Computer (EPC) Index
EXM - EXpansion Module
Inserting an EPC into an EXM
Note: Make sure that
power to your system is off. The EPC-23 is not designed to
be inserted or removed from a live system.
Notice: Use of any of
the files or information on this page is
AT YOUR OWN RISK. If you want
a guarantee on this stuff, seek out any repair / service
company that supports EXM / EPC devices.
If you have any files or experience with these devices, please reach to
CPU (25 MHz Intel 486 SL)
Chip on left is KU82360SL, chip in center is KU80486SL-25.
SIMMs that I have seen are Toshiba THM361000ASG-80 and
Notice the two vertical sets of solder pads for Base Memory.
H2 - Jumper for BIOS update?
H3 - solder pads
EPC-23 Base Memory
The EPC-23 has a base memory of 0MB, 1MB or 4 MB. Base
memory is soldered on.
Note: The "23-25 1MEG"
has two HM514280LJP8 soldered on the EPC.
80nS FPM SIMM, single-sided or thin double-sided (uses
TSOP packaged DRAMs)
EPC-23 Memory Amounts
0MB Base Memory, 4MB or 8MB SIMM, max 8MB.
1MB Base Memory, 4MB or 8MB SIMM, max 9MB.
4MB Base Memory, 4MB or 8MB SIMM, max 12MB.
Floppy Types Supported
360K, 720K, 1.2 MB, 1.44MB, and 2.88 MB. BUT... If you look
at the EMC-FDM, it appears to have a max 500Kbit/s transfer
rate, which suggests to me that it tops out at 1.44MB