USB power module and 41CL update

[JurgenRo]

(03-21-2019 08:17 PM)JurgenRo Wrote:  

(03-21-2019 11:15 AM)Diego Diaz Wrote:  Hi Juergen,

Along the years I've provided two different USB power solutions for the HP-41.

The simplest one is a bare USB (white) cable attached to a module housing with just power connection.

The other one is the USB-41 (black cable), which includes HP<>PC interface module allowing page transfer, printer emulation, 8 Clonix ROM pages and, of course, power connection too.

Both can power the HP-41 indefinitely as long as the USB port used is functional.

Hope this helps.

Diego.

Hi Diego,
thank you very much for the valuable note, I will pay attention!
One final question: should the USB power module be used with or without batteries inserted into the HP-41?

Thanks again and Best Regards,
Jürgen

... found the answer given by Diego on his homepage (sorry for the unnecessary question, Diego):

" ... As long as you have a USB port handy (or any other stable power source for that matter), there's no need to be messing around with external D-cells, adaptors or anything else.
In fact you don't even need the 41's N-cell battery pack in most cases, (see note on Halfnuts)."

"... NOTE on Halfnuts: Due to its internal circuit design, Halfnut may show the BAT annunciator permanently ON, with the power arrangement described above, if no battery pack is present; and will more likely fail to operate the Card Rader showing the "LOW BAT" message on the display. Normal operation will perform as expected though (even if no battery pack is present)"

Juergen