IBM 5110 User Manual page 8

The clerk receives a copy of the customer orders after orders are
shipped. He uses these documents to prepare bills that he sends to
customers. To prepare the bill, he follows this procedure:
1. Look up, in a price catalog, the price of each item on the order.
2. Multiply the price by the quantity shipped.
3. Add the total price of items to get the total amount of bill.
4. Check the customer records to see if any special discounts apply,
and adjust the bills accordingly.
5. Type the bill.
6. Adjust the accounts-receivable records to show what the
customer owes.
7. Update the inventory records to show the reduced stock.
For each billing, the
cle~k
follows the same procedure. In computer
terms, this procedure is his program for doing the job. The customer
order is his input, the calculating and file updating he does is
processing, and the results of the processing (the billing and updated
records) are his output.
The 5110 can speed up the billing operation and reduce costly errors.
The order information can be entered from the keyboard; the records
(such as price lists, customer records, accounts receivable records,
and inventory files) can be quickly referenced and updated (processed)
using tape or diskette storage; and the printer can print the billings.
The parts of the 5110 used for data processing are:
Input
• The keyboard from which data is entered into the system.
• Tape or diskette storage from which data can be read for
processing.
Processing
• The 5110 internal storage, which includes the active workspace. The
active workspace is where calculations are performed and where
user-defined functions (programs) and variables are stored.
Data Processing Concepts 3