+----------------------------------------------------------------------+ | | | PIN-OUT COMPARISON CHART | | | +----------------------------------------------------------------------+ | | | 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 | Adress 0 | O | 12 | | A04 | O | -MA 1 | Adress 1 | O | 13 | | A05 | O | -MA 2 | Adress 2 | O | 14 | | A06 | O | -MA 3 | Adress 3 | O | 15 | | A07 | O | -MA 4 | Adress 4 | O | 16 | | A08 | O | -MA 5 | Adress 5 | O | 17 | | A09 | O | -MA 6 | Adress 6 | O | 18 | | A10 | O | -MA 7 | Adress 7 | O | 28 | | A11 | O | -MA 8 | Adress 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 | +-----+------+----------------------+----------------------+------+----+ | | | | Presence Detect 0 | I | 67 | | | | | Presence Detect 1 | I | 68 | | | | | Presence Detect 2 | I | 69 | | | | | Presence Detect 3 | I | 70 | +-----+------+----------------------+----------------------+------+----+ Note *1) This contact is tied to GND if the module is High Speed (80ns) Note *2) This contact is tied to GND to signal installed module Note *3) If T1=NC and T2=GND the module is 4MB (only for 25MHz-boards) Note *4) If T1=GND and R=GND there is a 1MB module installed (16MHz only) If T1=NC and R=GND there is a 2MB module installed (20Mhz only) T2 is not present on 16 & 20MHz platforms and may not be used PS/2 Model 80 Presence Detection - Possible Combinations +----+----+----+-------------------------------------------------+ | R | T1 | T2 | Module Presence / Type Pins | +----+----+----+-------------------------------------------------+ | NC | X | X | No module present in | | G | G | X | 1MB module installed (16MHz planar) | | G | NC | X | 2MB module installed (20MHz planar) | | G | NC | G | 4MB module installed (25MHz planar) | +----+----+----+-------------------------------------------------+ PS/2 Model 70 Presence Detection - Possible Combinations 7 6 6 6 0 9 8 7 <---- Module Pins +---+---+---+---+---------------------------------------------+ | 3 | 2 | 1 | 0 | Presence Detect Value | +---+---+---+---+---------------------------------------------+ | - | - | - | - | No module present (All planars) | | G | G | - | G | 1 MB / 100ns Parity (Type 1 planar only) | | G | G | G | - | 2 MB / 100ns Parity (Type 1 planar only) | | G | - | - | G | 1 MB / 85ns Parity (Type 1 + 2 planar) | | G | - | G | - | 2 MB / 85ns Parity (Type 1 + 2 planar) | | - | G | G | - | 2 MB / 80ns Parity (Type 3 + 4 planar) | +---+---+---+---+---------------------------------------------+ R1 R2 <---- Memory coding on original IBM-modules Type 1 are the full lenght 16 and 20MHz planars Type 2 are the reduced lenght 16 and 20MHz planars Type 3 is the 25MHz 386 planar Type 4 is the 25MHz 486 planar G = GND measured against Pin 72 (module GND) - = open connection measured against Pin 72