Fredrik Andersson has made a retro mechanical computer using roughly 100 telephone exchange circuit boards that have about fifteen 4 and 6 pole relays on each board. With a massive amount of time desoldering them using a hot-air gun he wound up with 1500 working relays. As it sits right now Mr. Andersson’s design-in-progress still has some bugs that need to be worked out but he says, “I have finished most of the ALU, as well as the 8-bit and 12-bit registers and pointer increment board and the control signals are generated by a PC, but of course the computer will be able to run autonomously when finished. Currently I'm working on the microsequencer and the memory interface.” As it stands right now Zusie’s features include: 8-bit data bus and 16-bit address bus. 3 x 8-bit accumulator registers and 2 x 16-bit general purpose registers. 64k solid state memory, holding heap, stack and program. 12-bit program counter and 12-bit stack pointer, ALU capable of not, and, or, xor, add, increment, decrement, shift, and indirectly, subtraction. Writable microprogram stored in solid-state device for sequencing. A pretty little assembly language with more instructions than such a little computer deserves. To see videos of Zusie in action visit: http://nablaman.com/relay/
Eavesdropper