6502/cc65
1
0
Fork 0
mirror of https://github.com/cc65/cc65.git synced 2024-12-28 06:30:16 +00:00
Code Issues Projects Releases Wiki Activity

add DIO section

Browse Source 
git-svn-id: svn://svn.cc65.org/cc65/trunk@3398 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cpg 2005-02-20 21:02:33 +00:00
parent ec579681e7
commit f519c43a74
1 changed files with 14 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
doc/atari.sgml
View File

@ -185,6 +185,15 @@ platform. There is a static driver you can use.
<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>
@ -192,7 +201,7 @@ platform. There is a static driver you can use.
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
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.
<p>
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
load chunk header data. Also an assembly source file needs to be
created which defines the contents of the new EXE header and the
second load chunk header.
new memory areas and segments to hold the new EXE header and the
header data for the second load chunk. Also an assembly source file
needs to be created which defines the contents of the new EXE header
and the second load chunk header.
<p>
<p>
This is a modified cc65 Atari linker configuration file (split.cfg):