Difference between revisions of "EDSAC"
From Computer History Wiki
(add order code table) |
|||
| Line 13: | Line 13: | ||
| H n || Copy the number in storagae location n into the multiplier register | | H n || Copy the number in storagae location n into the multiplier register | ||
|- | |- | ||
| − | | V n || Multiply the number | + | | V n || Multiply the number in storage location n by the number in the multiplier |
| + | | || register and add the product into the accumulator | ||
|- | |- | ||
| − | | *Z || | + | | 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 | ||
|- | |- | ||
|} | |} | ||
Revision as of 21:28, 18 May 2007
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.
