1. The article was first posted on Sep. 23, 2021

2. Revised on Oct. 18, 2021

      Added photos IMAGE_055 and IMAGE_043 of my own 8-bit digital sampling unit for analog oscilloscopes in 1979. 

3. Revised on Apr. 16, 2022

      Added schematics WaveMemory_1979.pdf of my own 8-bit digital sampling unit for analog oscilloscopes in 1979 to attachments.

4. Revised on Aug. 26, 2022

      Added video link "SAR AD conversion and voltage display with a home-made 6502 computer" to the project details.

5. Revised on Apr. 19, 2023

      A note on bypass capacitors has been added to Fig. 2.

6. Revised on Mar. 31, 2024

      Replaced the photos of my own 8-bit digital sampling unit in 1979 with better quality ones.

      Added photo of my own 8-bit SAR ADC board in 1979 to the appendix chapter.

7. Revised on Jun. 18, 2024

      Added photos of a memory board and a control board of my own 8-bit digital sampling unit in 1979 to the appendix chapter.

8. Revised on Jun. 29, 2024

      Added project link of the "Homebrew Digital Sampler in 1979"