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Epoch Cassette Vision and uPD77X chips #102087 10/19/15 03:52 PM
Joined: Aug 2009 Posts: 192 Montreal P plgDavid OP Senior Member
OP plgDavid Senior Member P Joined: Aug 2009 Posts: 192 Montreal	SlyDC just updated his blog with a bit more info: http://discreteconsoles.blogspot.ca/2015/10/nec-upd774c.html He's traced the pins of the NEC all in one micro, (thanks!)

Re: Epoch Cassette Vision and uPD77X chips plgDavid #102088 10/19/15 04:05 PM
Joined: Mar 2008 Posts: 1,049 Shideravan Very Senior Member
Shideravan Very Senior Member Joined: Mar 2008 Posts: 1,049	Awesome! "A user interface is like a joke. If you have to explain it, it's not that good."

Re: Epoch Cassette Vision and uPD77X chips plgDavid #102089 10/19/15 04:49 PM
Joined: Mar 2006 Posts: 1,074 Likes: 5 PA, USA L Lord Nightmare Very Senior Member
Lord Nightmare Very Senior Member L Joined: Mar 2006 Posts: 1,074 Likes: 5 PA, USA	PlgDavid: can you ask slydc to flip the pcb over in this pic: http://1.bp.blogspot.com/-S0V0h08qeQ8/ViRDlpe0uPI/AAAAAAAAASc/NLHVDKUgaCw/s1600/battle%2Bvader.jpg and take a picture of the back? The 'two missile pins' and 'two start pins' thing is confusing. Are they shorted together when the button is pushed? LN "When life gives you zombies... CHA-CHIK! ...you make zombie-ade!"

Re: Epoch Cassette Vision and uPD77X chips plgDavid #102092 10/19/15 05:13 PM
Joined: Aug 2009 Posts: 192 Montreal P plgDavid OP Senior Member
OP plgDavid Senior Member P Joined: Aug 2009 Posts: 192 Montreal	No need here are scans of mine (after removing the chip) Last edited by plgDavid; 10/19/15 05:14 PM.

Re: Epoch Cassette Vision and uPD77X chips plgDavid #102094 10/19/15 05:17 PM
Joined: Aug 2009 Posts: 192 Montreal P plgDavid OP Senior Member
OP plgDavid Senior Member P Joined: Aug 2009 Posts: 192 Montreal	And the Cassette Vision JR PCB scan

Re: Epoch Cassette Vision and uPD77X chips plgDavid #102095 10/19/15 05:19 PM
Joined: Aug 2009 Posts: 192 Montreal P plgDavid OP Senior Member
OP plgDavid Senior Member P Joined: Aug 2009 Posts: 192 Montreal	Full album here My Cassette VIsion pictures

Re: Epoch Cassette Vision and uPD77X chips plgDavid #102100 10/19/15 07:32 PM
Joined: Mar 2006 Posts: 1,074 Likes: 5 PA, USA L Lord Nightmare Very Senior Member
Lord Nightmare Very Senior Member L Joined: Mar 2006 Posts: 1,074 Likes: 5 PA, USA	On the cartridge: capacitor C01, I see one leg connects to upd pin 18; where does the other leg go? Also what are the markings on capacitors C01 thru C04? Also is resistor R02 5.6K or 5.7K? the stripe is poorly visible. Also are there any markings on R04 to show what value/type of resistor pack it is? LN Last edited by Lord Nightmare; 10/19/15 07:34 PM. Reason: add question about R04 "When life gives you zombies... CHA-CHIK! ...you make zombie-ade!"

Re: Epoch Cassette Vision and uPD77X chips plgDavid #102102 10/19/15 08:29 PM
Joined: Mar 2006 Posts: 1,074 Likes: 5 PA, USA L Lord Nightmare Very Senior Member
Lord Nightmare Very Senior Member L Joined: Mar 2006 Posts: 1,074 Likes: 5 PA, USA	Here's my hacked together diagram so far of the pinout: https://dl.dropboxusercontent.com/u/79094972/uPD77x_pinout.txt "When life gives you zombies... CHA-CHIK! ...you make zombie-ade!"

Re: Epoch Cassette Vision and uPD77X chips plgDavid #102103 10/19/15 09:47 PM
Joined: Aug 2009 Posts: 192 Montreal P plgDavid OP Senior Member
OP plgDavid Senior Member P Joined: Aug 2009 Posts: 192 Montreal	C01 1uF 50v (neg terminal goes to ground) C02 10uF 16v C03 1200pF (122) C04 47nF (473) R02 is green brown red gold (hence 5.1k Ohms 5%) R04 7X682M Last edited by plgDavid; 10/19/15 09:48 PM. Reason: typo

Re: Epoch Cassette Vision and uPD77X chips plgDavid #102105 10/19/15 11:31 PM
Joined: Mar 2006 Posts: 1,074 Likes: 5 PA, USA L Lord Nightmare Very Senior Member
Lord Nightmare Very Senior Member L Joined: Mar 2006 Posts: 1,074 Likes: 5 PA, USA	Updated, thanks! "When life gives you zombies... CHA-CHIK! ...you make zombie-ade!"

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