EDSAC

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Conceived in 1946 and the machine did its first calculation in the summer of 1949

Order Codes

Order Description
A n Add the number in storage location n into the accumulator
S n Subtract the number in storage location n from the accumulator
H n Copy the number in storagae location n into the multiplier register
V n Multiply the number in storage location n by the number in the multiplier register and add the product into the accumulator
N n Multiply the number in storage location n by the number in the multiplier register and subtract the product into the accumulator
T Transfer the contents of the accumulator to storage location n and clear the accumulator
*Z Stop the machine
*The addresses in these order codes need not be zero.
** The addresses in these orders may be k.p-2 where k is odd, provided that the addresses do not exceed 2047.