Firmware V31 Fix for Battery Problem

This is the place to discuss the usage of DM1x/DM41 machines and to share any tips & tricks you may have stumbled across.

If discussing a specific model, please ensure that you prefix topic subjects with the model number this way:

[DM41] How to change the number of program steps available
Post Reply
Posts: 1
Joined: Thu Sep 16, 2021 8:35 pm
Location: FAIRFAX VA

Firmware V31 Fix for Battery Problem

Post by JPL »

I have a Mac and am using Chrome. I am a very basic Mac user: I didn’t even know that “Terminal” existed or what it was for. Fact is, I still don’t!
Please help me fix my wonderful 15L by the simplest possible instructions on how to get V31 Firmware into my calculator. I don’t know what a serial port emulator is. When I try now, a whole lot of code appears in my computer screen but despite my calculator being connected I can’t get the new code into the calculator. I’m burning through batteries every few months. HELP!!
Posts: 15
Joined: Wed Oct 04, 2017 12:39 am

Re: Firmware V31 Fix for Battery Problem

Post by axd »

A Mac user could help this user here with Jitsi?
Apart from connecting the device and entering serial console mode, the procedure can be followed via Jitsi.
DM15,41, HP15C/48SX/42S/32S
Elektronika, Casio, Facit, Sorobans...

Preserve the HP-42S software
Posts: 165
Joined: Fri Oct 05, 2018 8:33 pm
Location: Cambridge, UK

Re: Firmware V31 Fix for Battery Problem

Post by cdmackay »

It's not all that hard, although if you've no experience at all with UNIX cmdline, etc, then it may seem so, but we ought to be able to help you through that.

But, first: what are you doing exactly, that results in "a whole lot of code appears in my computer screen"?

You should be trying to follow the instructions here: ... e_on_macos

but we can walk you through it one bit at a time, if that helps. Or have you already managed some of that? If so, how much?

If not, to start, we need to see what MacOS version you are running (to see if you need to install a device driver). Do you know? If not, select About this Mac, from the apple icon in the LHS of the top menu bar.

It should tell you:

macOS <something>
Version <something>
Cambridge, UK
41CL/DM41X 12/15C/16C DM15/16 71B 17B/BII/bII+ 28S 42S/DM42 32SII 48GX 50g 35s 30b/WP34S Prime G2
& Casios, Rockwell 18R :)
Post Reply