193-350  53 486SLC2 (-0B7 / 0BB) 53LS 486SLC2 (-1BX / 2BX)
rf9553a.exe Reference disk for 9553 V1.10
rd9553a.exe Diagnostic Disk for 9553

9553 Planar
Remove Password
Serial and Parallel Ports
IDE Controller Trivia
Floppy Cable Hack
Windows 95 drivers
Graphic Modes Supported
Power Manageable Display
9553 Riser
Open the Case, Remove Front Bezel

9553 Planar 71G5951
F1 PTC for KB/Mouse
J2 Mouse
J3 Parallel
J4 DB25 serial
J5 HDD15 Video
J8 PSU connector 1
J9 Privilege access password 
J11 Password-override connector
J12 PSU connector 2
J13 Power connector, +5,+12,Gnd
J14 IDE controller
J15 Floppy
U3 22.1184 MHz osc
U7 LT1141CS
U9 14.31818 MHz osc
U11 CL-GD5426-80QC-A
U12 10G4672
U14-16 72 pin SIMMs 
U18 Dallas DS1387
U19,20 (21,22) KM416C256AJ-6
U29 80C2077SL
U47 MX 82G1767
U48 96F7690
U49 486SLC2
U61 50.0000 MHz osc
U63 PLCC Socket for 387SX
Y1 R24CA33 xtal
   They're souped-up 8555SX with the Reply-Corp. systemboard. IBM made them originally as "special bid" units for certain customers that needed a machine with small footprint and better performance than the odd 386SX-16. It turned out to be so good that IBM officially made it Mod. 53. The leading 95- is a result of the onboard Cirrus Logic SVGA - making the units "PS/2 Premium Line" machines. The 9553 uses a SurePath BIOS.

supports only 2, 4, and 8MB 70ns
   The Enhanced 2.88MB Diskette Drive's (#1272, 6451272) electronic diskette eject button feature is supported.  The software-controlled diskette eject feature and the ability to lock a diskette into or out of the drive are not supported.

Remove Password
> We have a PS/2 model 9553 at work, and the previous user (who transferred)left the password 'feature' enabled. How can I reset it? 

Bob Eager
Look for jumper J11, on the right hand side of the system board (looking from the front); about halfway along the edge of the memory connectors, between them and the edge of the board.

This is a 3 pin arrangement with the jumper bridging the middle pin and one other. Move it so that it bridges the middle and the other pin.

Power the machine up. No need to put the jumper back; it's the CHANGE that is detected.

Serial and Parallel Ports
   Serial ports use IRQ 3 and 4 with MANY IO choices
   Parallel port is DMA arbitrated and uses IBM IO and IRQ7 only.

IDE Controller Trivia
  From the planar ADF: PE3FE.ADF (on the refdisk)

   Scroll down to the last section in the Planar ADF and you will see:

NamedItem Prompt "ATA Fixed Disk"
        choice "Enabled"
                pos[20]=XXXXXX11b io 1f0h-1f8h int 0eh
;       choice "Alternate"
;               pos[20]=XXXXXX01b io 170h-178h int 0eh
        choice "Disabled"

  If you want to use the alternate IRQ14/IO170h-178h, remove both of the ";" from this section. Save the file and reboot with the refdisk.

ATA Fixed Disk
    <"Enabled" (1f0h-1f8h int 14)> Disabled
  These options are commented out: Alternate (170h-178h int 14)

Floppy Cable Hack (71G6009)
  These little dapper devils are relatively simple. Parts: 40 pin IDC, Clone floppy cable

   The cable goes straight from the 40 pin header out to the first floppy connector, then it twists pins 10-16 around, then continues with pins 17-34

    Take needlenose pliers, pull the insulation displacing points on the 40-pin header at 3, 6, 35, 36, 37, and 39. Leave 38 and 40 at the end. 

           Now measure out 9". You should have about 2" past the 40 pin header.  Now bring out 3 and 6, cut the rest of the conductors flush at the 40 pin. Now bring them around the back, over 38 and 40 and exit the connector  towards the 34 pin header. Crimp. A little ticklish getting 3 and 6 onto the slots of 38 and 40, but it's sooo much neater.

Windows 95 drivers
  The "Cirrus Logic" driver included in the Windows 95 distribution disk(s) should support most implementations of the CL-GD542X chips, but only if it has a video BIOS version of 1.30 or newer.
   Check this with MSD, IDCHIP.EXE, or a similar utility. If you have a BIOS that is to old you must get a update from the video board manufacturer to use Win95 with your board.

Graphic Modes Supported 

Graphics      Color/   ----------------------    ---------------
Modes         Pallet   DOS   Windows*  OS/2      VERTICAL (Hz)
===========--========  ====--=======---======    ===============
640 x  480   16/256K  Y(i)    Y       Y          60, 72
640 x  480  256/256K  Y       Y       Y(a)       60, 72
640 x  480  32K       -       -       -          60, 72
640 x  480  64K       -       Y       -          60, 72
640 x  480  16M       -       Y       -          60

800 x  600   16/256K  Y       Y       Y(b)       56, 60, 72
800 x  600  256/256K  Y       Y       Y(a)       56, 60, 72
800 x  600  32K       -       -       -          56
800 x  600  64K       -       Y       -          56, 60

1024 x  768   16/256K  Y       Y       Y(b)       60, 70, 72, 87(c)
1024 x  768  256/256K  Y       Y       Y(i,a)     60, 70, 72, 87(c)

Note (i) ISO certified with specific fonts, typeface, and monitors.
Note (a) Not supported by OS/2* 1.3.x or 2.0 w/o Service Pack.
Note (b) Not supported by OS/2 2.0 with Service Pack or 2.1
Note (c) Interlaced

The system maintains compatibility with CGA, EGA, and VGA modes. 

Power Manageable Display 
   If you have attached to this system a power manageable display that conforms to the\VESA Display Power Management Signaling (DPMS) interface, like IBM 952n or 632n Color Monitors, then using the DPMS enabled BIOS utility package will save you power. The power savings is accomplished by instructing your display to go into various power saving states after a period of user inactivity has been detected. DPMS will put your power manageable display into one of three different states: 

  1.Standby: Minimum power savings but immediate return to ON. 
  2.Suspend: Medium power savings but medium return to ON. 
  3.Off: Maximum power savings but noticeable delay in return to ON. 

The timeout defaults may be changed from 1 to 99 minutes. 

After December 1993, the DOS and Windows* DPMS utility package may be obtained from: 

    IBM PC Company BBS - (919) 517-0001 
    OS/2 BBS accessed via ADVANTIS 
    CompuServe Information Service 

9553 Riser FRU P/N 27F4666

William Walsh says:
  The 72 pin edgecard is for a DBA ESDI hard disk. It's supposedly disabled in the BIOS on the IBM Model 53.

Riser bracket is 27F4599

90-watt worldwide, manual switch, power supply with cooling fan 
average of 1.6 amps per slot

Open the Case
  Use a standard screwdriver to free up the two captive screws on the lower front sides. Slide the top back about 1/2 inch, lift it straight up.

Install Cover
  First, look at the lower rear of the cover. Notice the bottom edge has about a 3/4 inch angle where it does not reach the end. Hold the cover so the back edge is over the rear side of the case. Lower it down until it rests on the case rails, then pull forward.

NOTE! The front bezel snaps onto the case frame. When you open the case, you will have a wide "U" shaped cover in your hand, the front bezel stays put!

Remove Front Bezel
  Remove the cover. Look to the outer side of the speaker/card guide assembly. See the two white latches? Press them outwards and pop that end off. Now look at the other side by the power switch. See the wide latch? Press it inwards and pop the front bezel off.

Ed. it might be a little different way to press the latches, but there are only two choices, and if you can't figure that out, a PS/2 is not for you.

9595 Main Page