Woodstock Low Power

[PANAMATIK]

A Low Power circuit for all "Woodstock" calculators!

This printed circuit board will become a complete replacement for the woodstock calculator electronics. It includes the ACT (Arithmetic Control Timing chip) and display driver functionality. Thus it will replace all chips of the original Woodstock PCB including the switching power supply and make a modern version of these LED calculators. It will consume remarkable 5-18 mA when switched ON, compared to 110-180 mA of the original calculator. And when switched off it consumes only 100 uA and keeps all data like an LCD calculator for years. The calculator will wake up by key press or by the ON/OFF switch.

The firmware contains all features of the new ACT chip, described in the ACTManual.

Furthermore it contains an accurate Real Time Clock with date, time, stopwatch and alarm time capability, including a Buzzer.

Flash ROM size is 512kB!!! This is enough to keep all ROM images of all Classic, Woodstock and Spice calculators including the HP-67 in one hardware, you can switch between all calculator models just by key press. And there is plenty of space for your programs.

It has full 7-segment alphanumeric capabilities and can show your program steps in plain text. Also the programs of your program library can be given names.

A GPS module can be connected and Infrared Printing to the HP82240B is available.



The layout is nearly finished, as you can see in the above image. It will be inserted below the LED display board and drives its digits and segments directly. It takes the space of the original display driver chips. I hope to get the prototype boards in two weeks.

Price will be 149,- Euro + shipping, including Infrared printing, without GPS module.

Bernhard