ThinkPad 720 / c
dg720120.exe   Diagnostic Disk (v1.2): ThinkPad 700,700C,720,720C 
pctpx130.exe   PCMCIA Disk (v1.3): Thinkpads 720/C
pctpx130.txt     README: PCMCIA Disk (v1.3): Thinkpads 720/C
700c120.exe    Video Drv 256 Color (v1.20) For Win3.1: ThinkPad 700C,720C 
700propm.exe  Video Display Control OS/2: ThinkPad 700C,720C
r720c120.exe   Reference Disk (v1.20): ThinkPad 720C 
r720m120.exe   Reference Disk (v1.20): ThinkPad 720 

720 Planar, Front
720 Planar, Rear
Video Card
Keyboard Control Card
Voltage Convertor
9552 IDE Controller Kit

9552-307 -- 53G8210 (120M DOS)
9552-308 -- 53G8214 (160M DOS)
9552-30J -- 53G9408 (160C DOS)

The ThinkPad 720 and 720C systems come with 4MB of 80nS memory, expandable to a maximum of 16MB through the use of  IC DRAM cards of 2MB, 4MB or 8MB.
   The 4MB of memory is on the reverse side of the memory card socket. If you remove the bottom of the case, flip up the memory card socket and you will see the row of eight flat chips, similar to those on the 9533.

   The cpu is an IBM 486SLC2 50/25MHz (16KB cache), and a math coprocessor socket for a 25MHz 80387SL is on the bottom of the system  An optional 240MB HDD is also available to contain large operating systems and application requiring a large storage space.

   TRACKPOINT II:  The  720 and 720C has a TrackPoint II  built into the keyboard.  It works like the mouse and allows the user to point and select icons on the screen under control of the application.  It consists of a device that stands between the "G" and "H" keys, accompanied by two "Click-Buttons", which are positioned below the space-bar.  The device reacts to pressure from the finger-tip and the left button is used for selecting or dragging items on the screen. The right button simulates the Enter key in some applications.

ThinkPad 720 Planar Front
J6 Serial Connector
J7 Parallel Connector
J8 System-Expansion Connector (240-pin)
J10 PS/2 port (Mouse/KB)
J11 PCMCIA card interface
J12 Base Memory Card Interface
J13 Video Card Interface
J14 Backup Battery Connector
J16 Hard Disk Drive Connector
J15 Processor Card Interface
JMP1 ??
S1 Password-override switch
U14 BIOS 59G3639
U15 48G8905
U21 NS PC8477BVF-1 Floppy controller
Y4 14.138 MHz osc

There are upgrade BIOS chips available. More as I find out.

JMP1  This resembles the small, short jumper headers on the bottom of hard drives. What does it do? I haven't a clue...

Remove 720 / C Power-on password
   1. Power-off the computer. 
   2. Remove the battery pack and the bottom cover. 
   3. Locate the password-override switch on the system board. (See 'System Board (720, 720C)) 
   4. Slide the password-override switch to the left  position. 
   5. Power-on the computer and wait until the POST ends. 

Slide the password-override switch to the other position when service is complete. 

ThinkPad 720 Planar Rear
J1 System Status Indicator Connector
J2 Keyboard Control Card Interface
J3 Voltage Converter Interface
J4 Speaker Connector
J5 Diskette Drive Interface
U1 39G8788
U3 34G3547 Used on the PCMCIA /A
U4 95F3690
U7 59G3249
U12 Dallas DS1485S RTC
S1 Password-override switch
Y1 24.000 MHz Osc
Y2 10.000 MHz Osc
Y3 32.768 KHz Osc

700 Series Video Card

     1 External Display Connector
     2 LCD Connector
     3 System Board Connector
     4 Communication Adapter Connector

o   The ThinkPad  720  monochrome  model  does  not  support  the attachment of PS/2 monochrome displays.

Keyboard Control Card
1  Pointing Stick Connector 
2  System Board Interface 
3  Keyboard Connector 
4  Keyboard Connector 

Voltage Convertor
1 Power Jack
2 Battery Pack Interface
3 System Board Interface
4 Standby Battery Connector 
5 Suspend/Resume Switch

Test 720 Voltage Convertor

9552 IDE Controller Kit

Compatible with TP 700/C, 720/C, replaces existing cable. 
Supports 32-bit access in W95 (all others use 'compatibility mode'). 
Uses any 8-12mm IDE drive >/=540MB; BIOS rounds down to 2GB,1GB or 540MB. 
Requires new BIOS chip, refdisk ver 1.20. 
About 2x as fast as original ESDI drives.

   These interfaces were designed by the Swedish company Onsite in about 1995.  There seems to be some interest in these, and there are about 500 unpopulated flex PCB's left, so they may put back into production (the remaining 500 only) at some point. These were used in replacement plug-in drives sold to corporate customers (@$1200+ in 1995!).
   These kits can be used in the 700, 700c, 720, or 720c. However, this requires a upgrade BIOS 

   The strange 'round-down' scenario is a function of the controller chip passing specific hard-coded geometry parameters to the bios. It was easier to modify the bios than re-do the chip as drive sizes increased. They all use the same cyl/sector count, but the head no. is 16, 32 or 64 for the 540MB, 1GB and 2GB sizes respectively. IBM never made any MicroChannel drives (Ed. ESDI?)  bigger than 160MB, and their 240 and 340 drives used a similar interface translation chip.

9595 Main Page