The Web Site to Remember National Semiconductor's Series 32000 Family


Lantronix is a company in the US. It was founded in 1989. They have build terminal servers based on Series 32000 processors. Surprisingly this company still exists and is doing business.


The Lantronix model ETS-8 is a terminal server with 8 terminal ports and an AUI Ethernet connector. It was one of the first products of the company. The price should be around 1700 US$. In my opinion this is quite high. But computer electronic was once expensive...

Fig. 1. The small case of the ETS-8 is 21 cm wide, 13 cm deep and has a height of 6 cm. One day I will find out what the meaning of ABCD is.

Fig. 2. All the logic fits on one board due to the high integration of the used devices.

The CPU of the ETS-8 is an NS32CG16 running at only 10 MHz. Obviously its performace is sufficient for this task. Main memory is 512 kByte of SRAM. There is an additional SRAM of 8 kByte which may have a battery backup. Two EPROMs store the software.

The Ethernet port is made of two National Semiconductor devices. The Signetics SCC2698 is an USART with 8 channels - ideal for a product of this kind. In the lower right corner of Figure 2 a Lantronix defined IC made by VLSI can be seen. The device is labeled TSGLUE which can be a hint for its purpose.

Below the logic board is a power board which transforms 220 V AC to the required DC voltages.

Fig. 3. The backside of ETS-8 with all the connectors. What is said to be the Ethernet Address on the left most label should be the MAC address.

The connection to the terminals is done via RJ45 connectors. This is new for me and I have never seen a terminal with such a connector. But it must be available in Europa because this ETS-8 was used at a University in Germany.


ETS-16 is the big brother of ETS-8. It connects up to 16 terminals to a server. The design is based on the same elements like the ETS-8. There is an interesting detail about the internal processor: this CPU is clocked at 15 MHz which is 50 % faster than in ETS-8. Obviously there is more to do for the CPU...

Fig. 4. The ETS-16 is nearly double as high as the ETS-8.

Fig. 5. The backside of ETS-16 has two rows of 8 connectors each.

Fig. 6. The additional PCB of ETS-16 is nearly empty.

Fig. 7. One power connector and two signal connectors are needed to connect the extension board with the basic board.

This chapter was last modified on 3 September 2020. Next chapter: Matrox