IBM QMS 4525 manual Resident Fonts, Resolution, Right Key, Risc, RS-232C, RS-422

Resident Fonts

Resident Fonts

Fonts permanently stored in the printer's memory; also called internal fonts.

Resolution

A measurement of the dots-per-inch (dpi) in output material, either printed or displayed, as in a “high-resolution monitor.” Your printer features a 300 dpi resolution.

Right Key

This key moves the cursor one character position to the right.

RISC

Reduced Instruction Set Computing. A microprocessor design that focuses on rapid and efficient processing of a relatively small set of instructions.

ROM

Read Only Memory. ROM is a more stable kind of memory than RAM. Information stored in ROM is retained and can be retrieved each time the machine is activated.

RS-232C

A 25-pin hardware interface which allows the transfer of data in an asynchronous serial format. It has five user-defined parameters: baud rate, data bits, parity, stop bits, and protocol.

RS-422

A 9-pin hardware interface which allows the transfer of data in an asynchronous serial format. It has five user-defined parameters: baud rate, data bits, parity, stop bits, and protocol. The RS-422 interface uses paired signals to send and receive data. The value of the data depends on the difference in voltage between the paired signals rather than on an absolute voltage as in the RS-232C interface. By transferring paired signals, it greatly reduces the chances of interference from external sources during transmission since external interference is likely to affect both signals equally. This means that a system using RS-422 can have much longer data cables than a system using RS-232C, which limits the cable length to 50 feet (15m).

RTS

Request To Send. RTS is a signal sent from the host to the printer indicating

Glossary G-15

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