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Re: Epoch Cassette Vision and uPD77X chips [Re: plgDavid] #117309 05/04/20 11:13 AM
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Gilles Fétis Offline
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hello, I'm not here very often...
I still own 2x HMG 7900. I add to pack all electronic stuff for some time but it's now reinstalled in the basement.
Last time I tried I could not read SD208 but I think my clock was not stable enough, I can try again

Re: Epoch Cassette Vision and uPD77X chips [Re: plgDavid] #117310 05/04/20 11:46 AM
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https://www.oguchi-rd.com/schematics/logic/777/777%20Schematics.pdf is very interesting document. Not sure it fits exactly HMG7900 uPD779 but it seems close

Re: Epoch Cassette Vision and uPD77X chips [Re: plgDavid] #117346 05/19/20 01:34 AM
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balrog Offline
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Looks like a document outlining the Cassette Vision assembly code for Big Sports 12 was posted: https://oura.oguchi-rd.com/777/777%20Flowchart.pdf

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