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CARDIAC (CARDboard Illustrative Aid to Computation) was a learning aid developed by David Hagelbarger and Saul Fingerman for Bell Telephone Laboratories in 1968 to teach high school students how computers work. The kit consisted of an instruction manual and a die-cut cardboard "computer". The computer "operated" by means of pencil and sliding cards. Any arithmetic was done in the head of the person operating the computer. The computer operated in base 10 and had 100 memory cells which could hold signed numbers from 0 to ±999. It had an instruction set of 10 instructions which allowed CARDIAC to add, subtract, test, shift, input, output and jump. ==Hardware== The “CPU” of the computer consisted of 4 slides that moved various numbers and arrows to have the flow of the real CPU (the user's brain) move the right way. They had one flag (+/-), affected by the result in the accumulator. Memory consisted of the other half of the cardboard cutout. There were 100 cells. Cell 0 was “ROM”, always containing a numeric "1"; cells 1 to 98 were “RAM”; available for instructions and data; and cell 99 could best be described as “EEPROM”. Memory cells held signed decimal numbers from 0 to ±999 and were written with a pencil. Cells were erased with an eraser. A “bug” was provided to act as a program counter, and was placed in a hole beside the current memory cell. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「CARDboard Illustrative Aid to Computation」の詳細全文を読む スポンサード リンク
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