Ethernet Modules
Overview
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 |
|---|---|---|---|
| Model Number | DEQNA | DELQA | DELQA-T |
| Introduced | 1984 | 1987 | 1989 |
| Discontinued | |||
| 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 |
Summary
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.
References
- DEQNA Ethernet User's Guide, 2nd Edition, September 1986 (EK-DEQNA-UG-002)
- DELQA User's Guide, 2nd Edition, 1988 (EK-DELQA-UG-002)
- DELQA-PLUS Addendum to DELQA User's Guide, September 1989 (EK-DELQP-UG-001)
Additional Resources
- MicroNote 5 - Q22 Compatible Options
