Upgrade HP 48G 32K RAM chip



#2

I want to upgrade the 32K chip in my 48G. However all the information that I find on the net about doing the upgrades (to 128K, 256K etc) have been done with chips such as the "128K (8bit) static ram chip SMD package (SO32)
(HM628128LFP-8 (Hitachi) or KM681000BLG-7L (Samsung))". However it seems that these parts are not readily available - being older model chips, I take it that they have been replaced with newer and larger chips. Can anybody tell me what 'newer' chips I could use that is readily available, that I can just substitute right in place of the chips that are used in the 128K-256K upgrades? Will a "131810 IC,SRAM,628128LP" work (it is 1028K I think). Any help is much appreciated. Thanks

Edited: 17 Oct 2005, 8:29 p.m.


#3

On the contrary, they're still around as new. 128K x 8 - M5M51008DFP70HIA0-ND from http://digikey.com $4.50 each, in stock.

Edited: 17 Oct 2005, 10:08 p.m.


#4

Thanks very much for that!! Would you happen to know if any on the larger chips can be substituted. For example, to upgrade to 256K requires piggy backing 2 128Ks.....can you put a single 256K on there (if they make them)? If you can, do you know what chip that is? Thanks again


#5

There are a number of sites listed by www.hpcalc.org on how to upgrade your 48g. I did one with a 128K, it came out all right except I could not get the case to close right again. I had a friend who was an expert machinist drill four very small recessed screw holes at the corners of the case so I could reassemble it tightly. Now I can also take it apart again easily should I wish.

Later I bought a 48g that had been upgraded to a 1 MB memory by Cynox from Germany, outstanding. I'm not sure if they're still doing this, you might want to visit their website. Best of luck.

Edited: 18 Oct 2005, 9:43 a.m.


Possibly Related Threads...
Thread Author Replies Views Last Post
  42S with nonvolatile RAM Lyuka 5 1,186 12-13-2013, 08:52 AM
Last Post: Lyuka
  Best way to test HP-71B RAM modules (the 32K/96K ones etc.)? Philippe Lasnier 4 1,091 09-25-2013, 09:54 AM
Last Post: Philippe Lasnier
  HP 2225D+ RAM failure/replacement Luca 4 861 09-10-2013, 01:46 PM
Last Post: Luca
  Questions about building a RAM card for hp 48 Waon Shinyoe (China) 0 477 07-09-2013, 09:53 PM
Last Post: Waon Shinyoe (China)
  Riemann's Zeta Function update (HP-28S, HP-48G/GX/G+, HP-49G/G+/50g) Gerson W. Barbosa 0 456 06-30-2013, 01:01 AM
Last Post: Gerson W. Barbosa
  OT: DIFFERENTIAL EQUATIONS using the HP-48G/GX Ivan Rancati 2 594 06-04-2013, 04:11 AM
Last Post: Frank Boehm (Germany)
  Almost totally OT: Looking for Sharp EL-9900G ROM upgrade Marcus von Cube, Germany 3 637 03-03-2013, 09:35 AM
Last Post: Marcus von Cube, Germany
  HP10BII+ question (ROM upgrade is possible?!?) Csaba Tizedes (Hungary) 6 912 02-21-2013, 05:19 PM
Last Post: Eric Smith
  ACT CHIP aj04062 5 766 01-27-2013, 02:11 PM
Last Post: Eric Smith
  Able to set HP 48G axis tick marks at integers? Randal B 1 446 01-24-2013, 12:40 AM
Last Post: Chris Dreher

Forum Jump: