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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!)

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Awesome! laugh


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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?

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No need here are scans of mine (after removing the chip)



Last edited by plgDavid; 10/19/15 05:14 PM.
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And the Cassette Vision JR PCB scan




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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

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Here's my hacked together diagram so far of the pinout:

https://dl.dropboxusercontent.com/u/79094972/uPD77x_pinout.txt


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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
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Updated, thanks!


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