Module Comparisons Third-Party Products Functional Information

Ethernet Modules


There were only two Ethernet controllers made for Q-bus machines. The table below contains a comparison between them.

Module Number M7504 M7516 M7516-YM
Introduced 1984 1987 1989
Board Size Dual Dual Dual
Q-bus Address Size 22-bits 22-bits 22-bits
Media Ethernet Ethernet Ethernet
Link Speed 10 Mbps 10 Mbps 10 Mbps
AC Bus Load 4.3 3.3 3.3
DC Bus Load 0.5 0.5 0.5
+5V Load 3.5 A 2.7 A 2.7 A
+12V Load 0.5 A 0.5 A 0.5 A


The DEQNA is by far the most common module and works fine for most applications. However, it has a reputation for locking up under heavy loads.

The DELQA is the more desirable interface to own. It has a more powerful onboard processor, places less of a load on the power supply and addresses the lockup problems that the DEQNA had.

The DELQA-T interface, also referred to as the DELQA-PLUS and the DELQA-TURBO, is the most desirable interface to own. It provides a performance improvement over the standard DELQA, and it has a few more features and a simpler programming interface.


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