Internals of the Davide Bucci's M20The machine is a BC model, with two floppies, 128kB of RAM and a B/W monitor.
A view of the motherboard with the disk drives and the keyboard removed. On the left, we can see the Zilog Z8001 processor. On the center, the 128kB of RAM organized as 16x64kbit NEC 6164 DRAM chips. On the right, the expansion connectors.
The keyboard and the disk drive protection. The keyboard is controlled by a stand-alone microcontroller which communicates with the motherboard with a serial communication. On the keyboard there is a small buzzer wich was useful to indicate various operating conditions. The keyboard layout shown is the longago forgotten standard typewriter Italian layout.
The power supply taken apart. Note the two filter capacitors on the left side of the board. They can be charged up to 400V and can stock a dangerous voltage for quite a while after the mains is disconnected. Be careful!
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