HP Forums
RAM-Box, HEPAX, 41-CY... Power requirements. - Printable Version

+- HP Forums (https://archived.hpcalc.org/museumforum)
+-- Forum: HP Museum Forums (https://archived.hpcalc.org/museumforum/forum-1.html)
+--- Forum: Old HP Forum Archives (https://archived.hpcalc.org/museumforum/forum-2.html)
+--- Thread: RAM-Box, HEPAX, 41-CY... Power requirements. (/thread-49155.html)

RAM-Box, HEPAX, 41-CY... Power requirements. - Diego Diaz - 12-17-2003

Hi all,

I'd like to know how much power do those devices need, how long will a fresh battery set last with "normal" usage...

I've been told that they're quite "hungry", but have no accurate info (measurements) about it.

Thanks in advance and best whishes.


Re: RAM-Box, HEPAX, 41-CY... Power requirements. - Ángel Martin - 12-18-2003

Diego et at,

My only experience is with the Advanced HEPAX Module (16k RAM). A new battery set will last from three to four weeks when using it frequently (ROM copies, Hepax file management, etc), and will last for about six weeks if only doing a moderate usage of it (MCODE programming, etc).

Not wonderful, but a small price to pay for the wondrous features and capabilities of this device, really a complete RAMBOX fit into the standard module size.

I understand that the CY and RAMBOXES have an auxiliary battery, which I imagine should alleviate this heavy requirement.


Re: RAM-Box, HEPAX, 41-CY... Power requirements. - Werner (Germany) - 12-18-2003


the auxiliary battery of the W&W RAMbox is only used when the calculator battery is empty. So it is only used for safety reasons and if you remove the RAMbox from the calc.

It is a lithium(or so) cell which has only little capacity, nevertheless it holds for many years as it is not really used.

I did not check the power consumption of the RAMbox II yet. But HEPAX really needs a lot. Even in a switched-off calc the capacitor is down much earlier than without HEPAX (if batteries are removed).

But I aggree: HEPAX may be the best device ever designed for HP41 ! The OS is much better than that of the W&W RAMbox ...

Best regards,


Re: RAM-Box, HEPAX, 41-CY... Power requirements. - Diego Diaz - 12-18-2003


For some reason (it may be my crazy head) my previous post in this thread has fallen into nowhere land :-o

It was only intented to thank you both you comments and info on the subject.

I was determined to keep my next project power requirement as low as it can be.

Much work ahead, now it's time for a little rest.

Thanks again and Merry Xmas.