Radisys EPC-26A/27

"Type 4"

EPC-26A/27 Manuals

Inserting an EPC into an EXM Carrier
Note: Make sure that power to your system is off. The EPC-26A / 27 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 Louis Ohland.

EPC-26A / 27 CPU (-26A 486DX2-50, -27 486DX4-100 Enhanced, Pico Power chipset)

H2    Reserved for future use.
H3    Use to enable writing to flash
H4    Do not use
H5    Forces a hosted re-flash of the BIOS. Must jumper H3 also.

Optional Flash/SRAM Memory
The EPC-26A/27 can have 128 KB of SRAM and 2 or 4 MB of flash installed on it. The EPC Flash/SRAM is compatible with the EXM-2A architecture and it appears to software as though there was an integrated EXM-2A in the system.

Note: Software cannot distinguish EPC Flash/SRAM from a separate EXM-2A card using the same configuration. A system cannot enable both the optional Flash/SRAM and an EXM-2A expansion module at the same time.

Note that the XFORMAT program used to format flash memory is also distributed with the EXM-2 and EXM-2A expansion modules. Any references to the EXM-2 and/or EXM-2A are intended to denote your flash memory.

Refer to the XFORMAT Software User’s Manual for more information about formatting SRAM and flash memory.

   Formatting the FLASH memory and creating a bootable drive will take over as the C:, this prevents any DE drive from working. Look in the EXM-2A files for XFORMAT and SRAMDISK.

XFORMAT.EXE    Flash formatting program
SRAMDISK.SYS    SRAM device driver
BB5.00            Boot block files for DOS 5.0
BB6.00            Boot block files for DOS 6.0, 6.1, & 6.2

Booting From Flash Memory Conflicts with IDE Drive
 If you plan to boot from a non-IDE device, such as the resident Flash memory, set the master drive as None and use the BIOS extension.  You cannot boot from Flash and still have an IDE drive;  the IDE drive must be drive C: if it is to be used. Flash BIOS extensions are enabled and configured in the Advanced Menu.

To use an EXM-HD or EXM-MX series mass storage unit, you must configure a master adapter;
EPC-26A / 27 Memory Amounts 
0MB Flash Memory, 4MB, 8MB, 16MB or 32MB SIMM, max 32MB.
2MB Flash Memory, 4MB, 8MB, 16MB or 32MB SIMM, max 32MB.
4MB Flash Memory, 4MB, 8MB, 16MB or 32MB SIMM, max 32MB.

Note: The Flash and SRAM memory may be formatted, and each may act as a drive. The Flash may be made bootable, but that prevents any IDE drive from being C: To enable FlashROM to be used as a drive, go to the Advanced menu.

To the best of my knowledge, Flash or SRAM can't be added to the total memory.

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 floppies.

Main Setup  Please refer to Chapter 2, BIOS Configuration

Diskette can be internal EMC-FDM or external EXM -9 or -16.
EPC-26A / 27 supports 360K, 720K, 1.2 MB, and 2.88 MB.
   Note: The EMC-FDM has a 16MHz oscillator, and tops out with 1.44MB.

Main > IDE Adapter Submenu 

There appears to be issues with some levels of BIOS and drive size.

Main > Boot Sequence Submenu  

Main > Numlock (Keyboard Features) Submenu

Main > Advanced Menu

Integrated Peripherals Sub-Menu - Configures COM ports on EPC CPU module.
Memory Shadow Copy ROM into RAM
Large Disk Access Mode: > 528 MB, [DOS] - DOS, [Other] - other operating systems.
Built-in BIOS Extension Configuration Enables Flash memory to appear as a drive.

Main > Advanced > Integrated Peripherals Submenu

Configure COM ports on EPC CPU module.

Main > Advanced > Memory Shadow Submenu

Main > EXM Menu

Each EXM module has an ID, Option Byte 1 (OB1):/ Option Byte 2 (OB2)
Empty slots should show FF 00  00  indicating that no EXM is present
The ID / OB1 / OB2 information is in Chapter 2 of each EXM's documentation.

Note: The system does NOT populate these values! You must enter them manually...

Main > Exit Menu

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

Ardent Tool of Capitalism is maintained by Tomáš Slavotínek.
Last update: 08 May 2024 - Changelog | About | Legal & Contact