DGN51120.EXE N51 (SX & SLC) Diagnostic Disk v1.20
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 System And Features (8551-033) 80386SX-16, 40MB HD
192-072 Model N51 SLC System 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 Planar, Top
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 Suppressed Memories
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-
Exuntcfg.exe Expansion Unit Configuration Utility
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
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.
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
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
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
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.
This settings worked for me with the Mono server. I can not guarantee
AdapterId F1FE Built In Features
Serial Port A
Serial Port B
Parallel Port Arbitration Level