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IBM Planar Memory Cards IBM Planar Memory Cards
Note: There are a few different layouts on the 1 MB size. 8580 Planar Memory Sizes
System Board 16 MHz (8580-041, 071) 33F8416 8580 System Support of Planar Memory Sizes (From Fred Spencer, original HERE) On the initial 8580 models, only 1 MB and 2 MB planar memory modules were available. With the announcement of the 25MHz planars (8580-Axx), 4 MB memory cards became available. However, it has been discovered that they will function on the 20 MHz planars (thanks to Tim Clarke and Joe Kovacs for this discovery). A summary table of my experiences using various sizes of memory cards in each of the three categories of planars follows:
Note 1: 16 MB planar can use 4 MB card, but can only use 2 MB. [ed.] Note 2: 225 is the POST Error Code resulting from having memory that is too slow. Note 3: On some 20 MHz planars with 4 MB memory cards on the planar, the IBM diagnostics will occasionally fail, but the memory will still function OK. With the PIICEON 4 MB (70 ns) memory card the IBM diagnostics may also fail. However, both the IBM and PIICEON 4 MB memory cards will function properly and they do pass the Norton Utilities memory diagnostics without any problems. I will be doing more investigation regarding this. Planar Memory Pinout The Type 1, 2, and 3 system boards are equipped with two 3- by 32-pin system board memory connectors. A memory card must be installed in connector 1 before additional memory can be used in the channel. The following figure shows the pin locations of the 3- by 32-pin system board memory connectors. The pin locations are the same for connectors 1 and 2. Connector 1 is closest to the power supply. Pin 32 is closest to the rear of the system board. 
Note: -MW: -Memory Write -MA(0 - 8): -Memory Address (0 through 8) -RAS(0 - 3): -Row Address Strobe (0 through 3) -CAS(0 - 3): -Column Address Strobe (0 through 3) -CASP: -Column Address Strobe Parity MDP(0 - 3): Memory Data Parity (0 through 3) MD(0 - 31): Memory Data (0 through 31) -BE(0 - 3): -Byte Enable (0 through 3) R: This signal is used with the 'T' signal (pin A32) by the Memory Card Definition register (POS Register 3) to indicate the presence of memory in each of the two system board memory connectors. See" Memory Card Definition Register" on page 2-36 for additional information. Note: Type 2 system board POST routines require a minimum of 1 MB of functional memory installed in connector 1. The Type 1 system board also requires a minimum of 1 MB of functional memory; however, it may be installed in either connector. The Type 3 system board POST routines require 4 MB of functional memory installed in connector 1.T1, T2: These signals are used with the 'R' signal (pin A17) by the Memory Card Definition register (POS Register 3) to indicate the presence of memory in each of the two system board memory connectors. See Section 2, "Programmable Option Select," for additional information. -RAMHS: This signal is used by POS Register 4 to detect the memory speed. David Beem insinuates:The connector is 3 rows (A, B, & C) by 32 columns. These are marked well, except for the 2Mb board. Put it chip-side down, connector at the bottom. The solder pads for the connector on the circuit board now have pin A1 in the lower lefthand corner, something like this:
Solder Side
C1 oooooooooooooooooooooooooooooooo C32
B1 oooooooooooooooooooooooooooooooo B32
A1 oooooooooooooooooooooooooooooooo A32
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Connector
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Presence Detection We are mainly interested in pins A17 & A32, wired on all Model 80 types, & pins A16 & A18, N/Cs on the Type 1 planars, wired for the Type 2 and 3 planars. An 'X' on the chart means the pin is tied to ground.
This explains why the 4 MB modules are
treated as 2 MB in a Type 1 planar. I don't know if any
of the presence detects signify memory speed. The chart
above shows the newer 2 MB board. Another surprise is the
little memory cards that go on the @FAFF.ADF 2 - 6 MB 386
Memory expansion board are the same pinouts. Of course
each board is 2 MB & the presence detect is the same
as above. I don't believe this board was offered in any
other capacity. You can use one of these little cards on
the planar, although it has to be in the slot furthest
from the power supply due to the keying &
right-angle of the connector. At least the chips are
conventional & marked as 85 ns. From Peter: Pinout Comparison with 72-pin SIMMs
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:
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 1 MB module installed (16 MHz planar) G NC X 2 MB module installed (20 MHz planar) G NC G 4 MB module installed (25 MHz 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 / 100 ns Parity (Type 1 planar only) G G G - 2 MB / 100 ns Parity (Type 1 planar only) G - - G 1 MB / 85 ns Parity (Type 1 + 2 planar) G - G - 2 MB / 85 ns Parity (Type 1 + 2 planar) - G G - 2 MB / 80 ns Parity (Type 3 + 4 planar) +---+---+---+---+-----------------------------------+ R1 R2 <---- Memory coding on original IBM-modules
Type 1 are full length 16 and 20 MHz planars
G = GND measured against Pin 72 (module GND) |
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