EDSAC

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
*Z	Multiply the number

*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.