hexadecimal display

When working with microprocessors hexadecimal notation is frequently used to enter and read out data. Hexadecimal digits can be decoded and displayed in a number of ways. The first method is to use a commercial HEX display with built- in decoder, such as the Hewlett- Packard 5082-7340. However, these devices are fairly expensive. The second approach is to programme a display routine into the micro- processor. However, this must be stored in a ROM and occupies approximately 200 ~ytes of memory, depending on the microprocessor type.