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


I bought in September 2016 an FPGA development board called Cyclone V GX Starter Kit from Terasic (see Figure 1). It costs 179 US$ and uses a 28-nm FPGA with six 3.125 Gbps transceiver channels from Altera. The board offers a 32-bit wide LPDDR2 DRAM memory with 512 Mbytes capacity. This device has a very high bandwidth for many applications. In addition the board has a HDMI output, an audio device, an SD card interface, many LEDs and switches and some expansion connectors.

The plan is to realize with this board a "multiple computer" system. The name TRIPUTER is an indication of how many systems will be integrated. The first one will be the PC532 running NetBSD. The second one will be the Ceres-3 using Oberon. Currently the last one will be the BBC computer with the 32016 Second Processor.

Using a commercial board for this purpose is the best choice. Nevertheless the board is not ideal. For example it lacks an Ethernet port and a real time clock. But it is cheap and the used FPGA is a modern one which will be available for many years. The missing features can be added through the expansion connectors. I will develop the necessary hardware for it too.

The three computers to be integrated are very different from a software point of view. Having them available in one system should be an exciting experience. The FPGA of the board is big enough to hold the required hardware.

Fig. 1. The initial configuration of the Cyclone V GX Starter Kit is presenting a photo of itself on the screen

Of course such a complex system is not build over night. But as time goes by the fourth milestone is now achieved :-)

Fig. 2. TRIPUTER V0.2 has calculated a Mandelbrot image. M32632 made it 20 times faster than NS32532/NS32381.

Fig. 3. The hardwired VT100 terminal of TRIPUTER V0.3 shows the boot process of NetBSD.

Milestone 4 : TRIPUTER V0.3 is available => updated to V0.33 again due to some issues in the VT100 terminal emulation.

Description: version 0.33 of TRIPUTER contains the PC632M system running NetBSD with an SD card. Still this system uses the USB connection for the RS232 interface. The image for the SD card is available at Software/NetBSD. The V0.33 zip archive contains the following files:

The date of the zip-file is 11 May 2019.

Status: done.

October 2019 : the PERI board is available!

The PERI board is an IO board which brings to the FPGA board some necessary extensions: a true RS232 interface, a real time clock (RTC), two PS2 ports for mouse and keyboard, a second SD card connector and a 100 Mbit Ethernet interface. All of these things are now operational. One port is not yet usable: SATA. The hardware is there, but the verilog code for this challenging interface must still be written.

Figure 4 shows the PERI board in action.

Fig. 4. The PERI board with the serial number 1 is attached to the Cyclone V GX Starter Kit. 2 of the 3 LEDs of the Ethernet interface are active.

The purpose of PERI is to transform the Starter Kit into a standalone computer. Then all the planned systems can be implemented.

To test the functions of the PERI board I have made a new version of TRIPUTER: it is V0.9 . The V0.9 zip archive contains only three files:

The system can only test PERI if the flash is being configured with the pof file. Then some software is available. I hope that V0.9 will be replaced soon with a version which enables SATA...

Milestone 5 : August 2020 - TRIPUTER V1.0 is available.

Description: TRIPUTER V1.0 emulates a PC532 equipped with 256 Mbytes of main memory. The original never had such a huge memory. Therefore the former developers were surprised that their system can support this size. Two drive images containing different versions of NetBSD are available: 1.5.3 and 4.99 . It should be the first time that a PC532 boots from a SATA device. In my case it is an SSD.

The PC532 uses a Cabletron EA412 Ethernet adapter connected to the SCSI bus. The EA412 was mainly used in Apple computers. The developers of the PC532 reused it because the PC532 is a SCSI based system. The disadvantage of the EA412 is the lack of an interrupt signal which becomes active if new frames are received. The software has to poll the device and this limits the speed of the interface. I have emulated the basic functionality of EA412 and got a download speed of 200 kbytes/s and an upload speed of 350 kbytes/s with ftp.

Fig. 5. Two PuTTY terminals connected to TRIPUTER V1.0 running NetBSD.

The screen dump in Figure 5 shows two PuTTY windows. The left one is connected to a serial port via USB and runs a root process. The right one is connected via Ethernet and runs telnet for a user.

The performance of TRIPUTER is quite high. A new version of NetBSD is compiled in one hour, three times faster than the original.

Status: done.

December 2020 : TRIPUTER V1.1 is available.

TRIPUTER V1.1 fixes two bugs in the Ethernet unit for NetBSD, adds a second disk drive for NetBSD and includes a statistic unit. The V1.1 zip archive contains seven files:

It is possible to generate a new pof file with the files in the zip archive. If you want to do this please sent an email to for further information.

Milestone 6 : TRIPUTER V2.0 is available.

Description: TRIPUTER V2.0 will contain the Ceres-3 and the PC532.

Status: to be done.

This chapter was last modified on 13 December 2020. Next chapter: TITAN6