8533r12m.exe 12MHz (no external video)
8533r16m.exe 16MHz (external video)
NT Users! You may get a complaint
of an OS/2 call and the extraction will fail. In that case, use forcedos
8533r1xm and it will work.
8533SX Repair Center Maintenance
NOTE: Most stuff claiming
personal experience with the N33 is from Peter Wendt. I only did the PS2.EXE
N33 16MHz Planar, Top
N33 16MHz Planar, Bottom
N33 Hard Drive
Drive Manager for >512MB
Pinout and Wild Hypothesizing on the Floppy
CN10 CMOS buffer battery
CN16 FDD connector
IC24 Ricoh R2146705
IC26 Ricoh R2146704
IC34 Ricoh R2146702
|IC36 Ricoh R2146703
IC49 NEC D4714
XTL1 20.000 MHz osc
XTL3 32.000 MHz osc
XTL4 24.000 MHz osc
XTL5 32.768 KHz
XTL6 14.718 MHz osc
XTL7 48.000 MHz osc
Some infos on the connectors:
CN3 / CN3 connect the backplate to the sysboard.
The backplate holds
- serial port
- parallel port
- video port
- "pointing device connector"
- on/off switch
- speed auto / max
- resume on / off
- video normal / inverse
- volume slide
- all LEDs
CN14 (located over the memory connector towards the board edge) + CN15
are the IDE HD connectors for a strange split cable Your CN14,
seems to be CN13 in fact and is the standby backup battery connector (used
during battery changes)
16MHz Planar, Bottom
CN6 internal modem connector board
CN7 LCD video port
CN8 main battery port
CN9 speaker port
CN11,12 internal keyboard connectors
CN13 resume / suspend LCD cover
IC56 outline for 387SX-16
OTB1 erase startup password / clear
SW1 (pushbutton). No idea what
purpose. Shows no reaction when you push it.
Almost correct, but Peter is complaining about his own scan when he
say I got some of it wrong...
The (?) ROM is a PLCC OTP-version of the 27C1001 (1284K
x 8). Not eraseable - One Time Programmable (a PROM so to say). .
>Please note the dotted outline on the bottom side of the planar for
IC56, a surface mount 387SX-16. I wonder... Peter, would the possibility
exist for S.H.I.T. to happen with the installation of a surface mount 387SX?
Err ... very theoretically yes. How are your skills in SMD soldering
The 387 sits very close to the 386SX and you only need
to "pull wires" to an empty spot on the sysboard. Obviously they designed
the system *with* the 387 - but that thing was darned expensive back in
'92 or so - so they left it away. You won't run AutoCAD on a 386SX-class
The PLCC socket has the same pinout. So you could use
a socket and a PLCC chip too. But *that* may fail due to the lack of room
to the modem port. But what - cut that crap away. No one uses the proprietary
2.400 bd modem in a N33.
BTW: The N33 case has *lots* of room otherwise. Seems
as if it was planned to either put a much bigger HD in that case *or* (more
likely) have the FDD internally. The one internal framepart has holes that
perfectly match the FDD used in the TP700/720/ PS2e. By what reason they
decided to buffer the FDD signals on a separate board and attach it
externally via a strange Mini-Centronics 30-pin (I think, must count).
Today's verse is from the book of Peter of Lemgo (surnamed Wendt)
The 8533 N33 was originally a machine developed by IBM
Japan for domestic markets. After the arch-rival Compaq brought the E-Lite
386 laptop series IBM was forced to bring out a counter-product.
IBM Japan at that time had about a dozen different laptops and notebooks
The N23 didn't make it to here, the N51 (8551) has been
adopted as well as the CL57SX Color Laptop (8554 - hence CL54 in Japan)
... The CL57 identifies itself as PS/55 in the BIOS - PS/55 machines
*are* domestic japanese machines intended for local markets. 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
The N33-X13 was a "quick shot" derived from the
N23 - they changed the keyboard to US/Euro style (along with the sysboard
by what reason) and they cut down the 386SX to 12MHz for a low-entry model,
which never really took off. The better -X15 version introduced a little
later had 16MHz SX and external video port.
The N45SL (2614) -by the way- is a Zenith OEM based
on ISA/AT technology, which IBM bought to extend the line of machines.
The PS/note 182 (2141) was also an OEM machine from Japan as far as I know.
Has been taken to introduce a laptop in the PS/1 family.
G13 unit it has no external video port and 386SX-12, a -G15 has external
video port and 386SX-16. Max. memory 6MB, B/W LCD 10.4", 640 x 480 / 16
greyscales. HD either 40 or 80MB.
I have a -G15. They have some "classical defects": either don't work
at all, or work only on battery or AC power but not on both. Batteries
die very soon, short runtime on batteries anyway. HD can be replaced against
standard 2.5" Laptop IDE drive of either size up to 8GB - given you have
a good disk-manager software. (Mine has an 850MB currently installed).
The N33 takes 6MB total. 2 onboard - one 4MB module with
"minor rework" if it isn't the exact part for the N33. I use 4MB/70ns Parity
and rework the connector and the presence detection. Easy doing. 5 minutes
or so. - the memory module is a particular module ... says IBM. But if
you use a sharp cutter or plier you can cut out the "nose" in the memory
module connector to make standard 72-pin Simms fit in there. This is one
half of the action - the other one is the proper presence detection. The
dirty details on that are HERE.
In brief: if you modify a 4MB / 80ns or 70ns 36-bit Parity
module you need to remove the coding "bridges" for the pins 67 and 68 and
solder the bridges for pins 69 and 70 ... that's all. On Martins machine
I used a spare 4MB / 80ns Parity which has bridges for all four pins 67
- 70 and removed the two for 67 and 68. Works fine - the N33 requires only
80ns memory, but the 70ns modules are often easier to get.
N33 Hard Drive
About the drive current: AFAIK the 80MB WDA-280 is rated
+5V / 0.7A, the 60MB Conner CP2067 IBM used occasionally is rated +5V /
680mA. I used a Toshiba HDD2517 814MB drive rated +5V / 0.7A and its smaller
brother with 340MB for quite some time in my N33 with no problems. I would
guess that even 1A doesn't do much on the DC/DC circuit .... but on the
over all runtime on batteries (if they work at all).
Helmut has a 2.1GB Toshiba in his N33, and Martin ("Spooky")
also uses a bigger drive (540 ? forgot what I installed years ago when
he came over the first time). Also with no problems. So I think the most
modern HDs will do fine in there.
Problem is to find an appropriate Disk Manager - most
newer versions are "manufacturer-dependent" and you cannot install a Toshiba
with a WD or Maxtor version.
I really love my N33. I use it as intelligent terminal
(for routers, switches
and hubs) and outdoor wordprocessing. Maybe I build a large solar panel
for it recently. :-)
Drive Manager for
> Problem is to find an appropriate Disk Manager - most newer versions
are "manufacturer-dependent" and you cannot install a Toshiba with a WD
or Maxtor version.
Product Features Supports installation of any manufacturers hard disk
drive, including Fujitsu, IBM, Maxtor, Quantum, Samsung, Seagate, Toshiba,
and WD. Breaks the following barriers: 528MB, 2.1, 4.2, 8.4, and
I have an 8533-G15 myself. Bought it at german ebay -
and guess what: one of the fuses was blown so that the machine ran on batteries
only. But not for long of course and the batteries needed to be charged
externally outside the machine. And the batteries were both on their last
I replaced the blown fuse, replaced the tiny 80MB
HD with -currently- a 340MB type I had around (it *did* run with a 1.2GB
as well - but I needed that drive for a different project) and I crapped
out one of the dead batteries and replaced the cells. They are "3/4" types
and all six cells cost about 30 Euro. Now the machine nicely runs for about
an hour on battery.
Set Feature program . PS2.EXE can be used as a menu driven program
or a line command. You can even invoke this function from a batch file.
This selection copies the following sample batch programs and a utility
program which can be used in your operating environments
(DOS, OS/2, or DOS OS/2 DUAL).
* DEFAULT.BAT, DEFAULT.CMD: These programs set all the operational features
to the default values. The default assumes external power (AC or Car Battery)
* TRAVEL.BAT, TRAVEL.CMD: These programs set all the operational features
related to the power supply by the Rechargeable Battery to the values that
make the battery life as lengthy as possible.
* PRINTCOM.BAT, PRINTCOM.CMD: These programs turn off and on the parallel,
serial, and communication interface connectors at the same time.
* EXT_PWR.EXE: This program detects what power source the computer is
using, and returns two kinds of codes depending on the power sources. You
can use the return codes as the conditions as to manage the power usage.
* SETUPPWR.BAT, SETUPPWR.CMD: This is a sample program which uses EXT_PWR.EXE.
It runs the TRAVEL batch program if the power is supplied by the Rechargeable
Battery or if the power is supplied by AC or Car Battery adapter, it runs
DEFAULT batch program.
* DISCHRGE.BAT: This program is used to discharge the Rechargeable Battery.
N33 FDD Iinnards
Had the time today to check out the N33SX FDD ... here's the result.
Drive plug - 34pin Berg
33 | o o o o o o o o o o o o o o o o o | 1
34 | o o o o o o o o o o o o o o o o o | 2
(View from the front)
System plug - 26pin Mini Centronics
25 \ # # # # # # # # # # # # #
26 \ # # # # # # # # # # # # #
(View from the front)
System to FD Pinout
| FDD | System
| FDD | System |
| 1 |
N.C. | 2 |
| 3 |
1 | 4
| 4 |
| 5 |
N.C. | 6 |
| 7 |
5 | 8
| 6 |
| 9 |
7 | 10 |
| 11 | N.C.
| 12 | 10
| 13 | N.C.
| 14 | 9
| 15 | N.C.
| 16 | 12
| 17 | 14
| 18 | 11
| 19 | N.C.
| 20 | 13
| 21 | N.C.
| 22 | 16
| 23 | N.C.
| 24 | 15
| 25 | 17
| 26 | 18
| 27 | 19
| 28 | 20
| 29 | 21
| 30 | 22
| 31 | 23
| 32 | 24
| 33 | 25
| 34 | 26
FDD is a Panasonics JU-237 A03W (P/N 72X6074), +5V only 0.8A.
However I'd tested the N33 with 2 different +5V-only drives:
Mitsubishi MF356F-815MB (a white 2.88MB), FRU 82G1888
Mitsubishi MF356F-899MF (a " * " 2.88MB), FRU 64F4148
Both worked with R/W/ format 1.44MB media. Hope this helps a bit.
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