The Beginning of Tester Board Assembly

Went to SS2 PJ to buy 2.2k ohm resistors and casing LED to complete the tester board assmebly.
Mr Yu TT assemble the DC motor trial PCB driller for Mr Khow. Next Mr Khow project is to design the mechanical holder for that driller.

8255 Terminal Board
This is how this board looks like. Mr Khow completed the 8255 terminal board connector tracing. Now it's my job to double check that it is correct. I'm lucky since the notes that I prepared 3 years ago that being kept by Mr Yu comprise this board connection. It saves my precious time indeed. Here is the board layout diagram. To download this layout diagram, click here.














8255 Tester I/O Board
Give the design schematic diagram to Mr Khow to assemble. Assemble one input circuit components for reference and let him complete the other 4 as well as DC 5V and 12V input to the tester board. He managed to complete it by end of the day and now I have to double check it to ensure everything is allright. This is how it looks like.

USB User Port Tester Board
Drill a hole for 40P IDC Female connector at USB black box. It will takes some time to finish due to job priority now is for 8255 refurbishment as well as upgrading Mr How knowledge about PC interfacing.

Get the photocopy of the old 8255 journal from Mr Yu files. Make 2 copies for myself and Mr Khow. The objective is to help Mr Khow understand the C programming and Assembly Language faster. Another problem that I face today is suddenly the old P3 8255 desktop PC no display come out.