Ram help please!

roburt

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I am in need ram expertise from someone. My atari system 2 (xybots again) board has ram problems. This is a topic I know nothing about. I have two suspects.

1st one is...
74LS245N
VV8705 CB

and 2nd one is...
AM9128-10PC
8419WPP

I have found other chips to replace them, but the bottom numbers don't match. Are they lot #s do they specify rating etc.? Any and all help will be very much appreciated. Thank you!
 
Usually the bottom numbers are either date codes (for example, 8705 could mean the 5th week of 1987) or manufacturer info. The top number is the important part...
 
I am in need ram expertise from someone. My atari system 2 (xybots again) board has ram problems. This is a topic I know nothing about. I have two suspects.

1st one is...
74LS245N
VV8705 CB

and 2nd one is...
AM9128-10PC
8419WPP

I have found other chips to replace them, but the bottom numbers don't match. Are they lot #s do they specify rating etc.? Any and all help will be very much appreciated. Thank you!

The second code is the Date Code.

74LS245N is not a RAM chip.

AM9128-10PC is a 2Kx8 RAM.

Quest has them:

http://www.questcomp.com/questdetai..._content=PartDetails&utm_campaign=FindchipsWS
 
Thank you guys a million! I'm trying to follow the schem for this pcb and the locations (17-J) don't exactly line up. I was guessing at the locations basically. Are these chips plu and play or do I have to have them programed?
 
Thank you guys a million! I'm trying to follow the schem for this pcb and the locations (17-J) don't exactly line up. I was guessing at the locations basically. Are these chips plu and play or do I have to have them programed?

Yes, they are "plug and play".
 
Thank you all very much for this info. I've got a few ordered. I'll give you an update once received & installed. Again, thanks!
 
I have not yet received my ram. I removed & swapped the 2 on the board and have had no further problems or errors. Still a graphic glitch I've had from day 1. A fine horizontal line throught the screen only on the enemies. Any thoughts? Maybe a rom problem?
 
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