IBM Memory Expansion
1-8MB 286 Memory Expansion (30 pin)
2-8MB Memory Expansion, 16-bit (72
80386 2-8MB Memory Expansion Adapter, 32-bit
80386 Mem Expansion (FDDE, FDDF)
FDDF Old, New, and FDDE
BOPT103.EXE - Upgrade SC.EXE
and Mem Expansion ADF/ROM
Memory Expansion Adapter
|U1-4,21-24 30 pin SIMMs
|U14 Firmware 11FB069 '88 or
This adapter provides 1MB of memory expansion with LIM EMS Version
4.0 support for all PS/2 Models 50, 50Z, 55 SX, 60 and 65 SX.
The PS/2 1-8MB 286 Memory Expansion
Option is functionally equivalent to IBM's existing 2-8MB 80286 Memory
Expansion Option (#8286, 6450609), but with 1MB of standard 85ns memory.
It is expandable in increments of 1MB or 2MB up to a maximum of 8MB by
using 1MB SIMMs-85ns or 2MB SIMMs -85n.
2-8MB Memory Expansion
Adapter, 16-bit P/N 15F8292
Scan from Cheers, down in Australia
|CN1-4 72 pin SIMMs
David Beem said:
Tthe IBM "2-8[MB]" 16-bit memory card (P/N
15F8292) has four 72-pin SIMM sockets & an EPROM (on the middle of
the upper edge). If you have the newer EPROM version (copyright 1991 AFAIR)
you can populate all four sockets with 2Mb 80nS SIMMs for an additional
8MB to the possible 55SX planar 8Mb (16Mb, maximum on the 24-bit addressed
For systems with 24 bit addressing and 8MB on planar (like
the 55SX), the older EPROM version prompts about resizing memory with a
non-fatal error requiring a keypress to continue every boot. Once the error
is acknowledged the system is fine from there. In this case, it is better
to populate the last SIMM socket with a 1Mb 80nS module (allowing 15MB
total system memory) in that case (or find someone to burn an EPROM of
the newer version). The card's RAM is treated as being "Extended", same
as the upper planar memory. I treat the newer EPROM as mainly having (other
differences haven't been studied) the "Ok, ok, just cut the memory to size
& don't tell me about it" code.
Cheers reports the older EPROM version as
"Copyright 1989 V2". The newer is a double date of "1990, 1991" AFAIR &
may have "V3". Never have seen the original ("V1", if such thing were marked)
in the wild out of a half-dozen cards. The later version is on less than
half the cards in that same (very) rough sampling.
This card is excellent filling both the 55SX
& 65SX (the only MCA 286/386SX systems able to use it & have 8MB
of planar memory maximum) to capacity with Extended RAM. The 609 or other
16-bit MCA memory cards with software could perhaps eclipse it by supporting
more than 8MB on the card (for something like the 50/50Z/60 models) or
being able to split itself for Extended & Expanded memory.
80386 2-8MB Memory
Expansion Adapter 32-bit 90X9556
Card was donated by David Rees from Ohio.
|CN1-4 72 pin SIMMs
U8,9 150nS delay
2 meg 85ns simms - FRU # 92F0104 (option number 6450604)
Ed Avis confides to the world:
IIRC there were three variants of the 2-14 card:
- without ROM: this writes IADF code to the MBR
of the boot device. Generally a bit of a pain and won't work with Linux
(though I have heard that it works if you use the Minix bootloader to boot
Linux). I already have one of those cards.
- with ROM: this counts its memory at the same
time as the planar memory (like the 2-8 card does) and is easier to install.
Apparently if you have one 'with ROM' card it can also take command of
any 'without ROM' cards and let them work without needing boot track code.
Apparently there are two variants of the 'with
ROM', I don't know if there is any difference in use.
2-14mem.exe Files for
2-14MB 80386 Memory Expansion Adapter
- IBM Enh. 80386 Memory Exp. Adapter w/ROM
- Init file for @FDDE.ADF
Enhanced 80386 Memory Exp. Adapter
- IBM Enh. 80386 Memory Exp. Adapter
- Init file for @FDDF.ADF - required !
- Init file for @FDDF.ADF - required !
- IBM Enh. 80386 Memory Exp. Adpt alt file / more settings
|J1-J4 72 pin SIMM socket
Supports 1MB, 2MB, and 4MB 80nS or 85nS IBM memory.
Mandatory Replacement ENHANCED Enhanced 80386 Memory Expansion ECA
FDDE, FDDF (old) and FDDF (new) Adapters
All three share the same basic outline. The later Enh. 80386
Memory Exp. Adapter (FDDF new) has a single WHITE SIMM socket on the upper
right. The FDDF card supports enabling or disabling Matched Memory.
The IBM Enh. 80386 Memory Exp. Adapter (FDDF old) totally
lacks the resistor networks below the SIMM sockets. It only has two epoxy
coated capacitors on the left edge (not three).
Which makes me wonder which came first. My Pocket Reference
Option# FRU #
Feature Code Description
87F9856 87F0075 9856 4MB Mem
Adpt (32 bit, 80nS)
87F9860 87F0075 2190 4-14MB
Mem Adpt(32 bit, 80nS)
Look below for the latest Enhanced memory adapter update-
BOPT103.EXE, it will update SC.EXE and the BIOS ROM on your adapter.
BOPT103.EXE (>16MB in
bopt103.exe BOPT103 Upgrade
Note - Your Reference Diskette MUST
50/60 version 1.06 or greater
55/65 version 1.04 or greater
70/80 version 1.10 or greater
70-486 version 1.04 or greater
Reference Diskette update is most easily accomplished on
a system with two 3.5 floppy drives. If a single drive is used, diskette
swapping is required (may be as high as 55 swaps). In order for the new
Enhanced Memory Adapter to boot up there must be at least 1Meg of "free"
memory below the 16Meg limit. If the sum of system planar memory and any
non-Enhanced Memory Adapter system memory is 16Meg or more, you must move
some of that memory to the Enhanced Memory Adapter (or remove it from your
system) in order to use the new Enhanced Memory adapter.
What does bopt103.exe
Peter Wendt woolgathers
BOPT103 is a workaround to overcome the 16MB RAM limit on Mod.
70/80 with the crippled DMA with using 1 x FDDE and 1 x FDDF card. It works
- but it blocks two 32-bit slots .... leaving only one single 16-bit slot
on a Mod. 70 ...
In simple words the BOPT workaround asks you to
install a maximum of 15MB on the systemboard and the FDDE card leaving
a 1MB "adressing gap" for the memory on the FDDF card. This results in
a total of 31MB in the best case. Don't know if a second FDDF card is also
supported, but I don't think so.
The better choice is to forget about the FDDE
and FDDF cards and use e.g. a Kingston KTM-64000 or Acculogic Simmply RAM
32-bit card that have own memory mapper and error-detection logic. I have
the Acculogic in one of my Mod. 80-A31 and have a total of 40MB installed.
The KTM should be able to push the memory up to 64MB (8MB on the planar
- 3 x 16MB + 1 x 8MB on the card) - but I haven't got the chance to test
that. The Acculogic supports only 8MB modules.
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