System Requirements
The following sections provide system requirements that must be met before installing Oracle9i Developer Release 1 (9.2.0.3.0).
Hardware Requirements
The following are minimum hardware requirements:
* 512 MB memory
* 3 GB of available disk space
Operating System Requirements
The following list indicates operating system requirements:
United Linux 1.0 (x86-64) operating system with kernel version 2.4.19 or later.
glibc version 2.2.5 or later
GNU gcc version 3.2.2 or later
async libraries libaio version 0.3.15 or later
JDK version 1.3.1_02
or Windows XP Professional 2000.
This is what given in the pages of Oracle home site.
But don't worry, you have not a bad configuration.
256RAM has no problem with installation.
Only thing is that it may take a lot of time in processing your result as well as it make your system booting time delayed to a great time.
But still of these problems u r able of use your developer package of Oracle 9i.