Fake in China (EPROMs)

 When I opened the HP 8903B Audio Analyzer I realized, that the rom memory on the processor board is assembled from various chips from various providers, what I not really like. The EPROMs anyway need reprogramming after a few decades, to keep the instrument working in stability.

As I didn't want to erase the originals, I had the plan to create a complete new EPROM set. The 2716 and 2516 EPROMs are not available anymore from any of the regular suppliers. So I went to the eBay to find some. Ordered 20pcs. Arrived from China:

I know, that the manufacturers time to time change the process of the devices kept on the market. But come one! Three different chip size, with the same date code?

Guys, you can do better job than this! :-D

Anyway, I tried. One out of the twenty acted like an EPROM in the programmer, even this one was failing during the programming cycle.

Secret Project 2.

Two of the boards made during this week is part of my second secret project.
It is based on ESP8266:

As you see I choose the ESP-07 for this, what I've in my parts bin.
I tried to wake up the processor board:

First I loaded the standard Arduino flash test example into it. It was "working", but...
...the result is a massive failure for me:

I bought the ESP-07 modules at the beginning of the ESP8266 era, to play with it. I not even checked the flash size at that time. It has 512K (same as the ESP-01). I changed the flash on the ESP-01, but this has a metal can. Therefore it not worth the effort to change the flash.
Fortunately I've a few ESP-12Es also. So, jumped to my workshop:

Much better:

And ordered a few ESP-07S and ESP-12F.