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From Peter:
How about that comparison chart below? I once made it to build a
"Model 80 to 72-pin SIMM" converter - an attempt that failed so far for various
reasons (lack of time mostly).
IBM PS/2 Mod 80 IBM PS/2 Mod. 70
Memory Daughter Card 72-pin SIMM
A01 NA Reserved
A02 O -Memory Write Write Enable O 47
A03 O -MA 0 Address 0 O 12
A04 O -MA 1 Address 1 O 13
A05 O -MA 2 Address 2 O 14
A06 O -MA 3 Address 3 O 15
A07 O -MA 4 Address 4 O 16
A08 O -MA 5 Address 5 O 17
A09 O -MA 6 Address 6 O 18
A10 O -MA 7 Address 7 O 28
A11 O -MA 8 Address 8 O 31
A12 O -RAS 0 RAS 0 O 44
A13 O -RAS 1 RAS 1 O 45
A14 O -RAS 2 RAS 2 O 34
A15 O -RAS 3 RAS 3 O 33
A16 O -RAMHS (Type 3) 1
A17 O -R (Mod. inst.) 2
A18 O T2 (Type 3) 3
A19 O -CAS 0 CAS 0 O 40
A20 O -CAS 1 CAS 1 O 43
A21 O -CAS 2 CAS 2 O 41
A22 O -CAS 3 CAS 3 O 42
A23 IO -MPD 0 Parity Data 0 IO 36
A24 IO -MPD 1 Parity Data 1 IO 37
A25 IO -MPD 2 Parity Data 2 IO 35
A26 IO -MPD 3 Parity Data 3 IO 38
A27 O -BE 0 Block Select 0 O 29
A28 O -BE 1 Block Select 1 O 46
A29 O -BE 2 Block Select 2 O 66
A30 O -BE 3 Block Select 3 O 71
A31 O -CASP -CAS P O 11
A32 O T1 (Mod. Size) 4
B01 NA Ground Ground NA 1
B02 O +5VDC +5VDC O 10
B03 NA Ground Ground NA 39
B04 O +5VDC +5VDC O 30
B05 NA Ground Ground NA 72
B06 O +5VDC +5VDC O 59
B07 NA Ground
B08 O +5VDC
B09 NA Ground
B10 O +5VDC
B11 NA Ground
B12 O +5VDC
B13 NA Ground
B14 O +5VDC
B15 NA Ground
B16 O +5VDC
B17 NA Ground
B18 O +5VDC
B19 NA Ground
B20 O +5VDC
B21 NA Ground
B22 O +5VDC
B23 NA Ground
B24 O +5VDC
B25 NA Ground
B26 O +5VDC
B27 NA Ground
B28 O +5VDC
B29 NA Ground
B30 O +5VDC
B31 NA Ground
B32 O +5VDC
C01 IO Data 00 Data 00 IO 2
C02 IO Data 01 Data 01 IO 4
C03 IO Data 02 Data 02 IO 6
C04 IO Data 03 Data 03 IO 8
C05 IO Data 04 Data 04 IO 20
C06 IO Data 05 Data 05 IO 22
C07 IO Data 06 Data 06 IO 24
C08 IO Data 07 Data 07 IO 26
C09 IO Data 08 Data 08 IO 49
C10 IO Data 09 Data 09 IO 51
C11 IO Data 10 Data 10 IO 53
C12 IO Data 11 Data 11 IO 55
C13 IO Data 12 Data 12 IO 57
C14 IO Data 13 Data 13 IO 61
C15 IO Data 14 Data 14 IO 63
C16 IO Data 15 Data 15 IO 65
C17 IO Data 16 Data 16 IO 3
C18 IO Data 17 Data 17 IO 5
C19 IO Data 18 Data 18 IO 7
C20 IO Data 19 Data 19 IO 9
C21 IO Data 20 Data 20 IO 21
C22 IO Data 21 Data 21 IO 23
C23 IO Data 22 Data 22 IO 25
C24 IO Data 23 Data 23 IO 27
C25 IO Data 24 Data 24 IO 50
C26 IO Data 25 Data 25 IO 52
C27 IO Data 26 Data 26 IO 54
C28 IO Data 27 Data 27 IO 56
C29 IO Data 28 Data 28 IO 58
C30 IO Data 29 Data 29 IO 60
C31 IO Data 30 Data 30 IO 62
C32 IO Data 31 Data 31 IO 64
Reserved NA 19
Reserved NA 32
Reserved NA 48
PD 0 I 67
PD 1 I 68
PD 2 I 69
PD 3 I 70
Notes:
- Contact is tied to GND if the module is High Speed (80 ns)
- Contact is tied to GND to signal installed module
- If T1=NC and T2=GND the module is 4 MB (25 MHz-boards only)
- If T1=GND and R=GND the module is 1 MB (16 MHz boards only)
If T1=NC and R=GND there is a 2 MB module installed (20 MHz only)
T2 is not present on 16 & 20 MHz platforms and may not be used
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