Dan's IBM ThinkPad 730 pages
Madmax's 730T Page (actually, Pen Computing)
IBM 730T ThinkPad O/S & technical information page (Saved from oblivion?)

730TE Top View
Memory
730 Models
Remove Password
Batteries
AC Adapter
Compatible Stylus
External Floppy
Port Replicator
FRU Error Codes
Numeric Error Codes
Using a Mouse
Digitizer System Resources
External CRT

   1. Speaker Volume Buttons 
   2. Contrast Button 
   3. Backlight Button 
   4. Reverse Video Button 
   5. Suspend Button 
   6. PCMCIA Indicator 
   7. Battery Pack 1 Status Indicator 
   8. Battery Pack 2 Status Indicator 
   9. Power-ON Indicator 
 

  The reverse video switches between dark background/light text to light background/dark text. I prefer dark text/light background because less pixels need to be activated (help the batteries)

  Backlight has three settings dim, bright, and OFF
 

IC DRAM Cards
  I have used an 8MB IC DRAM card from a 720 with no problem.

Might be able to use 32MB IC DRAM cards. (TP370 32MB card fails- wrong memory speed)

1. Power off the system.
2. Remove the Pen Compartment Cover and the Sub Battery cover. 
3. Identify the security pin which is located beside the sub battery. 
4. Power on system while shorting the two security pins with a regular screwdriver's flat tip. 
  To enable the password again, select password on the Easy-Setup screen and enter the password. 

RLS104 replies:
   The Win CE pens will not work on your 730.  In general, any wacom pen will work - it's used on the Mitsubishi Amity's, the old Toshiba T100 and T200, and all pen enabled Thinkpads.  The CE pens are really just sticks - no electronic properties, whereas the wacom pens have some electronics in them that enables, for instance, the right mouse button from the button on the barrel.

   I used to have a 730TE, and have had a TP 360PE and it worked on both of them.  Both of them have the same video driver and digitizer as your 750P, so there should be no problem.

External Diskette Drive Checkout (2524)
   A scratch, write enabled 1.44MB diskette is required. 
  1. Select FDD icon on TEST MENU.  This runs the controller test and drive read/write test. If the test detects an error, FRU code 10 appears. In this case, replace the system board. 
  2. If controller test runs without errors, follow instructions on the screen and insert floppy.
  3. If the drive test detects an error, FRU code 50 appears. If the diskette media is known to be good, replace the drive or the drive cable. 

Port Replicator 84G0525

7.   AC Adapter Connector 
8.   Keyboard Connector (See Mouse Use)
9.   FDD Connector 
10. CRT Display Connector (640x480 resolution) 
11. Parallel Connector (Bidirectional parallel port) 
12. Serial Connector 

Numeric Error Codes 
Symptom/Error              FRU/Action
   10X                            1. System board
   100                             1. IC DRAM Card
                                      2. Memory Card
                                      3. System Board
       (Check 'Memory Checkout' before changing any device.)
   111                            1. Option Bus
                                     2. System Board
   161                            1. System Board
    (Backup Battery)
   162                            1. Check Device Configuration
                                     2. System Board
                                     3. Diskette Drive Assembly
                                     4. Diskette Drive Cable
                                     5. Hard Disk Card
                                     6. Modem Card
 (Check  'Installed Devices Check' before changing any device.)
   163                             1. Set Time and Date
                                      2. System Board
   164                             1. Check Device Configuration
                                   2. IC DRAM Card
                                     3. Memory Card
                                   4. System Board
       (Check 'Memory Checkout' before changing anydevice.)
   1XX                             1. System Board
   20X                             1. IC DRAM Card
                                       2. Memory Card
                                       3. System Board
   21X                             1. IC DRAM Card
                                       2. Memory Card
                                       3. System Board
   2XX                            1. IC DRAM Card
                                   2. Memory Card
                                   3. System Board
     (Check 'Memory Checkout'  before changing any device.)
   301, 31X       1. System Board
                         2. Keyboard
                         3. Port Replicator
   304, 305        1. System Board
                         2. Mouse
                         3. Keyboard
                         4. Port Replicator
   308                1. System Board
   3XX              1. Keyboard
                         2. Mouse
                         3. System Board
                         4. Port Replicator
   601, 6XX        1. System Board
                            2. Diskette Drive Assembly
                           3. Diskette Drive Cable
                           4. Port Replicator
      (Go to the 'External Diskette Drive Checkout' before changing any device.)
   602                    1. Diskette Drive Assembly
   9XX                   1. System Board
                              2. Parallel Device
                              3. Port Replicator
   11XX                  1. System Board
                               2. Serial Device
                               3. Port Replicator
   12XX                  1. System Board
                               2. Serial Device
                               3. Communication Cable
                               4. Port Replicator
   17XX                  1. Disk Drive Assembly
                               2. System Board
   24XX                  1. System Board
                               2. LCD Assembly
   5001 - 5016        1. System Board
                               2. LCD Assembly
   5017 - 5020        1. System Board
                               2. LCD Assembly
   8601, 8603          1. System Board
                               2. Mouse
                              3. Port Replicator
   86XX                  1. Mouse
                               2. System Board
                               3. Port Replicator
   101XX                 1. Modem Card
                                2. System Board
   102XX                  1. System Board
   I9990305              1. Operating System
                                2. OS Device

Alfred Arnold reports:
   Might be that it's not officially supported, but that doesn't mean that it doesn't work.  My TP730TE came without the pen, so I had to look for an alternative.  Got a Y-shaped adapter from a friend that has a PS/2 plug on one end, and two PS/2 sockets at the other end.  The sockets are labeled 'Mouse' and 'Keyboard'.  Stick the plug into the replicator's keyboard
jack, you plug in the mouse and the keyboard into the two sockets, just like the two PS/2 sockets of an ordinary machine.  Works like a charm - at least under Debian Linux...the adapter is entirely passive, so the signals for mouse /and/ keyboard must be present on the 730's keyboard jack.

From me, god-Emperor of Microchannel
   Picked up a PS/2 splitter from Ebay. I used a Model M keyboard. First attempt failed with the Model M on the keyboard cable of the splitter - the LEDs didn't light up during POST. Swapped the keyboard to the mouse cable of the splitter, tried again. It works. Now to load something with mouse support...

An IBM Announcement says:
"Space saver keyboard (84G2524) usage
    To attach a space saver keyboard through the port replicator, a Y-cable is required.  The Y-cable connection must be reversed so that the keyboard is connected to the mouse connector of the Y-cable and the mouse is connected to the keyboard connector of the Y-cable."

External CRT
   When the external CRT monitor is attached to the system, the CRT monitor supported is VGA (640 x 480, 16 colors). The LCD and external VGA CRT are simultaneously displayed.