Browse Prior Art Database

Parallel Interface Performance Analyzer

IP.com Disclosure Number: IPCOM000060923D
Original Publication Date: 1986-Jun-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 69K

Publishing Venue

IBM

Related People

Ono, T: AUTHOR [+2]

Abstract

This performance analyzer for a controller or a printer having a Centronics interface can automatically measure and display a host controller waiting time, a printer waiting time and a total time for transmitting data between the host and the printer by manually setting a transmitting data length therein. As shown in Fig. 1, this analyzer comprises a Parallel Interface Performance Analyzer (PPA) card and a utility program installed in a IBM 5550 system. The analyzer is connected between the host controller and the printer to be analyzed. The PPA card has three Programmable Interval Timers (PITs). One of the PITs counts strobe (STB) signal pulses on a parallel interface until its content equals a byte number manually set by the 5550 keyboard.

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Parallel Interface Performance Analyzer

This performance analyzer for a controller or a printer having a Centronics interface can automatically measure and display a host controller waiting time, a printer waiting time and a total time for transmitting data between the host and the printer by manually setting a transmitting data length therein. As shown in Fig. 1, this analyzer comprises a Parallel Interface Performance Analyzer (PPA) card and a utility program installed in a IBM 5550 system. The analyzer is connected between the host controller and the printer to be analyzed. The PPA card has three Programmable Interval Timers (PITs). One of the PITs counts strobe (STB) signal pulses on a parallel interface until its content equals a byte number manually set by the 5550 keyboard. At that time the other PITs measure a total waiting time, a total printer waiting time and a total host waiting time by counting sampling pulses at 125 ns intervals during STB signal pulses and/or BUSY signal pulses being on. The printer waiting time and the host waiting time for a single transmitting data byte are defined in Fig. 2. A measuring sample is shown in Fig. 3. Measuring is started when the first data is transmitted and ended when the count of the data to be transmitted is completed or when an escapement (ESC) key is depressed. In order to measure the maximum capacity of a host to be measured or that of a printer to be measured, an ideal printer or an ideal host may be simula...