Check the listing for details. TEC-1G Z80 Single Board Computer PCB (BLUE!) + Power Switch + 8Bar LED. Condition: Brand New. Listed at 15.93 USD. This board is the Open Source Edition in BLUE!. (Current stock has the Errata Error #1 FIXED! No more cutting tracks required.) The TEC-1G is a direct descendant of the Talking Electronics Computer, known as the TEC-1, which was first published by the Australian electronics hobbyist magazine "Talking Electronics" between 1981 and 1991. www.talkingelectronics.com/te_interactive_index.html The TEC-1 was developed as a learning computer, designed to teach the basics of how a microprocessor works at the fundamental hardware and software level, and offered the ability to create and run simple programs in Z80 machine code. TE magazine covered the TEC-1 in six installments, known as "Issue 10" to "Issue 15". These magazines can be downloaded freely from the TEC-1 GitHub, located at: github.com/tec1group/TE-Magazines An active TEC community has (re)formed through Facebook (www.facebook.com/groups/tec1z80) with new hardware designs, enhanced versions and various expansion options being offered by various contributors within the community. The TEC-1G builds on both the TEC-1's base and recent history to modernize the overall design, address various design limitations and integrate many of the excellent add-ons into to a single PCB for the first time. The TEC-1G remains true to the original TE design goals: it is is built using only simple through-hole TTL logic chips so it is easily built and understood by the hobbyist. For the first time, the TEC-1G will also be fully open source, in both its hardware and software. The TEC-1G is the ultimate TEC-1! Each board will also ship with the difficult to obtain power switch and the 8Bar LED, free of charge, and the boards will be individually serialised / numbered. Full documentation including Assembly Guide can be found on GitHub: (www.github.com/MarkJelic/TEC-1G) NOTE: We have full kits available on the TINDIE store. Search for "TEC-1G"