Thanks to William Walsh for the memory and Trackpoint additions.
Open the 8543 (Not done!)
TMC-850 SCSI adapter
ISA 16/4 TAP adapter
RFL40103.EXE PS/2 L40 Reference Disk v1.03
191-030 IBM PS/2 MODEL L40 SX SYSTEM AND FEATURES
191-204 IBM PS/2 Communication Cartridge I (3541)
L40 Quick Reference Guide (960K)
L40 Hints and Tips (44K)
L40 HMM Extract (148K)
SHS15F-2266-01 IBM PS/2 Model L40 SX HMS (*.boo format reader HERE)
SHS15F-2267-00 IBM PS/2 Model L40 SX HMR (*.boo format reader HERE)
Getting to 16MB RAM (or upgrading RAM at all)
Using 2MB EMS with Windows 3.x on the L40
Clear A Power On Password
Minimum OS/2 Version Required
BSD / Linux
W95 on the L40SX
Volksfürsorge Suitcase "Solution"
Comments- There are at least five Linear Tech chips
the upper right that I didn't show. There are solder spots for a 60 pin
header under the right side of the heatsink. The double box around the
386SX-20 is where there is a double row of solder pads that are all
to the SMD leads of the 386SX. Possible upgrade that never showed up?
External keyboards are not supported. 80387SX Math Coprocessor PLCC
Using 2MB EMS with Windows 3.x on the L40 (by William Walsh)
When two 8MB memory modules are installed in the system unit, the planar's onboard 2MB of memory is allocated by automatic configuration as 2MB of EMS memory since the 386SX CPU can only address a maximum of 16MB extended RAM. This memory can then be used with a special driver IBM provides on the L40SX starter diskette. This driver is installable by means of the UINSTALL utility provided on the starter disk.
The driver is easily installed by UINSTALL but IBM warns you not to install the driver if you are a Windows 3.0 user. I decided to install the driver on my maxed-out L40 anyway since it didn't cause trouble with Windows 3.10. However, after transferring the 8MB part from one L40 to my other one, Windows for Workgroups 3.11 refused to start, complaining that an incompatible EMS driver was being loaded.
David L. Beem looked in his Windows 3.1 resource kit and found the answer to my problem. A simple addition of
to the Windows SYSTEM.INI file under the [386Enh] section solved the problem and made the system work great with IBM's EMS driver.
Update: An attempt to create a RAM disk using the EMS
booting Windows 3.11 resulted in total loss of the data on the RAM disk
even though Windows did see it.
Modifying standard SIMMs to L40 is HERE
(by William Walsh)
4MB SIMMs have been successfully converted for use in the L40SX by more than one person. However, it is supposed that you can only use one 4MB SIMM in the system--two are simply not allowed. (Anyone want to prove or disprove this?)
No modifications to 8MB modules have worked as of this writing (04/2002). However, a somewhat satisfactory solution using modified 16MB modules at half capacity has been found. I have been lucky enough to find two L40 with genuine 8MB modules in them, so I have not attempted any modifications.
The one module I had modified for me (a 4MB module) by David
rejected by both my L40SX. It was usable and passed diagnostics, but
a constant "164" from the system at POST.
FRU 79F0983 PN 72X6074 Panasonic JU-237AO3W
Floppy is in a carrier and it has a metalized
around all sides but the front. Small cutout for the drive connectors
the back. The cable is the much beloved tape style. 17mm high "super
3.5-inch floppy disk drive
60MB HD 79F1009 Connor CP2067 5v 640 mA
Due to its vintage, the L40 undoubtedly has the 504M limit disease on native BIOS support. You can use a Disk Manager software package to overcome this limit.
Unless you buy a standalone disk manager program, free ones provided by drive makers will generally only work with that manufacturer's drives...
Peter Wendt sez:
If you want an alternative product: Look in the "support /
pages at www.maxtor.com and download the stand-alone (bootable) version
of MaxBlast ...
From left to right
Economy switch, carrier detect, speaker, batter status, dew point, HD in use, Floppy in use, Num Lock, Cap Lock, Scroll Lock, Suspend Mode, Power Switch.
Peter Wendt sez:
The L40SX (8543) was a japanese/US co-product, where the technology came from Japan - and the design, marketing and supervision was located in Boca Raton. That was unneccessary complicated and lead to a near 1-year-delay of the project L40.
Trackpoint (Model L40 SX) 1397090 (by William Walsh)
Option Diskette and Trackpoint courtesy of Tim Knight. Disk image coming soon.
Switching from Trackball to Mouse operation (or the other way around)
Function Of Trackball Mode Buttons
The two small buttons facing the front of the Trackpoint enable drag lock for either the left or right buttons. The two large buttons function as normal "click buttons".
Turn off the computer and all attached options. Connect the
device directly to the pointing device connector on the computer or on
the pointing device passthrough located on the numeric keypad.
Q.. Is there any way to
LAN or terminal emulation adapter to the L40SX?
Q. The announcement letter
that only LAN adapters, 3270 and 5250 emulation adapters are supported
in the Communications Cartridge I. Can other adapters be used as well?
Q. I can't seem to print
Q. I can't get my
software to recognize my serial port (or internal fax/modem).
Q. I can't get my serial
Fax/Modem PN 95F4817 FRU 79F0996
J1 50 pin header
Interesting, uses the 80C32-1 cpu...
It has two RJ11 phone jacks for concurrent network and telephone handset connections. It supports data (up to 2400bps) and fax (9600bps) communications, and standard Hayes AT (R) commands.
Q. What is the syntax of
command to use with the L40 Fax/Modem?
Q.. What fax software can
with the L40 Fax/Modem option?
Q. If I have the Fax/Modem
in a L40, with the speed turned down to 5 or 10MHz, will this affect
performance or accuracy of the Fax input/output?
Easy to read, 10-inch Supertwisted Nematic (STN) LCD with 640 X 480 Video Graphic Array (VGA) resolution, and cold fluorescent sidelighting with a 12 to 1 contrast ratio. 10mm thick, black on white monochrome. Depending on the application, up to 32 grey scales can be addressed on the LCD. It displays black characters on a white background with 80 characters per line and 25 lines per screen.
Q. I can't get an external
to work off the PS/2 Model L40 VGA port; the monitor is blank. What's
Q. When I attach an
or projection device to the PS/2 Model L40 VGA port, the LCD goes
Is there any way to have both displays working simultaneously (for
demonstrations to large audiences)?
Clear Power on Password
1. Power-off the computer and unplug the power cord.
2. Remove the system-unit cover.
3. Move the password jumper J23 (Ed. W2 on my planar) to connect the center pin and the pin on the opposite end of the connector.
4. Power-on the computer to erase the password. There is no need to move the jumper back to the previous position.
Q. What's the minimum OS/2 version required for the L40?
Alfred Arnold takes a guess with:
William Walsh went for it:
A while back I installed Win95 on my L40SX. The experience went pretty well and speed wasn't all that bad...maybe not on the order of using it this way for serious work, but fast enough for tinkering.
Anyway...Windows 95 didn't detect the onboard VGA as plain VGA. The chipset used is a Western Digital something and that's what Win95 found. I have not been able to locate a data sheet for the IC used, but I wonder if it is capable of more than plain VGA with a memory upgrade/hack?
I suppose the likelihood of the internal panel supporting more
16 grays is not good, but an external CRT could always be used for the
higher up modes.
Volksfürsorge Suitcase Solution
Peter Wendt reminisces:
The German Insurance company Volksfürsorge had a suitcase-solution based on the L40SX. I used to service these machines in the early 90s. They had quite a lot of them delivered to their crew of sales droids ... and then IBM found out that the L40SX had a serious insulation problem with the internal DC-DC converter ... I must have patched up several 100 if them.
The "docking station" consists out of the power supply (charger for the external battery pack / supply for laptop and printer) plus some wires for DC-Supply (laptop and printer) and a flat-ribbon cable for the printer data. The Kodak / Diconix printer was awfully mediocre. Another version of that suitcase used the Canon BJ10 / BJ20 or its IBM-cousin (have one in the collection - not using it however).
They later switched to the TP700 / TP720 ... plus an Olivetti inkjet of outstanding lousy quality.
Wonder how they made it clear to them that it looks good to walk around with a Samsonite-like piece of luggage. The Olivetti jammed regularly, made grinding noises during print (if it did) and the output was close to unreadable in 8 from 10 cases (missing lines, ink spots etc.pp.) plus the "standard extra" of trying to fanfold the paper otherwise when it goes through. It was a real shame. Really.
The prints looked poor even when the printer was brand new. Older units - after 3 or 4 month of irregular use and poor to no maintenance - created even far more worse results. The complaints never ended. Not about the IBM Thinkpad (apart from being a tad slow and about some display deficites) but the charger electronics inside and the printer were pretty bad.
If the charger itself didn't blew up it "helped" to fry the batteries - that extra pack as well as those on the printer. The laptop had its own charger circuit ... if the charger blew however it used to took laptop and printer with it due to a large spike of overvoltage. No one *I* asked really liked these "integrated solutions". (But that could as well be a false impression, since I used to meet the people when they had their systems repaired ... some had good stories to tell ... )
A life-care competitor used the Canon BN120 laptop with integrated printer for their sales / customer-service staff. I had one and sold it last year (I think - or the year before). It was a 486DX2-25/50 / 8MB / 540MB HD / 9.5" Mono-LCD machine and the printer was largely based on the BJ10 with a 10-sheet single feeder - and it worked surprisingly good. The machine was a bit too thick for my taste and therefore a bit unusual to work with *on a desk*. But it worked at least *and* made respectable printouts.