Ken Shirriff's blog

Computer history, restoring vintage computers, IC reverse engineering, and whatever

Showing posts with label reverse-engineering. Show all posts

Showing posts with label reverse-engineering. Show all posts

Fixing the core memory in a vintage IBM 1401 mainframe

I recently had the chance to help fix one of the vintage IBM 1401 computer systems at the Computer History Museum when its core memory sta...

Examining the core memory module inside a vintage IBM 1401 mainframe

The IBM 1401 mainframe computer was announced in 1959 and by the mid-1960s had become the best-selling computer , extremely popular with me...

Inside the Intel 1405: die photos of a shift register memory from 1970

In 1970, MOS memory chips were just becoming popular, but were still very expensive. Intel had released their first product the previous yea...

Down to the silicon: how the Z80's registers are implemented

The 8-bit Z80 microprocessor is famed for use in many early personal computers such the Osborne 1, TRS-80, and Sinclair ZX Spectrum. The Z80...

View web version

Powered by Blogger.