, 2011 11:31 am
Posts: 91
So this is the first attempt at the ZX81 working on minimig. So far, I have a fuzzy picture :)
Output signal is composite video

Based on a project basis http://zxgate.sourceforge.net/ and http://zz-indigo.mavipet.sk/?page_id=116

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zx81.png
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 Post subject: Re: zx81
PostPosted: Mon May 07, 2012 11:49 am 
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Joined: Mon Dec 01, 2008 9:58 pm
Posts: 1568
Location: .de
There is a ZX-Spectrum core available in this forum.
Is this the same machine or some newer/older one?

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 Post subject: Re: zx81
PostPosted: Mon May 07, 2012 3:46 pm 
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Joined: Fri Dec 09, 2011 11:31 am
Posts: 91
This is my custom build core (ZX81), within the framework of learning.
Now add scandoubler for vga output.


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 Post subject: Re: zx81
PostPosted: Mon May 07, 2012 5:03 pm 
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Joined: Fri Dec 09, 2011 11:31 am
Posts: 91
Better composite signal....

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ZX81_01.png
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ZX81_02.png
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 Post subject: Re: zx81
PostPosted: Mon May 07, 2012 6:51 pm 
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Joined: Mon Dec 01, 2008 9:58 pm
Posts: 1568
Location: .de
cool! Im looking forward to let it run on my Minimig :)

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 Post subject: Re: zx81
PostPosted: Fri May 11, 2012 6:23 pm 
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Joined: Fri Dec 09, 2011 11:31 am
Posts: 91
Next step, 16kB RAM works (used SRAM). But is there any graphical errors :).

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