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Whopping 4MegaByte for HP48G?

For those Do It Yourselfer, the best way to step up the power without the steep cost for buying a new calculator.

NEWS!HP Unofficially released the New calculator: The HP49G.

NOTE: The documents contained in this page is for informational purpose only. I am obviousely not the expert nor the author for these document. Therefore I cannot provide any warranty expressed or implied or gurantee on the accuracy of the information. This is my hobby and please be understandable that I cannot answer all questions. Based on time allowed, I will try my best to reply. It is very important that the reader must make all decision on his or her own and take any action may caused by this process prior to the upgrade. Therefore I have stated it.

This page will be asked frequently on topics on downloading files. Click on the RIGHT mouse button to use the command "Save LinkAs" to download any file of desire.

CABLES? CD CABLES! Real CABLES!!!!!!!

Link to my Cable Special Offers

Use Windows to Transfer Files

MUST SEE PAGES

Adrian Drury - did an excellent COLOR PHOTO page on How to Open Your HP Another link to How to Open Your HP without cosmatics damage to your one and only faceplate by gaining entrance from the back of the calculator. A Must see for all Upgrader!

Philippe Teuwen did a comprehensive HP48 Hardware Page contained detail information on Yorke CPU, Memory and much Hardware informations. He also did a simplied document on how to install 384k in your HP. HPUP384K.zip[126.5k] is the file you will need. You will need Microsoft Word and JPG viewer to open. Also in the text format HPUP384K.TXT[2.1k]. Document on how to take it to the maximum 4MB: HP48TO4M.TXT[3.0k] . Not Tested Yet

Stefano Garavaglia has a detailed document on how to upgrade to 768k! hpup768k.txt[6.2k]

St�phane Grundschober (or here in France ) has a good and clear picture on a Home Made Ramcard Here!(New Server)[Web Page] or Here!(Mirror Site)[Mirror Page]

SRAM Chip Source

Marshell Industries Inc. (800) 261-9602 has a wide selection of SRAM ;Chips. I recommand the HM628128BLFP-8SL SMD by Hitachi or TC551001BFL-70L by Toshiba. Pick 100ns or faster chips will perform excellently in the G or GX. There is a Minimum of $50 per order limit. Marshall offers free sample to qualified companies / employees (Total Sample value must be less than $10).

A quick link to the SONY SRAM Chip Page in Marshall.
A quick link to the NEC SRAM Chip Page in Marshall. UPD431000AGW-70L = $3.55USD [March 1999] More infomation on this chip PDF format from NEC Site
A quick link to the Hitachi SRAM Chip Page in Marshall. HM628128BLFP-8SL = $5.14USD [March 1999] More infomation on this chip from Hitachi Site
A quick link to the Toshiba SRAM Chip Page in Marshall.

A Quick link to the RAM chip pin configuration. SRAM.GIF [5.4k] from Hitachi Site

Mouser Electronic (800) 346-6873 too carry SMD 128k SRAM only from NEC but no minimum on orders either. Very Competitive price. Order by toll-free phone number provided above. Either parts would work fine.

   Part Number       Package             Description         Price
   ================  ======== ============================= ========
   551-431000AGW70L   SO-32    1M (128K x 8) CMOS SRAM 70nS   4.80 
   551-431000AGW85L   SO-32    1M (128K x 8) CMOS SRAM 85nS   4.80
                                                       [March, 1999]

Jameco Electronics (800) 831-4242 is another prestigious company that carry SMD 128k SRAM only from Hitachi, no minimum on orders. Slightly higher in price. That chip can be found Here. $5.75[March, 1999]

DigiKey (800) 344-4539 is another prestigious company that carry SMD 128k SRAM only from Toshiba but no minimum on orders. Slightly higher in price. The 128k Chip can also be found Here type SRAM and look for

   Undefined Family / Catagory => TC551001BFL-70-ND $6.75 [March, 1999]

Still want more? Here is all the Electronics Distributors that is on Yahoo's List.

Documentation Source

The Ever Famous 48gs256k.zip[50.3k] for people need 128 or 256k of memory (use Save Link to copy.) FromHP Site.
I have made an Excel 5.0 Spreadsheet of the HP 48 Port I/O pins. portinfo.zip. [5.8K] (Need Excel 5.0 or Higher to open.) Or the GIF file portinfo.gif[19.2k]
The upgrade instruction inclueded in the above Zip file. Upgrade.txt [49.9k] Text format only From HP Site.
A much older version of the Upgrade.txt file. Was written for Step up the SX monsters: sxram.doc [28.7k] This is excellent for putting switches for banks. From HP Site.
A Layout of the RAM Card in ZIP format. ramcard.zip[201.9k] (use Save Link to copy.) See the Ghostscript utility to print out the circuit schematics if you do not have a postscript compatiable printer. ie HP 4ML. (use Save Link to copy.)
A Quick link to the SRAM chip pin configuration. SRAM.GIF[5.4k] from Hitachi Site
A link to Hitachi's 128k SRAM Page for Specs and pin configuration. HM628128 from Hitachi Site
Another version on how to open the HPs from the front or from the back. Apart48.txt [22.2k]2 parts. Text format only
A document that discussed about some third party RAM card and the electrical behavior. memcards.txt[22.2k] from the HP CalculatorSite

Ghost Script Utility

This Utility is to help PC Users who does not own a PostScript CompatibalePrinter. The FTP sites for practically all platform: http://www.cs.wisc.edu/~ghost/

Mini instruction: Download all the zip file to a temporary directory on a local hard drive. Unzip the first file (gsview21.zip) in the same directory and run setup.exe after unzipping. Follow the directions. (The setup.exe is compressed in the gsview21.zip.)

1. gsview21.zip [1188k]

2. gs403w32.zip [471k]

3. gs403ini.zip [677k]

4. gs403fn1.zip [1142k]

5. gs403fn2.zip [1052k]

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