HP97 The journey begins

[teenix]

Hi all,

Here's a pic of the working Spice - 31E model selected. The blue glow is the battery charge LED with the calculator connected to a USB port. The new display/keyboard circuitry seems to be working ok and has a nice bright display. Thanks for the help :-)

I am going to fully charge the battery and test the low battery indicator. There might be a circuit tweak needed if it comes on too early.

The Continuous Memory circuit has had a few issues, but seems ok. Thanks to Harald for some help.

I thought I might list the features now

Supported models 31E, 32E, 33C, 34C, 37E and 38C

Plug and play - no soldering required
New membrane keypad assembly
BT connectivity
LiPo battery powered
Internal USB battery charger, runs calculator as well
Continuous Memory storage - requires no battery power - new circuit saves an IC too :-)
HP34C has random number generator - can be used in programs
Decimal/Binary/Hex/Octal convertor
Storage for 300 programs each for 33C 34C and 38C
Text editor for creating names for stored programs
Option for display program text instead of numbers
Battery backed real time clock with alarm, +/- 5 PPM
Separate count up and count down timers with alarm
Selectable DDMMYYYY or MMDDYYYY date format
Printer interface to PC, same font as Topcat printers
Menu activated right switch (in case user's model does not have one)
Selectable key debounce
Menu selectable US or Euro mode
Beeper - selectable OFF/ON Loud/Soft
Menu selectable sleep function
Power on model display
Temperature display
PC interface - transfer options and programs - compatible with Teenix Spice emulator
Reprogrammable through serial port or external programmer

cheers

Tony