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HP-41 contrast adjustment?



#12

Seeing the listing from the AlphaRom, it seems to be possible to adjust the contrast of the HP-41, is that so? Is this the only way?


#13

I think it's only possible with the halfnut models.


#14

HI Howard, guys;

as far as I read about, you are correct. Either full lower-case alphabet or contrast adjustment are only possible with the half-nut units. As an example, Angel's Sandbox ROM has headres that can only be fully read with halfnut units. And if I am not wrong, Angel's Sandbox ROM (would that be the Toolbox?) has a contrast adjustment function.

Best regards.

Luiz (Brazil)

#15

Is it possible to make a halfnut from a halfnut main board and a fullnut casing?


#16

If you swap out the daughter card and the mainboard, including LCD, together, I don't see why not.


#17

i think there are a few threads on this one here, but I think you are right - bascically one has to change everything. Tony Duell, aside from all the other gurus here, would know all about it I believe...

The one thing I'm not sure about is if the keyboard can stay. Also, changing the LCD - which has the display drivers included. might be a pain to do. ONe migh tbe better of selling the fullnut and purchasing a halvenut. The price-difference, even via ebay, should be somewhere between 0 and 35 USD...

Cheers

Peter

#18

Hi, Geir;

I have done such 'transplantation'. I have a halfnut HP41CV with a bad RAM (shows up only 63 registers) inside an original HP41C fullnut case. As mentioned in this thread, all of the inner package must be transplanted, LCD assembly included. Look at the picture below:

After removing the entire 'guts' from both calculators, it is necessary to cut out some small posts in the fullnut case (shown as black spots in the picture) prior to settle the halfnut main PCB. This is due to the fact that the halfnut main PCB does not have all small holes available in the fullnut main PCB. Appart from that, evertyhing else fits perfectly fine. The rounded-edge LCD frame is actually in the LCD assy itself, so it goes with the whole package.

Hopes this helps a bit.

Cheers.

Luiz (Brazil)

#19

Sandbox (CTRST, CTRST?, CNT+, CNT-) and Hepax (CTRAST or HEPAX 005) are the only two modules to my knowledge that have functions to adjust the contrast of LCD on halfnut models only.


#20

When contrast is adjusted, does it stay adjusted after the module is removed?


#21

yes.


#22

I tested once, and the contrast set is kept even after a [MEMORY LOST] procedure, module(s) inserted or not.

Just to add this bit...

Cheers.

Luiz (Brazil)


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