Dragon's Lair Fans - Arcade Lifestyle

General Chat => Arcade Lifestyle => Topic started by: PaTrYcK on October 26, 2014, 05:18:48 PM

Title: The Invaders Zaccaria
Post by: PaTrYcK on October 26, 2014, 05:18:48 PM

New comer, The Invaders Zaccaria, 1979!

Cab complete and in good condition but will be a long restoration  :o


(http://i.imgur.com/WD1yzEs.jpg)

(http://i.imgur.com/3Bhx9X1.jpg)

(http://i.imgur.com/S30zzh9.jpg)

Title: Re: The Invaders Zaccaria
Post by: PaTrYcK on October 27, 2014, 10:02:18 AM

Hi, today i check board game, usually i see that there are 2708 in pcb, instead there is satellite board with prom...

(http://i.imgur.com/xQcE1TL.jpg)

(http://i.imgur.com/ewygODA.jpg)

Title: Re: The Invaders Zaccaria
Post by: PaTrYcK on November 07, 2014, 06:28:09 PM

The restoration goes on,  pcb have some problems:

(http://i.imgur.com/TbGGQjW.jpg)


http://www.youtube.com/watch?v=V9saFvGeAZE


now my friend Piero work on pcb the invaders, some ram have been replaced:

(http://i.imgur.com/VPkKdzi.jpg)

now the situation is better not yet fully functional, the problem could be in the prom on satellite board, someone have dumped it?

(http://i.imgur.com/agTP3yg.jpg)

Title: Re: The Invaders Zaccaria
Post by: PaulSwan on November 08, 2014, 04:29:08 AM

What's left doesn't look like a PROM problem, more like a video address problem from the video counters given it looks like you have a repeated screen.
Paul.

Title: Re: The Invaders Zaccaria
Post by: piero.a on November 18, 2014, 09:40:03 PM

Quote from: PaulSwan on November 08, 2014, 04:29:08 AM

What's left doesn't look like a PROM problem, more like a video address problem from the video counters given it looks like you have a repeated screen.
Paul.

Hello Paul,

I absolutely agree with you but which is the video address decoder?

Schematic seems to be unavailable. All video ram are tested and good.

May be the BPROM 6/82S140 involved on video addressing?

I dumped IC6 (82S140) and 31 (82S190) but I haven't a good dump to compare because both are not present in mame dump.

I'm unable to use my fluke (and 2650 adapter) because bus test fail (Data bit 0 and 2 or 7 tied low). I have the same issue on Astrowars and quasar but I solve the problem pulling out the 74LS244 (13E on astrowars and 3G on quasar) just to make ram/rom testing

I guess that there's a more elegant solution :)

Title: Re: The Invaders Zaccaria
Post by: PaTrYcK on November 26, 2014, 08:27:51 PM

My friend piero fix pcb zaccaria, buffer 40097 faulty...

Now is ok!

http://youtu.be/BuiqpNkBMu4

Title: Re: The Invaders Zaccaria
Post by: blackie63 on November 26, 2014, 08:36:55 PM

thats some good work getting it up and running correctly  ;D