Monthly Archives: April 2018

The A20-Gate Fallout

A recent post explored the motivation (i.e. backwards compatibility) to implement the A20 gate in the IBM PC/AT. To recap, the problem IBM solved was the fact that 1MB address wrap-around was an inherent feature of the Intel 8086/8088 CPU, … Continue reading

Posted in IBM, Microsoft, PC architecture, PC history | 56 Comments

Any Readers in Central Italy?

This is a very long shot, but maybe someone can help me. I’d very much like to buy a piece of used electronics for sale in Italy (L’Aquila province). Unfortunately the seller requires a local pick-up. I don’t live exactly … Continue reading

Posted in Random Thoughts | 3 Comments