woon yew thong S-100 personal computer Z80

Around Apple 2 personal computer era

1979 – On my final year at Singapore Polytechnic, I decided to build my own computer system.
Based on S-100 architecture and using a popular CPU at that time – Z80.

woon yew thong S-100 personal computer Z80

woon yew thong S-100 personal computer Z80

woon yew thong S-100 personal computer Z80

woon yew thong S-100 personal computer Z80

woon yew thong S-100 personal computer Z80

woon yew thong S-100 personal computer Z80

woon yew thong S-100 personal computer Z80

woon yew thong S-100 personal computer Z80

woon yew thong S-100 personal computer Z80

woon yew thong S-100 personal computer Z80

woon yew thong S-100 personal computer Z80

woon yew thong S-100 personal computer Z80
Data input via mechanical ON – OFF switch and powered by a 10 ampere A.C. Transformer.

woon yew thong S-100 personal computer Z80
1979 – Building my own personal computer