# C=Hacking

### Issue 10 (July, 1995)

Trivia
 Trivia Edition #13-18 are in this article. As you may know, these questions form part of a contest in which the monthly winner gets a prize (Thanks to my various prize donators). The whole thing is mainly just for fun, so please enjoy. Try your hand at Commodore trivia!!
Jim Brain
BFLI - New graphics modes 2
 FLI gave us more color to the screen, AFLI increased the horizontal resolution and color selection by using the hires mode. BFLI stands for 'Big FLI' and gives us 400 lines instead of the usual two hundred. AFLI and BFLI can be combined, but we are not going into that.
Pasi Ojala
Making stable raster routines (C64 and VIC-20)
 In this article, I document two methods of creating stable raster routines on Commodore computers. The principles apply for most 8-bit computers, not only Commodores, but raster effects are very rarely seen on other computers.
Marko Mäkelä
A Different Perspective, part III
 Yes!!! It's yet another article on 3D graphics! Even if you haven't been following this series, you can use this program. This time around we will write a completely general polygon plotter -- if you can type basic data statements, you can create a three-dimensional object out of polygons and rotate and project it to your heart's content. For the more technically inclined we will look at optimizations to the line routine, EOR-buffer filling, and more! Yow!
Stephen L. Judd, George Taylor
Second SID Chip Installation
 This article describes how to add a second sid chip for use in SidPlayer and other programs. As always, be extra careful when making modifications to your computer.
Mark A. Dickenson
SOLVING LARGE SYSTEMS OF LINEAR EQUATIONS ON A C64 WITHOUT MEMORY
 OK, now that I have your attention, I lied. You can't solve dense linear systems of equations by direct methods without using memory to store the problem data. However, I'll come back to this memory free assertion later. The main purpose of this article is to rescue a usefull numerical algorithm, "Quartersolve", and also to provide a brief look at the COMAL programming language and BLAS routines.
Alan Jones
The World of IRC - A New Life for the C64/128
 I've heard people talking about IRC. What is it? Why is it useful to me as a Commodore user? Bill "Coolhand" Lueck explains the hows and whys in this article.
Bill Lueck