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"

9. Revised on Oct. 07, 2025

      Added video link "Casing of Homemade SAR ADC" to the project details.

10. Revised on Dec. 07, 2025

     Added the PDF version of this project detail and the schematic.