14.4.1 PS2-1040ST

Try to use a 72-pin 4MB PS/2-SIMM

    72 pin SIMM
   ---------------------------------------
   |                                     |
    )                 _                  |
    --|||||||||||||||/ \|||||||||||||||---
      1             36 37             72


 get the old ram out or disconnect it (it is placed under
 the powersupply) and solder thin wire directly to the
 simm (perhabs you have a simmsocket, this makes it easier)

 --------------------------------------------------------------------------
 1 -  GND     13 - A1      25 - D22      37 - DP1     49 - D8      61 - D13
 2 -  D0      14 - A2      26 - D7       38 - DP3     50 - D24     62 - D30
 3 -  D16     15 - A3      27 - D23      39 - GND     51 - D9      63 - D14
 4 -  D1      16 - A4      28 - A7       40 - /CAS0   52 - D25     64 - D31
 5 -  D17     17 - A5      29 - NC       41 - /CAS2   53 - D10     65 - D15
 6 -  D2      18 - A6      30 - VCC      42 - /CAS3   54 - D26     66 - NC
 7 -  D18     19 - NC      31 - A8       43 - /CAS1   55 - D11     67 - PD1
 8 -  D3      20 - D4      32 - A9       44 - /RAS0   56 - D27     68 - PD2
 9 -  D19     21 - D20     33 - /RAS3    45 - /RAS1   57 - D12     69 - PD3
 10 - VCC     22 - D5      34 - /RAS2    46 - NC      58 - D28     70 - PD4
 11 - NC      23 - D21     35 - DP2      47 - /WE     59 - VCC     71 - NC
 12 - A0      24 - D6      36 - DP0      48 - NC      60 - D29     72 - GND

 DP0..DP3: only modules with Parity

 DP0,D0..D7:   /CAS0
 DP1,D8..D15:  /CAS1
 DP2,D16..D23: /CAS2
 DP3,D24..D31: /CAS3

 D0..D15:  /RAS0, /RAS1 ( doublesided-module)
 D16..D31: /RAS2, /RAS3 ( doublesided-module)

 ----------------------------------------------------------------------------
 connect this way:

 SIMM    ST

 RAS0    RAS0
 RAS2    RAS1
 CAS0    CAS0L
 CAS1    CAS0H
 CAS2    CAS1L
 CAS3    CAS1H

 D0-D16  D0
 D1-D17  D1
   :      :
 D15-D31 D15

 A0      MAD0
  :       :
 A9      MAD9

 DP0     Vcc
 DP1     (all four together at 1-10kOhm to Vcc)
 DP2
 DP3

 WE      WE

 Vcc     Vcc (+5V)
 GND     GND

 ------------------------------------------------------------------------

 You may find the ST-Connections here:

   Data   : directly at the Shifter Pin 3-10  (D0-D7)
                                    Pin 12-19 (D8-15)
            or at the two 74LS244   Pin 3,5,7,9,12,14,16,18
   Address:
            at the 33 Ohm Resistors (orange-orange-black)
            to the MMU (it is marked as C025912-38)
            59=MAD0
            58=MAD1
            57=MAD2
            56=MAD3
            55=MAD4
            54=MAD5
            60=MAD6
            62=MAD7
            63=MAD8
            66=MAD9  (Pin 64 PLCC-MMU)

            23=/W

            for these use the 68 Ohm Resistors (blue-gray-black)
            08=/RAS0    Bank 0
            07=/CASOL   Bank 0
            06=/CAS0H   Bank 0
            18=/RAS1    Bank 1
            21=/CAS1L   Bank 1
            22=/CAS1H   Bank 1