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#112809 - 03/04/18 01:52 PM Re: Epoch Cassette Vision and uPD77X chips [Re: plgDavid]  
Joined: Jan 2010
Posts: 41
Gilles Fétis Offline
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Gilles Fétis  Offline
Member

Joined: Jan 2010
Posts: 41
France
Advanced a bit more.
The commands are 7 bits wide + a clock from cartridge and an ack from uPD779

here is a schematic of SD208 8049 based cartridge:

basic config from 8049 is
P1 : bit 0-6 : command bit 7 : clock
P2: 4 line of IO + ack from uPD779
bus: 4 lines IO

IO lines are direction + fire + game select + game start + unknown.



[Linked Image]

#112818 - 03/06/18 01:02 AM Re: Epoch Cassette Vision and uPD77X chips [Re: plgDavid]  
Joined: Apr 2012
Posts: 355
ssj Offline
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ssj  Offline
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Joined: Apr 2012
Posts: 355
Nice to see some progress, also nice to hear you didn't fry your cart and/or console after all smile

Since the SD-208 is a 8049 too you can also dump that one right?

#112820 - 03/06/18 11:02 AM Re: Epoch Cassette Vision and uPD77X chips [Re: plgDavid]  
Joined: Jan 2010
Posts: 41
Gilles Fétis Offline
Member
Gilles Fétis  Offline
Member

Joined: Jan 2010
Posts: 41
France
yes the dump should work, I just need to unsolder the 8049 and find my AVR dump code (my eprom programmer cannot read a 8049)

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