====== File Deconversion ======
Using cc65 together with an emulator gives in general excellent turnaround times. But when it comes to GEOS development the manual deconversion of the CONVERT file generated by cc65 into a GEOS file quickly becomes very cumbersome. Therefore it is desirable to replace the explicit deconversion done using CONVERT 2.5 (for GEOS 64/128) or CONVERT.SYSTEM (for Apple GEOS) with an implicit deconversion done by the tool used to write the CONVERT file to the disk image.

===== GEOS 64/128 =====
The [[http://www.viceteam.org/vice_10.html|VICE c1541 tool]] has a //geoswrite// command that is supposed to do the trick, but at least for me the one from WinVICE-2.2-x86.zip just crashes when I try that command. In contrast [[http://sta.c64.org/sc.html|The Star Commander]] works fine for me but is a little complicated to use as command line tool. In order to write i.e. the file **test.cvt** to the disk image **geos.d64** you need a text file containing:
<file text sc.txt>
set ConfConvFileName False
set AutoOver All
copy test.cvt Disk:geos.d64\test
</file>
Then you can use this command:
<code>
sc.exe /cmd @sc.txt
</code>

===== Apple GEOS =====
By the time of this writing (10/2012) CONVERT file deconversion hasn't made it into the //Stable Release// of [[http://applecommander.sourceforge.net/|AppleCommander]]. However the latest //Interim Release Candidate// contains it. In order to write i.e. the file **test.cvt** to the disk image **geos.dsk** you can use this command:
<code>
java -jar ac.jar -geos geos.dsk < test.cvt
</code>

====== Internals ======
GEOS requires a 6502 compatible CPU (e.g. 6510 or 8510).
For binary compatibility you will need RAM at $c100-$c2ff.

===== GEOS 64/128, GEOS Plus/4 =====
  * APP_RAM $04xx-$5xxx
  * PRINTBASE $60xx
  * OS_VARS $8xxx
  * DISK_BASE $9xxx
  * SCREEN_BASE $axxx-$bxxx
  * OS_JUMPTAB $c1xx-$c2xx
  * disk block size $100
Info by Maciej Witkowiak

===== Apple GEOS =====
  * APP_RAM $4xxx-
  * PRINTBASE $79xx
  * OS_JUMPTAB $fexx-$ffxx, $03xx
  * disk block size $200
Info by Stefan Haubenthal