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The datasheet of this flash module lists that Pin 16 should not be connected (N.C.), but the board being examined has a connection on this pin.

According to Texas Instruments, this calculator was designed to use a Zilog Z80 MCU operating at 6 MHz, but upon inspection, I find that the device was actually using a custom ASIC marked ‘INVENTEC 6SI837 0A JAPAN 0209EAI’.

Retro-Electro is a long-form article series for Digikey’s magazine ‘We Get Technical.’ (opens in new tab) Each of these will have stories you’ve never heard before. How the Battery Enabled the Victorian Age (opens in new tab) The Victorian Age may not have happened without Volta’s Battery. Volta’s battery may not have taken off without…

Last weekend, I delved deeper into my restoration project of the Allen B Du Mont 224-A Oscilloscope, with the goal of finally getting it open, checking it for safety, and powering it on. The journey was filled with challenges, but ultimately, it was a successful one.

Have you ever struggled to find the right cable for your game console? What if you could solve this problem permanently?

Recently, I had the opportunity to acquire a Du Mont 224-A Oscilloscope and I decided to take on the project of restoring it to its former glory. This blog series will document my journey of restoring this vintage instrument and will provide a glimpse into the history of electronic measurement.