Re: Expiring EPROM's inHP's? Message #2 Posted by Eric Smith on 14 Apr 2006, 11:31 a.m., in response to message #1 by Marta
The HP-41 and Voyagers use masked ROMs. All plug-in ROMs that HP sold for the HP-41 used masked ROMs. Some third-party plug-ins for the HP-41 used EPROMs.
The HP 48S[X], HP 48G[X], HP 48G+, and HP 38G used masked ROMs. However, plugin cards for the SX and GX may use EPROMs.
The HP 49G and HP 49G+ use flash memory, which has roughly speaking the same data retention characteristics as EPROM.
The HP 39G, 40G, and 48GII probably use masked ROM, but it's possible that they might use OTP EPROM.
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