8580 Planar Memory

Pinout Comparison with 72-pin SIMMs (from Peter)

Planar Memory Cards
Planar Memory Sizes
   System Support of Planar Memory Sizes
Memory Card Connector
Planar Memory Pinout
   Presence Detection


Planar Memory Cards (thx to David Beem for the ref. photos)

IBM 1 MB Memory Card

P/N 15F6821, 4098553* [P] [P] [P]

J1? Planar connector
U1-9 89X8921(ESD) or 6470780(ESD)* 1Mbit DRAM?

(no components on the solder side)

IBM 1 MB Memory Card

P/N 15F6820, 4098539(A)* [P] [P] [P] [P]

J1? Planar connector
U1-3 90X0713(ESD) or 6161807(ESD)* [yellow]
U4-6 90X0712(ESD) or 6161808(ESD)* [green]
U7-9 90X0710(ESD) or 6161810(ESD)* [blue]
U10-12 90X0711(ESD) or 6161809(ESD)* [red]

Uses the same chips as the 2 MB 92F0664 card.
The same chips are also used on the 24F0312 72-pin 2 MB SIMM (in the same 4x3 configuration).

(no components on the solder side)

IBM 1 MB Memory Card

P/N 72X7475(A), 90X9438 [P] [P] [P]

J1 Planar connector
U1-9 90X0706(ESD) or 89X9822(ESD) or 89X9430(ESD)? [yellow]
U10-18 90X0705(ESD) or 89X9821(ESD) or 89X9429(ESD)? [green]

(no components on the solder side)

IBM 1 MB Memory Card

P/N 15F6773 [P] [P]

J1 Planar connector
U1-8 89X9809(ESD) [yellow]
U9 89X9822(ESD) [white]
U10-17 89X9831(ESD) [green]
U18 89X9821(ESD) [grey]

Appears to be the same PCB as 72X7475(A) above.

(no components on the solder side)

IBM 2 MB Memory Card

FRU P/N 92F0669, P/N 92F0664 [P] [P] / FRU P/N 90X7391, P/N 15F6824 [P]

J1 Planar connector
U1-6 90X0710(ESD) [blue]
U7-12 90X0711(ESD) [red]
U13-18 90X0712(ESD) [green]
U19-24 90X0713(ESD) [yellow]

Uses the same chips as the 1 MB 15F6820 card.

(no components on the solder side)

IBM 2 MB Memory Card

P/N 90X8670 [P] (src)

J1 Planar connector

Other parts currently unknown.

(no components on the solder side)

IBM 2 MB Memory Card

FRU P/N 90X7391, P/N 90X9019 [P] / P/N 90X8993 [P] (src) / P/N 15F6823(F)* [P]

J1 Planar connector
U1-6 IBM 6161756 or 6161766* [yellow]
U7-12 IBM 6161755 or 6161765* [green]
U13-18 IBM 6161754 or 6161764* [blue]
U19-24 IBM 6161753 or 6161763* [red]

(no components on the solder side)

IBM 2 MB Memory Card

FRU P/N 92F0669, P/N 92F0662 [P] / P/N 15F6822 [P] [P]

J1 Planar connector
U1-18 89X8922

(no components on the solder side)

IBM 2 MB Memory Card

FRU P/N 90X7391, P/N 15F6825 [P]

J1 Planar connector
U1-8,10-17 Panasonic MN41C4256SJ-08 256Kx4 DRAM [yellow]
U9,18 89X8922 (parity?) [green]

(probably no components on the solder side)

An unusual combination of IBM and Panasonic memory devices. The PCB was designed specifically for this combo it seems.

Similar to the 90X9009 386 Memory Exp. Adapter Daughter Card.

IBM 4 MB Memory Card

FRU P/N 34F0023 or 33F5538*, P/N 33F5498 [P] [P]

J1 Planar connector
U1-36 89X8922 or 23F7261 or 23F7233*

(only bypass caps on the solder side)

Marked as "4MB SYSTEM BOARD MEMORY III" on the PCB.
Based on the silkscreen format and IC plant code 93 this card was most likely designed and manufactured by IBM Japan.

Kingston KTM-4000/M80 4 MB Memory Card (REV.A00) [P] [P]

Front Side

J1 Planar connector
U1,2 Am2966PC octal DRAM driver
U3-10,15-22 KM44C256AJ-8 256Kx4 DRAM
U11-14,23-26 KM41C256J-7 256Kx1 DRAM (parity)


Back Side

U27-34,39-46 KM44C256AJ-8 256Kx4 DRAM
U35-38,47-50 KM41C256J-7 256Kx1 DRAM (parity)


Planar Memory Sizes

System Board 16 MHz (8580-041, 071) 33F8416
1 MB 80 ns Memory Kit (for 33F8416) 72X6670 or 6450375

72X7475 found

System Board 20 MHz 10G4148 (8580-081, 111, 121, 161, 311, 321)
2 MB 80 ns Memory Kit (for 92F0756) 92F0669 or 6450379

92F0669 found. 90X7391 in Jan 1992 Pocket Ref Manual.

System Board 25 MHz 85F0046 (8580-A21, A31, A61)
4 MB 80 ns Memory Kit (for 85F0046) 92F0106 or 6451060

33F5498? 34F0023 in Jan 1992 Pocket Ref Manual.

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 25 MHz 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:

Size16 MHz20 MHz25 MHz
1 MBOKOKER. 225
2 MBOKOKER. 225
4 MB2 MBOKOK

Note 1: 16 MB planar can use 4 MB card, but can only use 2 MB. [ed.]

Note 2: ER. 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.


Memory Card Connector

DIN 41612 Type R - 96-contact inverse female three row connector (90° pin termination)

Hi-Con Type-R Series 130
Hi-Con Overview Chart


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.

Row ARow BRow C
PinI/OSignalPinI/OSignalPinI/OSignal
A1N/AReservedB1N/AGroundC1I/OMD0
A2I-MWB2N/A+5 VdcC2I/OMD1
A3IMA0B3N/AGroundC3I/OMD2
A4IMA1B4N/A+5 VdcC4I/OMD3
A5IMA2B5N/AGroundC5I/OMD4
A6IMA3B6N/A+5 VdcC6I/OMD5
A7IMA4B7N/AGroundC7I/OMD6
A5IMA5B8N/A+5 VdcC8I/OMD7
A9IMA6B9N/AGroundC9I/OMD8
A10IMA7B10N/A+5 VdcC10I/OMD9
A11IMA8B11N/AGroundC11I/OMD10
A12I-RAS0B12N/A+5 VdcC12I/OMD11
A13I-RAS1B13N/AGroundC13I/OMD12
A14I-RAS2B14N/A+5 VdcC14I/OMD13
A15I-RAS3B15N/AGroundC15I/OMD14
A16O-RAMHS*B16N/A+5 VdcC16I/OMD15
A17ORB17N/AGroundC17I/OMD16
A18OT2*B18N/A+5 VdcC18I/OMD17
A19I-CAS0B19N/AGroundC19I/OMD18
A20I-CAS1B20N/A+5 VdcC20I/OMD19
A21I-CAS2B21N/AGroundC21I/OMD20
A22I-CAS3B22N/A+5 VdcC22I/OMD21
A23I/OMDP0B23N/AGroundC23I/OMD22
A24I/OMDP1B24N/A+5 VdcC24I/OMD23
A25I/OMDP2B25N/AGroundC25I/OMD24
A26I/OMDP3B26N/A+5 VdcC26I/OMD25
A27I-BE0B27N/AGroundC27I/OMD26
A28I-BE1B28N/A+5 VdcC28I/OMD27
A29I-BE2B29N/AGroundC29I/OMD28
A30I-BE3B30N/A+5 VdcC30I/OMD29
A31I-CASPB31N/AGroundC31I/OMD30
A32OT1B32N/A+5 VdcC32I/OMD31

Note:
   * Type 3 only

-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 2 MB 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
---------------------------------------
              Connector                
---------------------------------------

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.

SizeA16A17A18A32
1 MBXX
2 MBX
4 MBXXX

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.

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
Type 2 are reduced length 16 and 20 MHz planars
Type 3 is the 25 MHz 386 planar
Type 4 is the 25 MHz 486 planar

G = GND measured against Pin 72 (module GND)
- = open connection measured against Pin 72

Content created and/or collected by:
Louis Ohland, Peter Wendt, William Walsh, David Beem, Tatsuo Sunagawa, Jim Shorney, Tim Clarke, Kevin Bowling, Tomáš Slavotínek, and many others.

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