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Z80 device
This image shows the device having a QWERTZ keyboard and a 7-segment display. Alphanumerics had been on the display by (mis-)using the 7 segments. The housing is 2mm aluminium.
Opening the device reveals three layers of circuit boards. One holds the keyboard and interfaces to the display. The middle one carries a 1MHz quartz chrystal and a reat time clock circuit. Some ICs are missing - most notably a Z80PIO for controlling the display and keyboard.
The lower layer carries a Z80CPU and was capable to hold 16kByte of EPROM and 48kByte of RAM (8kByte each chip). The battery was comprised of 4 NiCd AAA cells. Here, a serial data interface incl. pins for charging the battery was connected to the front-side.
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