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99/4a TMS4116-15 Memory , will -25 slower memory work ?

Replacement memory chips

4 replies to this topic

#1 TI998owner OFFLINE  

TI998owner

    Space Invader

  • 47 posts

Posted Mon Apr 29, 2019 7:51 PM

Hi Group,
,
Been a very long time since I replaced a set of memory chips
On the TI99/4a main board. My question is , found a person that
Has some replacement TMS4116-25 memory chips. What I was looking for
Was the Original TMS4116-15 , that are in the 99/4a .
,
Does anyone know if these slower Memorys will work as replacements
and any effects or problems they might cause ?
,
Also does anyone know of a good source for the faster TMS4116-15 Memory ?
Or possible does anyone have a bunch they would be willing to
Sell plus shipping.
,
His
Basic price per chip he has is .85 CENTS to $1 per chip plus
Shipping. If someone has them at or near this price , please PM
Me.
Thanks for any info in advance
TI998owner on atariage
Lee

#2 Stuart OFFLINE  

Stuart

    Dragonstomper

  • 881 posts
  • Location:Southampton, UK

Posted Tue Apr 30, 2019 1:47 AM

According to Appendix B of the VDP data manual, 4116-15 and 4116-20 RAMs should be OK, but 4116-25 RAMs will not work under worst case conditions.



#3 Lee Stewart ONLINE  

Lee Stewart

    River Patroller

  • 3,990 posts
  • Location:Silver Run, Maryland

Posted Tue Apr 30, 2019 4:32 AM

Unicorn Electronics has them for $1.19 and the faster 120ns for $1.99.  They have free shipping, but their order minimum is $30.

 

...lee



#4 arcadeshopper OFFLINE  

arcadeshopper

    River Patroller

  • 4,401 posts
  • Location:Portland, Oregon USA

Posted Tue Apr 30, 2019 8:20 AM

I'd use 4164's modified so they work as 16's.. that way you have - less heat - lower voltage - higher reliability

I have them in stock at arcadeshopper.com



#5 acadiel OFFLINE  

acadiel

    Stargunner

  • 1,514 posts
  • www.hexbus.com
  • Location:USA

Posted Sat May 4, 2019 7:23 AM

I'd use 4164's modified so they work as 16's.. that way you have - less heat - lower voltage - higher reliability

I have them in stock at arcadeshopper.com

 

 

Thread:  http://atariage.com/...or-reliability/:)






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