Intellivision II - need IC (U9 - LAD - 5872-0010)

[AtariBuff]

My Intellivision II is in need of a socketed IC (U9 -LAD) with part number 5872-0010. Can someone help out?

[atari-dna]

U9 is the Mattel EXEC rom,

http://console5.com/wiki/RO-3-9502

 

 

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[mr_me]

I believe the Intellivision II has a single Exec chip and doesn't have an RO-3-9502

Not sure where I got this photo but according to it I see the following

 

U1 CPU

U2 16-bit RAM RA-3-9600A

U3 Exec RO-3-9506

U6 Sound AY-3-8916

U5 grom RO-3-9503

U7,U8 gram

U4 STIC

U10 color processor AY-3-8915

U12, U13 scratchpad ram

 

Where is U9?

 

Edit:

U9 is right next to the CPU. In this photo its labelled "Mattel-LAD 2609-0011". LAD is Linaear Analog Digital and feeds the RF modulator (according to the Service Manual http://console5.com/wiki/File:Intellivision_II_Service_Manual,_Model_5872.pdf ). I'm guessing its a custom mattel chip and may be the reason INTV didn't use this design.

Edited January 15, 2016 by mr_me

[atari-dna]

U9 is the extreme upper left NW edge of your photo, I think it's the 39502

This chip is custom stamped in my Intellivision II

Edited January 15, 2016 by atari-dna

[atari-dna]

Hope this photo can help, from my console

 

 

 

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Edited January 15, 2016 by atari-dna

[AtariBuff]

Yes, that's the one. Any clue where I might obtain one of these?

[SiLic0ne t0aD]

If its a custom IC, the only place to acquire such a replacement chip would be from another donor Intv II.

[atari-dna]

Yes, I doubt there are a stockpile of custom Mattel Electronics ICs out there. You'll have to scavenge this from another Inty2 "donor" board

 

 

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