Electronic computer, cords and related papers, KUKAC 1, metal / plastic / paper / Bakelite, designed and made by Allan Bromley, Australia, c. 1970
This is a digital computer, using a 16-bit word size. This size was adopted, because it was simple and economic and well supported by current MSI components. The computer has three functional components: a scratch pad, an arithmetic logic unit, and an input-output bus and memory.
The scratch pad consists of twelve general-purpose and four special-purpose shift registers. The logic unit performs operations on the contents of selected scratch pad registers. All arithmetic is performed using standard 2-complement logic, bit-serial techniques. The main memory is 512 words, which may be expanded in increments of 256 words. It is assembled from MOS LSI shift registers, giving an effective memory cost of around 1 cent per bit.
Standard modules are used, and wiring is point-to-point. A number of integrated circuits (ICs) were installed on homemade circuit boards. A cassette recorder is used for storage back-up. The equipment included a digital to analogue converter to drive the display. Paper tape reader and punch were also required, as a number of instructions were stored on punch cards. Professor Bromley suggested that a modified television set could be used as a simple output device and to display the operation of the computer. He suggested that a cassette recorder could be used to back-up the store, a cheap electric typewriter could provide hard copy output, and a calculator for keyboard and display.
The computer is housed in a box with metal finish, side, bottom and top in a 19 inch rack. Switches, instructions on punch cards at the front. There are 14 cards with integrated circuits.
Box of papers relating to KUKAC 1.