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From: goodenough@vogon.DEC (Jeff Goodenough, IPG Reading DEC-UK)
Newsgroups: net.micro.cbm
Subject: Discovering C64 'secrets'
Message-ID: <1745@decwrl.DEC.COM>
Date: Mon, 17-Mar-86 20:24:05 EST
Article-I.D.: decwrl.1745
Posted: Mon Mar 17 20:24:05 1986
Date-Received: Wed, 19-Mar-86 01:15:35 EST
Sender: daemon@decwrl.DEC.COM
Organization: Digital Equipment Corporation
Lines: 23

Marco, maybe you didn't see the second posting I made of the raster interrupt
code.  I was told the first attempt was incomplete.  The instructions
surrounded by [ ] are optional, and show how to set the bitmap into
multicolour mode.  If you want the bitmap in hires mode, you leave these
instructions out.

What you really need to do is catch the first tram into town, and find a
computer store that has the Commodore 64 Programmer's Reference Guide.
This will give you a whole load of information about routines like CHROUT
and how to call them.  It also gives detailed information about programming
the display chip (bitmap, user-defined characters, sprites etc.).  I can't
stress enough how important this book is if you want to do serious
programming.

But even this book doesn't tell you everything.  Look around for a book
with a title like "C64 Whole Memory Guide", or "C64 ROM listings" which
has an annotated disassembly of the Kernel and BASIC ROM's.  This will
enable you to find routines for doing Floating Point etc.

If you mail me a short routing from ihnp4 or similar, I'll mail you the
raster interrupt code directly.

Jeff.