The modifications listed on this site are for your own personal use.  I can not and will not take  responsibility if you damage hardware, software, yourself or others, or personal property while attempting these modifications.
                 If that hasn't scared you away.....these modifications are fantastic!  The following mods are  just a few of the documented modifications I have tried and successfully gotten to work.  I am working  with others on testing, documenting and making available modifications, even at them time of this  writing.  So stay tuned and check here often for any changes.  Otherwise, I might suggest a visit to the forum or chat (better during the evenings) and see if you can give some of your ideas!
 

  -  Adding a 1.44mb (acting as 720k) to the PCjr

  -  The "Home Computer Magazine" Floppy Modification  C/O Emerald Valley Publishing

  -  Modifying an IBM PCjr Parallel Port Sidecar to function Bi-directional  C/O Mike Brutman

  -  Modifying an IBM PCjr Parallel Port Sidecar to take LPT2: (Hex 278)

  -  Installing a Mass Storage Device

  -  The "Tandy" color modification

  -  Patching DOS 5.0 to run on the PCjr

  -  Boost the jr up to 736kb RAM
 

---------------------------------------------------Networking with the PCjr---------------------------------------------

   *  Currently, there are members from the forum working on personal software to get the PCjr working online.  There are an infinite number of TCP stacks and  DOS programs  to get you playing with the PCjr online, but there is not a whole lot of hardware out there to accomplish this.  The neatest thing we use is the XIRCOM PE3-10BT parallel port ethernet adapter.  The adapter's software runs flawless on the PCjr and I am very satisfied with it. 

Here are some file options you can utilize in order to get your jr on networks and "online"  

  -  intscr.dat - Data file used to fix addressing issues with the jr, to allow the loading of
                      Trumpet TCP/IP - Author Mike Brutman

  -  pe3pd.com - Xircom PE3-10BT packet driver

  -  ntcpdrv.exe - Trumpet TCP/IP driver - Author Peter Tattam

  -  ircabi.exe  - Trumpet based DOS irc.  - Author Peter Tattam

  -  tel2.exe  - Trumpet based DOS TELNET.  - Author Peter Tattam
 
 

* To get the PCjr online, started with a minimum of  a 2-drive system (1 x 3.5.5 and 1 x 5.25), and 736kb (with use of jrconfig).  Next I ran the above 4 files in the following order:

1) PE3PD.COM - Initialize the PE3 adapter

2) DEBUG < INTSCR.DAT - Allows the Trumpet driver to be loaded

3) NTCPDRV -ip=192.168.x.x -netmask=255.255.255.0 -gateway=192.168.x.x -dns=192.168.x.x                              

4) IRCABI - irc for DOS

Its really easy once all the kinks are worked out.  If you wish to try this and have somebody on to test it with, feel free to give a call out in the forum.