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HP-48 FRAM Cards
08-27-2016, 11:32 AM
Post: #55
RE: HP-48 FRAM Cards
(08-26-2016 04:13 PM)Ron Ross Wrote:  Do the FRAM chips share the same footprint and pinout assignments of the previous RAM chips used by earlier 48GX ram cards? It would be great if that were the case. Simply buy an older card and replace the RAM chip with a FRAM chip. It would also be a nice way to upgrade an older card.
There are some subtle differences, but, yes, many FRAM chips use pinouts compatible with SRAM chips. However, the HP48 uses 5V CMOS technology and most modern FRAM chips are 1.8V to 3.6V, so you'll have to add level translators to use them in the HP48. I still found a few 5V FRAM chips, but they seem to be older generations and lower capacities only.

Greetings,

Matthias


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Messages In This Thread
HP-48 FRAM Cards - JDW - 07-16-2016, 02:59 AM
RE: HP-48 FRAM Cards - Dave Frederickson - 07-16-2016, 04:15 AM
RE: HP-48 FRAM Cards - JDW - 07-16-2016, 04:21 AM
RE: HP-48 FRAM Cards - matthiaspaul - 07-16-2016, 04:39 PM
RE: HP-48 FRAM Cards - Dave Frederickson - 07-16-2016, 09:18 PM
RE: HP-48 FRAM Cards - Michael Lopez - 07-16-2016, 07:07 AM
RE: HP-48 FRAM Cards - cruff - 07-16-2016, 12:20 PM
RE: HP-48 FRAM Cards - JDW - 07-16-2016, 12:24 PM
RE: HP-48 FRAM Cards - JDW - 07-17-2016, 09:23 AM
RE: HP-48 FRAM Cards - snrowe - 07-23-2016, 12:03 AM
RE: HP-48 FRAM Cards - JDW - 07-23-2016, 12:19 AM
RE: HP-48 FRAM Cards - snrowe - 07-23-2016, 12:51 AM
RE: HP-48 FRAM Cards - JDW - 07-23-2016, 12:58 AM
RE: HP-48 FRAM Cards - snrowe - 07-23-2016, 01:04 AM
RE: HP-48 FRAM Cards - Dave Frederickson - 07-23-2016, 01:40 AM
RE: HP-48 FRAM Cards - snrowe - 07-23-2016, 02:37 AM
RE: HP-48 FRAM Cards - Sylvain Cote - 07-23-2016, 02:45 AM
RE: HP-48 FRAM Cards - matthiaspaul - 07-23-2016, 05:10 PM
RE: HP-48 FRAM Cards - JDW - 07-23-2016, 10:56 PM
RE: HP-48 FRAM Cards - matthiaspaul - 07-24-2016, 02:28 AM
RE: HP-48 FRAM Cards - Dave Frederickson - 07-24-2016, 04:29 PM
RE: HP-48 FRAM Cards - matthiaspaul - 07-24-2016, 06:52 PM
RE: HP-48 FRAM Cards - Dave Frederickson - 07-23-2016, 12:46 AM
RE: HP-48 FRAM Cards - snrowe - 07-23-2016, 01:00 AM
RE: HP-48 FRAM Cards - Dave Frederickson - 07-23-2016, 01:22 AM
RE: HP-48 FRAM Cards - snrowe - 07-23-2016, 01:35 AM
RE: HP-48 FRAM Cards - JDW - 07-23-2016, 02:01 AM
RE: HP-48 FRAM Cards - JDW - 07-23-2016, 02:57 AM
RE: HP-48 FRAM Cards - snrowe - 07-23-2016, 03:14 AM
RE: HP-48 FRAM Cards - JDW - 07-23-2016, 03:50 AM
RE: HP-48 FRAM Cards - Dave Frederickson - 07-23-2016, 03:53 AM
RE: HP-48 FRAM Cards - JDW - 08-10-2016, 01:54 PM
RE: HP-48 FRAM Cards - matthiaspaul - 08-17-2016, 09:38 AM
RE: HP-48 FRAM Cards - JDW - 08-16-2016, 01:56 AM
RE: HP-48 FRAM Cards - matthiaspaul - 08-18-2016, 09:56 AM
RE: HP-48 FRAM Cards - JDW - 08-19-2016, 12:06 AM
RE: HP-48 FRAM Cards - Dave Frederickson - 08-19-2016, 12:20 AM
RE: HP-48 FRAM Cards - JDW - 08-19-2016, 12:32 AM
RE: HP-48 FRAM Cards - Dave Frederickson - 08-19-2016, 02:15 AM
RE: HP-48 FRAM Cards - matthiaspaul - 08-20-2016, 11:52 AM
RE: HP-48 FRAM Cards - Ron Ross - 08-16-2016, 01:04 PM
RE: HP-48 FRAM Cards - JDW - 08-16-2016, 01:27 PM
RE: HP-48 FRAM Cards - Ron Ross - 08-16-2016, 04:14 PM
RE: HP-48 FRAM Cards - JDW - 08-16-2016, 11:43 PM
RE: HP-48 FRAM Cards - JDW - 08-19-2016, 02:21 AM
RE: HP-48 FRAM Cards - JDW - 08-21-2016, 11:44 PM
RE: HP-48 FRAM Cards - Han - 08-22-2016, 04:10 PM
RE: HP-48 FRAM Cards - matthiaspaul - 08-22-2016, 07:32 PM
RE: HP-48 FRAM Cards - gege - 08-25-2016, 03:19 PM
RE: HP-48 FRAM Cards - matthiaspaul - 08-25-2016, 07:38 PM
RE: HP-48 FRAM Cards - JDW - 08-25-2016, 11:52 PM
RE: HP-48 FRAM Cards - Ron Ross - 08-26-2016, 04:13 PM
RE: HP-48 FRAM Cards - matthiaspaul - 08-27-2016 11:32 AM
RE: HP-48 FRAM Cards - JDW - 08-27-2016, 12:21 AM
RE: HP-48 FRAM Cards - gege - 08-27-2016, 09:36 AM
RE: HP-48 FRAM Cards - JDW - 08-29-2016, 12:21 AM
RE: HP-48 FRAM Cards - gege - 08-29-2016, 05:32 AM
RE: HP-48 FRAM Cards - JDW - 08-29-2016, 05:35 AM
RE: HP-48 FRAM Cards - gege - 08-29-2016, 05:36 AM
RE: HP-48 FRAM Cards - Han - 03-23-2017, 02:45 PM
RE: HP-48 FRAM Cards - Hans Brueggemann - 03-23-2017, 06:44 PM
RE: HP-48 FRAM Cards - Chris Dreher - 03-23-2017, 04:06 PM
RE: HP-48 FRAM Cards - EugeneNine - 03-23-2017, 04:58 PM
RE: HP-48 FRAM Cards - JDW - 03-23-2017, 11:54 PM
RE: HP-48 FRAM Cards - EugeneNine - 03-24-2017, 12:11 PM
RE: HP-48 FRAM Cards - Gary Cray - 07-16-2017, 06:47 PM



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