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Intel Math CoProcessor Installation and Configuration Notes: I-M
Contents:
F-H - MCP INSTALLATION & SYSTEM CONFIGURATION NOTES: DOCUMENT 3030
FASTDATA
386/25 Intel387 DX
Set pins 1-2 on JP2 and pins 2-3 on JP4
GATEWAY 2000
386SX-16 Intel387 SX
If the system board in this system is produced by MAIN B, with a
Quadtel BIOS, install jumper at JP1 to enable MCP. If system board
is produced by FTK, with American Megatrends BIOS, remove jumper
JPY pins 1-2 to enable MCP.
Intel386/25 and Intel386/Intel387 DX
To enable the mcp you need to set switch bank 1, position 2 to ON.
486-33 MCP on chip
An article in PC Week (Feb 17, 92) described a problem with the
Gateway 2000 Intel486-33 motherboard. The symptom is a system
lockup. The lockup is caused by a timing problem that causes the
mcp in the Intel486 DX to stop functioning before it has finished
its calculations. Gateway is using a Micronics Gemini motherboard.
Micronics says that a minor fix was all that was needed. Gateway
offers a free replacement. Gateway can be reached at 800-846-2301.
HEWLETT PACKARD
VECTRA 287XL
Early Vectras require a "PATCH" program from HP to enable the 287
work.
HYUNDAI
SUPER 386SX-16 Intel387 SX Remove Jumper J13
SUPER 286 287XL Automatically Enabled
The motherboard in this system produces more noise than most.
Since the Intel287XL is more susceptible to noise, this system may
require Intel's NMOS 287-10, which is less susceptible to this
noise.
IBM - MCP INSTALLATION & SYSTEM CONFIGURATION NOTES
PC-1, PC-2, PC/XT, 8087 Switch Block 1, Switch 2 OFF
PORTABLE & 3270 PC
PS/NOTE 386SL Intel387 SL
Model 2141-N82,S82,W82
Problems booting the system have been encountered by customers
whose system board barcode starts with the letter Z. If this is the
case, contact IBM for a system board replacement.
PS/NOTE 425SL Not Upgradeable
This system utilizes a version of Intel486 SL microprocessor which
does not contain a math coprocessor and is not upgradeable with
Intel487SX Math Coprocessor or the Intel OverDrive Processor.
PS/2 Thinkpad 350 & 350C Not Upgradeable
This system utilizes a version of Intel486 SL microprocessor which
does not contain a math coprocessor and is not upgradeable with
Intel487SX Math Coprocessor or the Intel OverDrive Processor.
PS/2 Thinkpad 700, 700C &Intel387 SL
These systems do not utilize the STOP CLOCK mode of the Intel387
math coprocessors.
PS/2 Thinkpad 720, 720C Intel387 SL
These systems do not utilize the STOP CLOCK mode of the Intel387
math coprocessors.
PS/2 MODEL 56 & 57 SLC Intel387 SX-20 or Intel387 SX-25
When this system is upgraded to IBM 486SLC2, it is compatible ONLY
with the BOX387SX-20 or BOX387 SX-25 math coprocessors. It is NOT
compatible with BOX387SX, BOX387SX16-25, BOX387SX33, or BOX387SL.
* IBM PS/2 MODEL 70 & Model 80
The math coprocessor socket used in this computer doesn't have the
traditional beveled corner used for orienting the Intel387 DX.
However, a white outline of the socket on the system board shows a
beveled corner. Align the beveled corner of the Intel387 DX with
the beveled corner on this outline.
PS/2 80/16 (041, 071)* Intel387 DX
Run IBM Reference Diskette. While you run Microsoft Excel, lockups
or General Protection Fault error messages may occur. A software
fix WIN87EM.EXE was created and is available through Intel's online
services. WIN87EM.DLL,another version of this file, is available
from the Microsoft BBS and Microsoft forum of CompuServe.
PS/2 80/20 (111, 311)* Intel387 DX
Run IBM Reference Diskette. While you run Microsoft Excel, lockups
or General Protection Fault error messages may occur. A software
fix WIN87EM.EXE was created and is available through Intel's online
services. WIN87EM.DLL, another version of this file, is available
from the Microsoft BBS and Microsoft forum of CompuServe.
IBM PS/1
There are now two different IBM systems with the same name. One is
an older 8086-based system that was intended for the home PC
market, it had very limited expansion, and an integrated monitor on
top of the PC. The newer PS/1 has a model number of C92, is based
on the Intel386 SX-16.
IBM PS/2 XMA Card and the Intel387 DX
Field reports the XMA2EMS device driver causes Lotus 1-2-3 to fail
floating point math operations if the Intel387 DX MCP is installed
in a PS/2 Model 80. Contact IBM or Lotus to see what fix, if any,
is available.
I-L - MCP INSTALLATION & SYSTEM CONFIGURATION NOTES
INSIGHT
386DX-25 With Armas ICM25-2 Motherboard
Jumper JP4 pins 2-3, and JP7 ON
INTEL
301 SYSTEM BOARD
PBA 451213-xxx Intel387 DX
Remove jumper from E48-E49. Place jumper across E46-E47
PBA 149422-xxx 287XL (SBC Math) with 387 socket
PBA 451403-xxx 287XL (SBC Math) with 387 socket
Early versions of this system board don't support the 387DX.
The "PBA" number on a sticker in a corner of the system board
determines its version.
302 System Board Intel387 DX
On PBA # 503081-004, there is no jumper; the system is autosense.
303 System Board Intel387 DX
There are three versions of this motherboard. Two of the versions
require you to set a jumper. These can be identified by their
PBA#.
On PBA # 500704 and PBA # 459699
E43-E44 = MCP Installed
E44-E45 = MCP Not Installed
On PBA # 502557 there is no jumper; the system is autosense.
INBOARD 386 AND 386/PC Intel387 DX
On the Intel Inboard 386 accelerator board, the orientation of the
386DX is not the same as the 387DX.
SnapIn 386 287XL
The SnapIn 386 uses the math socket on the motherboard.
LASER
386SX-16 (slim line case)Intel387 SX
Jumper JP40 needs to be moved from 2-3 to 1-2. Pins 1-2 are nearest
to the Silk screened "NPX" on system board.
386SX-16 (large box) Intel387 SX
There are no jumpers or switched to set.
386SXE Intel387 SX
Jumper JP16 needs to be moved from 2-3 to 1-2. Pins 1-2 are nearest
to the Silk screened "NPX" on system board.
386SXT Intel387 SX
Needs to have jumper J2 installed.
LEADING EDGE
386SL Color Notebook Intel387 SL
Customer report: When i387 SL was installed, system passed all
Intel diagnostic tests except Conformance Test, which failed
randomly. All applications ran flawlessly. Contact Leading Edge
for BIOS upgrade.
MODEL M 8087 Switch-block 3: 6-OFF, 7-OFF
8087-2 Switch-block 3: 6-On, 7-OFF
The Model M requires a special software program to enable 8087.
Call Leading Edge Technical Support at 900-370-4800.
M - MCP INSTALLATION & SYSTEM CONFIGURATION NOTES
MAGNAVOX
Headstart 500 Intel387 SX
Remove jumper from W12. Set jumper W8 pins 1-2 (When looking at
front of computer, pins 1&2 are the right and middle pins.
MITSUBA
NINJA-12 Intel287 XL
The documentation calls for the C80287A-10. For more details,
contact Mitsuba Tech support.
MITSUBISHI
MP286L Intel287 XL
If you purchased the MP286L without the math coprocessor,
Mitsubishi requires you to send the MP286L with the proper math
coprocessor to their service center in California for installation.
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