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add DIO section

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git-svn-id: svn://svn.cc65.org/cc65/trunk@3398 b7a2c559-68d2-44c3-8de9-860c34a00d81
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cpg
2005-02-20 21:02:33 +00:00
parent ec579681e7
commit f519c43a74
1 changed files with 14 additions and 5 deletions
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19
doc/atari.sgml
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@@ -185,6 +185,15 @@ platform. There is a static driver you can use.
<sect>Limitations<p> <sect>Limitations<p>
<sect>DIO implementation<label id="dio"><p>
The Atari supports disk drives with either 128 or 256 byte sectors.
The first three sectors of any disk are always 128 bytes long though. This is
because the system can only boot from 128 bytes sectors.
Therefore the DIO read and write functions transfer only 128 bytes
for sectors 1 to 3, regardless of the type of diskette.
<sect>Other hints<p> <sect>Other hints<p>
@@ -192,7 +201,7 @@ platform. There is a static driver you can use.
These are defined to be Atari + number key. These are defined to be Atari + number key.
<sect1>Reserving a memory area inside the program<label id="memhole"><p> <sect1>Reserving a memory area inside a program<label id="memhole"><p>
The Atari 130XE maps its additional memory into CPU memory in 16K The Atari 130XE maps its additional memory into CPU memory in 16K
chunks at address &dollar;4000 to &dollar;7FFF. One might want to chunks at address &dollar;4000 to &dollar;7FFF. One might want to
@@ -226,10 +235,10 @@ header must be discarded. It will be replaced by a user created
one. one.
<p> <p>
The user needs to create a customized linker config file which adds The user needs to create a customized linker config file which adds
new memory areas and segments to hold the new EXE header and added new memory areas and segments to hold the new EXE header and the
load chunk header data. Also an assembly source file needs to be header data for the second load chunk. Also an assembly source file
created which defines the contents of the new EXE header and the needs to be created which defines the contents of the new EXE header
second load chunk header. and the second load chunk header.
<p> <p>
<p> <p>
This is a modified cc65 Atari linker configuration file (split.cfg): This is a modified cc65 Atari linker configuration file (split.cfg):