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rfn51120.exe N51 (SX & SLC) Reference Disk v1.20 (zipped image)
dgn51120.exe N51 (SX & SLC) Diagnostic Disk v1.20 (zipped image)
n51vdfix.exe Display Utility N51SX (Thank Heinz Rath for this!)
@EFD9.ADF IBM Font ROM
tpvol1.pdf L40SX, CL57, N45, N51 HMM
192-065 Model N51 SX And
Features (8551-033) 80386SX-16, 40MB HD
192-072 Model N51 SLC And
Features (8551-025) 386SLC-16 w/8KB L1, 80MB HD
192-258 IBM 3550 Expansion
Unit Model 001
192-261 IBM High Speed Internal Data/Fax Modem
193-087 IBM High Speed Internal Data/Fax Modem
SHS04G5111 IBM PS/2 Model N51 SX HMR
SHS04G5112 IBM PS/2 Model N51 SX HMS
8551 Error Codes
8551 Power
PS/55note N51SLC
8 MB PD for PS/2 Note N51sx (by Jim Shorney)
8551 Planar, Top
8551 Planar, Bottom
System Firmware
ROM Images
8551 Supressed Memories
Communication Cartridge II (Micro Channel)
Remove Power On Password (POP)
LCD / Video
Linux on N51
ADF Sections for planar (minus ESDI)
8551 Planar, Top
1. LCD Interface
Connector
2. System-Expansion
Port (120-pin)
3. Keyboard-Control
Card Connector
4. Battery Presence
Switch
5. LCD Interface
Connector
6. LCD Interface
Connector
8551 Planar, Bottom
1. I/O Panel
Connector
2. Voltage
Converter Connector
3. System
Expansion Port (120-pin)
4. Password-Override
Connector
5.
Memory-Module Kit Connector
6. Hard-Disk
Drive Connector
7. Voltage
Converter Connector
8. Hard-Disk
Drive Connector
9.
Diskette-Drive Connector
10. Diskette-Drive
Connector
11. I/O Panel
Connector
12. I/O Panel
Connector
System Firmware (POST & BIOS)
Firmware stored in EPROM.
ROM Images
N51 SX Planar
95F3744 - 07 Mar 1992, rev. 4, 27C010 (U19)
49G2752 - 18 Jun 1992, rev. 5, 27C010 (U19)
N51 SLC Planar
35G4645 - 15 Apr 1992, rev. 1, 27C010 (U23)
8551 Suppressed Memories
From Peter:
I think it was. It uses the same 2.5" DF9F
version that the CL57 / TP 700 & 720 use too - a
typical IBM part to be found nowhere else than in "True
Blue" units. The harddisk is a INTEGRATED ESDI adapter
(DF9F like a TP720)
Steven Gorenbergh (in a sotto voice) whispers-
I bought my N51 and docking station in 1994
when IBM was selling all 80386 (and lower) machines to
the employees.
I recall at least 1 review of the N51 by PC
Magazine by Bill MacCrone in the 1993 time frame. He
generally liked many things about the machine, but
thought that it was under powered. The N51 was
also displayed on the cover of the 1993 IBM PC Catalog
along with the P70 and CL57,
The N51 was one of the first IBM notebook
machines designed and made in Japan (along with the
CL57). These machines are the immediate parents to the
IBM ThinkPad 700 / 720 family. The IBM ThinkPad
700 has the same form factor as the N51 (both have
similar but different docking stations) and a still
impressive 10" VGA color display.
Exuntcfg.exe Expansion Unit Configuration Utility 3550
or Comm Ctg II?
Communications Cartridge II
P/N 54G0182 FRU 54G0183 (Micro Channel version!)
Originally for the CL57, or "PS/2 note", P/N was
07G3970
Hardware Maintenance Library Communication Cartridge
S10G-4421
Communications Cartridge II,
Open
If you are disassembling this, the system connector can
be removed after all screws are removed. There is one
big standard screw on the top of the case that holds the
black EMI shield to the plastic cover. The system
connector PCB (still within the EMI shield) needs to be
rocked a bit to help free the edgecard from the socket.
Communications Cartridge II,
PCBs
Remove
Power-on Password (POP)
 1.
Power-off 8551 and unplug power cord.
2. Remove bottom cover
and battery pack.
3. Locate override
connector on planar.
4. Install jumper over
pins as shown.
5. Power-on computer
to erase password.
6. Remove jumper after
POST completes.
(Or you won't be able to reset a POP)
Internal Communications Options
Internal Data/Fax Modem
P/N 94X2555 / FRU 53G7772 (2400b data/9600b
fax).
Serial Adapter
P/N 79F6800 / FRU 79F6840
The IBM PS/2 Internal Data/Fax Modem and IBM
PS/2 Serial Adapter optional features use the same
internal connector so only one of these options can be
installed per system.
High Speed Internal Data/Fax
Modem P/N 42G2580
Full function, auto-dialing,
auto-answering, data/fax modem. It is an
international modem with error correction, data
compression and power management capabilities. V.32bis
Data (300-14400bps)/V.17 FAX (300-14400bps The modem has
the ability to facilitate an acoustic coupler
The IBM High Speed Internal Data/Fax Modem
is compatible with the existing IBM Internal Data/Fax
modem (2400b data/9600b fax). It has the same
physical form-factor and support the same application
interfaces.
LIMITATIONS:
V.42bis data compression is limited by applications that
utilize the BIOS controlling the serial port. Data
compression for applications that do not bypass the BIOS
is limited to 19.2K bps.
Many applications bypass the BIOS.
Hence, they allow data compression approaching the
theoretical limit of 57.6K bps, or four times data
compression.
Modem Init Strings
IBM N51 Laptop 14400 AT&F&C1&D2J0N7Q3V2%C1
IBM N51 Laptop 9600 AT&F&C1&D2J0N7Q3V2%C1
IBM PS/2 Data/Fax Modem AT&F&C1&D2Q3N3J0V1
1 Serial (It seems that the chips for a second serial
are already on board because all programs detect two
ports!) So i think that the adapter for the second port
was only a simple adapter with the connector to the
outside.
1 Parallel port can be used in Standard and PS/2 mode (For
ZIP drives for example)
Liquid Crystal
Display
Easy to read, 9.5-inch Liquid Crystal Display
(LCD) with 640 x 480 Video Graphic Array (VGA) resolution,
and cold fluorescent backlighting. Depending on the
application, up to 32 grey scales can be addressed on the
LCD. The LCD displays black characters on a white
background with 80 characters per line and 25 lines per
screen. This black on white can be reversed to a
white on black mode by a simple switch "reverse" mode
operation.
When the VGA port is operational, the integrated LCD is
not operational. The VGA card has 256 KB Ram and seems
to be a WD90C00. Maximum Resolution 640x480
Memory Configurations
Each IBM PS/2 Model N51 SLC has 2MB of memory
soldered to the planar. There is one memory
expansion socket available. Memory options (2MB, 4MB
and 8MB) support memory configurations of 2 (standard), 4,
6 and 10MB.
2MB Memory Module P/N 07G1826
4MB Memory Module P/N 07G1827
8MB Memory Module P/N 07G1828
Communications Cartridge P/N 07G2580
External expansion port that can accommodate
a half-size adapter. It also contains an AC adapter
that converts power to DC and provides low power to the
cartridge. The communications cartridge attaches
directly to the PS/2 note without using a bus cable.
IBM PS/2 Miniature Mouse P/N 07G0033
IBM PS/2 Numeric Keypad P/N07G0032
Pointing device port for the external numeric
keypad, or the IBM PS/2 Miniature Mouse. The numeric
keypad also has a mouse port to enable both numeric keypad
and pointing device connections concurrently.
o External keyboards are not supported.
Linux
on the N51
From Heinz Rath
The following infos i have from running Linux
(Kernel 2.0.35) on this
machine. The boot parameter reboot=bios is needed so that
no crash happens. My 40MB harddisk isn't detected correct
so i set the following parameters eda=38,32,64. With this
settings the ESDI disk worked under this kernel.
With Kernel 2.2.17 the harddisk is still not correct
identified. I haven't tested if the boot parameter (eda)
is correct because i booted from a Zip disk and didn't
use the ESDI disk with this kernel.
X11 Settings
For X11 i used the following settings.
Section "Monitor"
Identifier "LCD"
VendorName "IBM"
ModelName "N51sx"
HorizSync 43.03
VertRefresh 81.99
ModeLine "640x480" 28.32 640 656
720 658 480 480 486 525
EndSection
Section "Device"
Identifier "VGA"
VendorName "IBM"
BoardName "N51sx"
Chipset
"generic"
VideoRam 256
Clocks
28.32
EndSection
This settings worked for me with the Mono server. I can
not guarantee that
the settings are correct because i have found them in
the following way. I took the XF86Config file of a TP
300 which i have found in Internet and then i changed it
until the server started and i got a screen on the
display.
AdapterId
F1FE Built In Features
Serial Port A
The serial port can be assigned as Serial
1, Serial 2, or disabled.
<"SERIAL_1,IRQ4"
(io
03f8-03ff 083f8-083ff int 4)>, 2,IRQ3
(02f8-02ff 082f8-082ff int 3), Disabled
Serial Port B
The serial port can be assigned as Serial
1, Serial 2, or disabled.
<SERIAL_2,IRQ3
(io
02f8-02ff 082f8-082ff int 3)>, Disabled,
1,IRQ4 (io 03f8-03ff 083f8-083ff int 4)
Parallel Port
The parallel port can be assigned as
Parallel 1 through 4 or disabled.
<choice
vcheck "PARALLEL 1" (io 03bc-03bf 1278-127b int
7)>, 2 (0378-037b int 7), 3 (0278-027b int
7), 4 (1378-137b int 7), Disabled
Parallel Port Arbitration
Level
The parallel port can be assigned an
arbitration levels of 0 through 7. Select
<Disabled> to use the parallel port in
compatibility mode.
<choice
vcheck "Level 6">, 5, 4, 3, 1, 0, Disabled, 7
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