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Digital Calculator schematic?

I was wondering if anyone could point me in the right direction to making a 3 digit calculator with a subtract feature, a clear feature, add feature by 10 and 100 with a digital display. I would like to basically make a backwards counter set by a mechanical switch with a reset button and the ability to add a hundred or 10s. I know the easy way would be to utilize a standard calculator but wondering how hard it would be to build that from scratch. Any ideas?
For what I want to design it for it would be worth it as long as it’s not going to cost an arm and leg. I am somewhat familiar with programmable ICs and I have designed programs with flowcode. Just for testing purposes I’m gonna tear apart a calculator and see what I can do with that. I would be able to add a specific number and have the switch set up to subtract one each time it is triggered.

Has anyone got a BFP at 9 DPO on Clearblue Digital? Or before 14 DPO? Or are they not sensitive enough?

digital library system scope/functionality !?

we are a group of 3 members doing our final year project of BSc-CS (hons 4 years )
we have taken the project to build a digital library system.
please tell me what functionality you think the application/software should have ?
our basic scope is as under:
store data
search data
browse digital content

Which is the better way to transfer images from Digital camera to computer?

Hi i have a doubt,i have a sony cyber shot digital camera, i have a card reader,after taking shots via camera i will take memory card from camera and insert into card reader and tranfer files to pc,but i’m doubt that by doing these whther it harm the memory card and by frequent opening and closing of the slot cap of digitel cam lose it’s spring action,what yo usay about it?
or i use cable connected in camera’s usb port to ps’ usb port?????????

Western Digital 500GB Elements cheap?

Hi, Iv’e been looking around for a portable hard drive, and have found the Western Digital 500GB Elements portable hard drive to fit everything I want. But everywhere iv’e looked it’s cost quite abit. I know PC world had a sale on in January and it was only £53 but sadly I missed this. Does anyone know a place that I might be able to pick it up cheaper? I’m in the UK. Thanks.

Can any antenna transmit digital data directly? If not why?

I have heard people saying that an antenna only transmits analog waveforms. why? If so then how is digital data transmitted? Is pulse waveform also an analog waveform?

Where would one find a digital camera for stereo 3-d photography?

Something for point and shoot that takes both right and left eye images silmulteaneously. do they even make such things?

What is the difference between Digital Camera & D-SLR?

Which company’s camera is best?

what to do if my windows xp does not have enough software to play dolby digital 5.1surround audio?

my xp software is quite old…. now i face problem while playing any dvd with dolby digita 5.1 surround audio…….please be quick to answer…

Lomo cameras & Digital single-lens reflex camera?

which one would you recommend ?