|
2-8MB Memory Expansion, 16-bit (72 pin) Factory Upgraded 2-8MB Memory Expansion 85F0408 / 10G3812 80386 2-8MB Memory Expansion Adapter, 32-bit (72 pin) 2-14MB Enh 80386 Mem Expansion (FDDE, FDDF) Identifying FDDF Old, New, and FDDE BOPT103.EXE - Upgrade SC.EXE and Mem Expansion ADF/ROM Functions of BOPT 512KB/2MB 286 Memory Expansion Adapter 72X8532 / 90X8167  * ADF for FEFE is built into refdisk and not a separate file. 1-8MB 286 Memory Expansion Adapter 1497253 / 61X6752 
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. @F7FE.ADF "IBM Expanded Memory Adapter 0-8 MB XMA" @085.PEP
188-084 IBM Personal System/2
0-8MB Expanded Memory Adapter/A
2-8MB Memory Expansion Adapter, 16-bit P/N 15F8292 @F7F7.ADF - IBM 2-8MB 286/386SX Memory Expansion Option @194.PEP - 
U6 SLA7620F CMOS High Speed Gate Array Datasheet David Beem said: 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. Failing systems with the following: - 2 - 8MB 80286 memory expansion adapter installed, FRU P/N 15F8292 printed on back. - Total of 16MB installed in the system. - System fails with a 19498-16xxx POST error. Some 2 - 8MB memory expansion adapters may fail with a POST error of 19498-16xxx (xxx can be any number). This is a false error in systems with 16MB total installed memory, and can be corrected by replacing the memory adapter EPROM. PS/2 systems that support the 2-8MB 80286 memory expansion option should not be configured with more than 16MB total memory. If more than 16MB is installed, a 19498 POST error is valid and will not be corrected by EPROM replacement. If the system displays the 19498-16xxx error code, replace adapter EPROM with FRU P/N 57F2905. In systems with two 2-8MB adapters installed, replace the EPROM on both cards. The 2 - 8MB adapter has only one EPROM socket, located along the top edge of the card at location U1. A correctly installed EPROM will have its small notch facing left, away from the bus connector. Until the EPROM is replaced, a 19498 error may be bypassed with the F1 key, leaving the system fully functional. Factory Upgraded 2-8MB Memory Expansion, Front 85F0408 / 10G3812  Factory Upgraded 2-8MB Memory Expansion, Rear 85F0408 / 10G3812  Oh, it finally makes sense.... The 2-8MB Memory Expansion P/N 15F8292 was probably upgraded at factory (the stickers are perfectly aligned) with the 57F2905 EPROM -AND- had a sticker to cover the original FRU - P/N on the back. I expect if you carefully peeled up the right hand sticker, you would see 15F8292 I've not seen any references to adapter rework or defective components. It appears the only difference between the 15F8292 and the later 85F0408 is the 57F2905 EPROM. No, I don't have the BIN file for the 57F2905 EPROM. Sorry... 2-8MB Memory Expansion
Adapter 32-bit
90X9556 or 90X9369 @FCFF.ADF - IBM 0-8MB 386
Memory Expansion Adapter
2 meg 85ns SIMMs - FRU # 92F0104 (option number 6450604) U19 SLA7340F1A CMOS High Speed Gate Array Datasheet 2-14MB Memory Expansion Adapter FDDF and FDDE FDFF 34F2825 Enhanced 80386 Memory Expansion Adapter (old 2-14) - FRU P/N 87F9916 IBM PS/2 Enh. 80386 Memory Exp. Adapter (old, resistors added) - IBM PS/2 Enhanced 80386 Memory Expansion Adapter (new) white socket FDDE 88F0075 Enhanced 80386 Memory Expansion Option (FDDF plus 8K EEPROM) Ed Avis confides to the world:
- 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[out] ROM', I don't know if there is any difference in use. Supports 1MB, 2MB, and 4MB 80nS or 85nS IBM
memory. Identifying
the FDDE, FDDF (old) and FDDF (new) Adapters
The FDDF (old), FDDF (new) and FDDE all use the L1A4452
/ 49F5505 chip. P/N 49F5507-on adapters manufactured before July 1,
1990 Option - P/N 87F9916 –
possible error codes are 231, 241 and 251. There are
no components between the SIMM sockets. Adapter - P/N 88F0075 –
possible error codes are 18431, 18441 and 18451. IBM Enhanced 80386 Memory
Expansion Adapter Enhanced 80386 Memory Exp.
Adapter FDDF (old) Enhanced
80386 0-14MB Memory Adapter/A 49F5507 or 87F9819 U8 bel A447-0150-28 / 72X8359 Delay Module, 150nS total
delay The IBM Enh. 80386 Memory Exp. Adapter
(FDDF old) totally lacks the resistor networks between
the SIMM sockets. It only has two epoxy coated
capacitors on the left edge (not three). ECA042 recalls the 49F5507 and replaces it with the
88F0075 -IF- 4MB SIMMs are to be used on it. 1MB and 2MB
SIMMs are unaffected. Uplevel options 34F3011 and
34F3077 which use FRU P/N87F9916, replace option 34F2811
which used FRU P/N34F2825. This is done as a
precautionary measure due to the possibility of
undetected data modification with 4MB SIMM(S) installed
on this adapter. FDDF (old, patched) Enhanced 80386 0-14MB Memory Adapter/A Jelte sent this in. P/N 34F3011 FRU 87F9916 - PCB
is 34F3053
From my stash, no jumper wires, but diagonal wirewound
resistors. Jelte's card has the equivalent resistor
connected across pins of U21-U24, plus more rework. I
must czech my card's PCB FRU against his, mine might
have a downlevel PCB, lacking the changes to inner PCB
traces. Or, maybe not. It is an IBM thing... 
Systems which have the Enhanced 80386 Memory Expansion adapter installed (FRU P/N 34F2825) may also experience OS/2 TRAP Errors if the Enhanced 80386 Memory Adapter does not have resistors located diagonally across the modules located in positions U21, U22, U23, AND U24. RETAIN RECORD #H037481 should be referenced for additional details.
H035585
Capacitors May Obstruct SIMM Placement On
Adapter A few Enhanced 80386 Memory
Option Adapters may have capacitors obstructing SIMM
placement. SIMMs
which are not fully seated can create intermittent
memory failures. J2: Gently bend C3 45 degrees to
the right of J2 NOTE:
This applies ONLY to the 80386 Memory Expansion
Adapters with capacitors
under the RIGHT end of a SIMM connector. All later
versions have relocated the capacitors from under
the RIGHT end of SIMM connectors to the RIGHT of the
SIMM connectors. FDDF (new) Enhanced 80386 0-14MB Memory Adapter/A 88F0075
NOTE: The FDDF card
supports enabling or disabling Matched Memory. "Matched Memory Cycles" NOTE: Further
meditations on "The Micro Channel Architecture Handbook"
leaves me with the impression that the MMC is not
limited to only the 8580-16MHz, the 8570-Bxx, and the
8573-P75. It says the system figures out what it can
support. FDDE Enhanced 80386 0-14MB Memory Option 88F0075 / 95F1155 @FDDE.ADF - IBM Enh. 80386
Memory Exp. Adapter w/ROM 2-14mem.exe
Files for 2-14MB 80386 Memory Expansion Adapter
U4 HN58C65FP-25T
EEPROM, 8192-Word x 8-bit CMOS ROM datasheet
Which makes me wonder which came first. My Pocket Reference sez Option# FRU
# Feature
Code Description
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 a 70/80) bopt103.exe BOPT103 Upgrade Note - Your
Reference Diskette MUST be: 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 do? In simple words the BOPT workaround
asks you to install a maximum of 15MB on the systemboard
and the FDDE card leaving a 1MB "addressing 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. |
