From: "John M. Aldrich" Newsgroups: comp.os.msdos.djgpp Subject: Re: Geting 8x8 text from rom? Date: Sun, 14 Dec 1997 21:20:39 +0000 Organization: Two pounds of chaos and a pinch of salt Lines: 36 Message-ID: <34944DA7.73C3@cs.com> References: <34938c5f DOT 0 AT pusher DOT student DOT adelaide DOT edu DOT au> Reply-To: fighteer AT cs DOT com NNTP-Posting-Host: ppp243.cs.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit To: djgpp AT delorie DOT com DJ-Gateway: from newsgroup comp.os.msdos.djgpp Precedence: bulk Matthew wrote: > > Im rather new to DJGPP so please excuse my ignorance here > > I would like to know how I would use farnspeekb for the following address. > 0xF000FA6E which contains the 8x8 font for mode 13h in rom. The only > example close to farnspeekb I can find is for writing to the screen > ie _farnspokeb(0xA0000 + line_offset, color); > Im used to writing 0xA0000000 for the screen address! > How do I write the adress 0xF000FA6E for use with farnspeekb? You're making the same mistake that a lot of people do when switching to DJGPP; namely, assuming that all the world operates with 16-bit pointers. This is not true; it's just a sad myth propagated by textbooks that teach you Borland C and nothing else. The address 0xF000FA6E is translated into a segment:offset pair by a real mode compiler. The equivalent 32-bit memory address is 0xFFA6E, AFAIK. (Somebody correct me if I'm wrong; I'm not used to thinking in 16-bit terms. :-) ) In the same vein, the 0xA0000000 16-bit pointer translates into an absolute 32-bit address of 0xA0000. Once you get used to it, you'll find that 32-bit addressing is a _lot_ simpler than the old way of doing things. See chapters 10, 17, and 18 of the DJGPP Frequently Asked Questions list for more eye-opening facts. :-) -- --------------------------------------------------------------------- | John M. Aldrich | "Courage is the complement of fear. | | aka Fighteer I | A man who is fearless cannot be | | mailto:fighteer AT cs DOT com | courageous. (He is also a fool.)" | | http://www.cs.com/fighteer | - Lazarus Long | ---------------------------------------------------------------------