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TS-7800 by Technologic Systems


  • Marvell MV88F5182 500 MHz single-core ARM9 CPU
  • 128 MB RAM
  • 512 MB onboard NAND flash
  • SD & MicroSD slots
  • 2 SATA ports
  • Real-time clock (battery is dead on devices that I have)
  • 5 V @ 2W
  • Optional 8-30V input circuit (TS-781)
  • Rated temperature -20…+70 °C

I used these devices quite a lot around year 2010.

They are very useful to have a Linux host wake up and sleep on battery power. That's because they contain an AVR that can control the power and sleep for a certain amount of time (ts7800ctl utility).

The 500 MHz CPU is not too fast, and 128 MB RAM is not too much, but it's a lot for many applications. I used an Easycap USB video converter to get analog video from a video camera. Another application was logging some serial data once a day, otherwise consuming microamps when “sleeping”.

I had done some kernel compiling for this platform for Yahoo! Group ts-7000, but the Yahoo! Groups discontinued their service, so the kernels may be hard to find from the internet.

I have also repaired one RTC to get an external coin cell battery for it.

This is how it looks like now:

While desoldering the RTC chip, I damaged the flash chip below and I had to reroute many traces with bare copper. Now, only SD card boot works and onboard flash was scrapped. That's OK. While opening up the RTC chip, I also damaged the quartz crystal, this was on one side of the RTC chip. On the other side, there is a capacitor (0.1 uF).

After adding the battery, the clock didn't start. The RTC registers showed that clock is stopped. I read the datasheet and I was guessing that had to put 0b010 (0x2) to OSC registers. This I did by modifying Linux driver rtc-m48t86.c temporarily. I'm looking at the file a few years later and I guess I did something like this:

ops->writebyte(0x20, M48T86_REG_A);
printk(KERN_INFO "rtc binary 0x20 set ");
ts-7800.txt · Last modified: 2024-04-26 04:12 by jaan

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