At that moment in time, the "Hobby" computer was cut of the edge technology:

- compatible with both of the major Z80 operating systems of the time: CP/M and ZX Spectrum

- single (256 x 192) and double (512 x 192) screen resolution

- hardware switchable Z80 clock 3.5 MHz (standard) or 7 MHz (double)

- software memory pagination: Z80 can address maximum 64 KB of memory, but this system had a total of 114 KB (64 + 16 KB of RAM and 32 + 2 KB of EPROM)

- first overclock that i knew so far (at that moment the maximum clock frequency for a Z80 microprocessor was 6 MHz, mine was working at 7 MHz)

- first "overburn" on floppy disks that i knew so far (similar with CD overburn but on floppy disks): the standard file system had normally 80 tracks on a floppy, mine had up to 85 tracks.

A BIG "THANK YOU" TO ALL THE PEOPLE WHO HELPED ME TO DESIGN AND IMPLEMENT THE XOR HOBBY COMPUTER PROTOTYPE

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Full of dust

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The power source

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Under the hood

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"Motherboard" detail

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Soldered wire wrapping

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Programming in BASIC

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Still functional after so many years

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CP/M floppy disks still readable

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Normal ZX Spectrum resolution, 256x192

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Double resolution, 512x192, useful for CP/M OS

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On the right, a development board (like an ancient Arduino shield :)

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Filmed in HDTV with Nikon D90 and 18-105mm f/3.5-5.6G ED AF-S VR DX Nikkor Zoom Lens on 18'th of February 2009

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