Your question about Siemens S30810-Q2260-X DM4L

The card DM4L (Data Processor Mono 486 with LAN) covers the same functionality as the card DM3L but brings higher performance to the systems 310E and 350E.

Although being software compatible there are slight differences in the non-volatile memory and the card's internal initialization which can be handled during system boot.

The differences include the following:

• The EPROM (ROM) address space has been reduced to 128 kB.
• The state of the V.24 control registers for channels 2 and 3 as well as the state of the 486/DSP-setting can be read.
• The number of wait states for DSP accesses to the V.24 controllers has been increased to 6.
• A power on signal is generated whenever the 5V power supply fails as well as the 5V-to-3V-DC/DC converter fails.
• Memory capacity can not be derived from the HW ID. In addition, the memory controller has not to be programmed. Memory itself is implemented as exchangeable DIMMs.
• There is decode logic that has to be configured before the card will operate correctly.
• The LAN controller must be configured to support the new DRAM architecture.
• The number of waitstates for CPU accesses is fixed.