M20 Olivetti M20

Photos of Matteo's M20s

Matteo's Olivetti M20 DES

Matteo owns a nice Olivetti M20 DES with a black and white monitor. Unfortunately, recently the computer has begun to show problems while trying to boot. The M20 after being powered up emits a beep and shows a fuzzy screen. The system hangs and does not try to load the PCOS. Every suggestion is welcome.

The system trying to boot

The fuzzy screen

The M20 keyboard, with the BASIC keywords

A color M20 bought on an online auction

Matteo has bought a 4 color M20 system. These are the photos from the auction. M20s with a color monitor are rare, because they were very expensive at the time. The system has 160 KiB because it has a 32 KiB color memory expansion card. These cards had a sort of DMA which allowed to access the video memory while refreshing the screen.

Power Supply

Power Supply

Power Supply

Power Supply

Power Supply

Power Supply

Power Supply

Power Supply

Power Supply

Power Supply

Screen test




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