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teenix · (This post was last modified: 05-13-2021 06:37 AM by teenix.)

Hi all,

It is a bit early but I wasn't sure when I would get it going. There was (is) no rush but due to work delays, component supply delays etc etc, it took about 6 months to get going.

It is an A1 sized poster featuring working HP-35bug/35/45/55/65/67/70/80 calculators.

The keys aren't mechanical but are touch sensors that work by touching over the keys on the glass front panel.

The display features the full 15 digits with the decimal point in the centre of the CDEG LED segments just like the real Classic displays.

It doesn't have external memory storage but can store up to 7 programs total for the 55, 65 and 67.

The calculator menu is accessed the same as my CPU replacement boards and has wired connectivity to a PC program via FTDI and USB port to transfer data and reprogram.

The poster print is just an idea and cannot be sold as I don't own the photos, but is ok for private use. I just created it in Publisher and had it printed. It also has a feint enlarged HP-35 ACT chip overlaid on the base of the image.

To make it a bit more versatile, it has a digital clock in 12/24 hour mode and because the power supply is a simple AC mains transformer, the clock timing is derived from the mains frequency and can be programmed for 50 or 60Hz operation.

Having the other models built in means any of the available calculators can have a working poster made up if desired. I've been thinking of a oversized card transport for the 65 and 67 but may be overkill.

Lots of wiring so a horrible thing to assemble :-)

cheers

Tony