The following warnings occurred:
Warning [2] count(): Parameter must be an array or an object that implements Countable - Line: 795 - File: showthread.php PHP 7.4.33 (FreeBSD)
File Line Function
/showthread.php 795 errorHandler->error




HP Forums / HP Calculators (and very old HP Computers) / General Forum v / Modifying the HP42S?

Post Reply 
Modifying the HP42S?
02-24-2018, 01:20 AM
Post: #1
Ken S Offline
Member
 		Posts: 72
Joined: Jan 2018
Modifying the HP42S?
I recently picked up an HP42S in fairly decent shape except for the LCD which is bleeding a bit at the top. I have already bought an HP17B with a good display (identical bezel) for next to nothing for a donor.

Since I will have to open it up I figured I would do the 32kb ram upgrade, I have found the correct chip and ordered a couple. Now I am wondering if it is worth changing the crystal to a 65.5360KHZ for the double speed while it is open. Are there any downsides to this? Will it drastically reduce battery life?

Are there any other modifications you would recommend? Any one figure out anything interesting to do with the other 28 pin chip mount?

Ken
Find all posts by this user
Quote this message in a reply
Post Reply 


Messages In This Thread
Modifying the HP42S? - Ken S - 02-24-2018 01:20 AM
RE: Modifying the HP42S? - Ken S - 02-26-2018, 02:37 AM
RE: Modifying the HP42S? - mfleming - 02-26-2018, 04:12 PM
RE: Modifying the HP42S? - Ken S - 02-27-2018, 12:28 AM
RE: Modifying the HP42S? - Sylvain Cote - 02-27-2018, 12:38 AM
RE: Modifying the HP42S? - Ken S - 02-27-2018, 04:02 AM



User(s) browsing this thread: 1 Guest(s)

Contact Us | The Museum of HP Calculators | Return to Top | Return to Content | Lite (Archive) Mode | RSS Syndication