Memory. How much memory, or information storage capacity, do you need? The computer's memory is measured in kilobytes (abbreviated K), and most computers come in sizes ranging from 2K up to 256K. (A kilobyte is equal to roughly 1,000 characters.) You need to know the software program you will use and your recordkeeping requirements to accurately estimate the capacity of the equipment you need.
Some agricultural programs use 48K or 64K of memory. User friendly programs, which require little training to use and which guide you through the program, may be easier; but they may require more memory for the program itself, leaving you less storage space or memory for the data.
Computation. What kind of computational ability do you want your computer to have? Will it serve the computing needs you have identified for now and later?
Input and Output Devices. What kind of output do you need? What additional pieces of equipment or peripherals (such as separate screen, disk drive, modem, printer) will you need to buy to make this system do what you want it to?
Most agricultural programs require a printer. A dot matrix printer (which produces characters made of small dots) may be sufficient. Another option is a letter quality printer, which is more expensive.
How big a screen do you need? (Screens are measured in characters and in inches.) Do you need an 80-column or 40-column monitor? Do you need color and strong graphics capability? What quality screen image do you need?
Can you add memory and other components later if you need to?
External Storage. What kind of external storage does the system use, floppy disk, hard disk, or tape? Cassette tape storage costs less, but compared to disk storage, it has several disadvantages.
If the hardware uses floppy disks, is the disk drive included as part of the computer package or does it come separately? Is a second disk drive included in the package or does it come separately? What kind of a disk drive(s) do you need, single or double density? Hard or floppy?