abakus.jpg Abakus is a tiny calculator program. Yeah, right, yet another calculator - as if the world needed any more of those. Well, I didn't care - I needed one. All the calculators out there either didn't have the functionality I needed or were simply too bulky to run them in the background all the time. Remember, back then, a RAM size of 1 MB was considered large...

Many of my previous projects were written in assembly language, but this time I wanted to use Borland's excellent Turbo C compiler - which helped me to learn more about C and GEM programming. The resulting code packs all the required functionality into 9 KB:

  • Binary, decimal and hexadecimal calculations
  • "Natural" input, i.e. using standard mathematical rather than reverse Polish notation
  • Can send result as text to the active application
  • Adds, subtracts, divides and multiplies
  • Sign change, memory
  • Doubles as a program and as a GEM accessory

Yes, I'm sure you could strip this down a lot by using assembly language. But the point was to convince myself that even when using Turbo C, it was still possible to write reasonably small code.

When asked for a TWiki account, use your own or the default TWikiGuest account.

to top

You are here: Atari > Abakus

r1.2 - 07 Feb 2005 - 07:53 - ClausBrod to top


  • My links
  • Show me topics of interest



TWiki Web TWiki Web Home Changes Topics Index Search

TWiki Webs Atari Blog Main OneSpaceModeling? Sandbox TWiki TWiki Webs Atari Blog Main OneSpaceModeling? Sandbox TWiki


Copyright © 1999-2024 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding TWiki? Send feedback