Can a budget handheld oscilloscope bought off AliExpress for just €26 act as a viable tool on a retro computer repair bench? That is the question Tommy Ovesen from Arctic retro set out to answer in his latest video. Eager to see if the pocket-sized device could handle standard diagnostic tasks, Tommy put the FNIRSI DSO152 mini digital oscilloscope through its paces on the clock lines of a Commodore VIC-20 and a Commodore 64.
The DSO152 is widely advertised on budget retail platforms with a 10 MHz analog bandwidth and a 50 MS/s sampling rate, which sounds like plenty for investigating 8-bit computers. However, as is often the case with ultra-cheap electronics, the marketing does not tell the whole story. Tommy’s testing across different frequencies revealed significant limitations, particularly when dealing with the high-frequency clock signals common in retro hardware.
To make matters more frustrating, Tommy discovered after filming that the seller had buried the true, much lower capabilities of his specific model deep within one of the additional promotional images—details that were missing from the main listing. Fortunately, after filing for a refund, the seller agreed to a partial refund while letting him keep the device. Despite the misleading listing, the portable scope can still find a niche for low-frequency hobbyist work, but it is far from a magic bullet for serious retro repair diagnostics.
If you are diagnosing clock lines on your own builds or vintage machines, budget gear like this might look tempting. However, for debugging communications lines, a highly targeted tool like Anders Nielsen’s custom multi-protocol debug dongle (which we covered in his video on debug tooling) or a dedicated programmer like the Relatively Universal ROM Programmer from the iMania shop can offer far more specialized insight than a budget scope can manage.
Check out the full teardown, signal generator tests, and VIC-20 clock analysis in Arctic retro’s original video below:
Testing a cheap 26 EUR FNIRSI DSO152 mini digital oscilloscope on YouTube
