IFSP
Encyclopedia
IFSP radial parallel interface, was a parallel
interface
similar to Centronics
but incompatible, as it had different signal polarities and handshake protocol. Used in printers and computer
s manufactured in Comecon
.
All printer input signal lines were pulled up to +5V by 220 Ohm
resistor
, and pulled down to ground by 330 Ohm
resistor. This allowed usage of longer cables comparing to Centronics
, but overloaded most usual Centronics adapters.
Some devices allowed switching between IFSP and Centronics modes, i.e. Robotron
6319—6329 were manufactured with interchangeable interface modules, allowed usage of IFSP, IFSS and Centronics
.
Parallel port
A parallel port is a type of interface found on computers for connecting various peripherals. In computing, a parallel port is a parallel communication physical interface. It is also known as a printer port or Centronics port...
interface
Interface (computer science)
In the field of computer science, an interface is a tool and concept that refers to a point of interaction between components, and is applicable at the level of both hardware and software...
similar to Centronics
Centronics
Centronics Data Computer Corporation was a pioneering American manufacturer of computer printers, now remembered primarily for the parallel interface that bears its name.-The beginning:Centronics began as a division of Wang Laboratories...
but incompatible, as it had different signal polarities and handshake protocol. Used in printers and computer
Computer
A computer is a programmable machine designed to sequentially and automatically carry out a sequence of arithmetic or logical operations. The particular sequence of operations can be changed readily, allowing the computer to solve more than one kind of problem...
s manufactured in Comecon
Comecon
The Council for Mutual Economic Assistance , 1949–1991, was an economic organisation under hegemony of Soviet Union comprising the countries of the Eastern Bloc along with a number of communist states elsewhere in the world...
.
All printer input signal lines were pulled up to +5V by 220 Ohm
Ohm
The ohm is the SI unit of electrical resistance, named after German physicist Georg Simon Ohm.- Definition :The ohm is defined as a resistance between two points of a conductor when a constant potential difference of 1 volt, applied to these points, produces in the conductor a current of 1 ampere,...
resistor
Resistor
A linear resistor is a linear, passive two-terminal electrical component that implements electrical resistance as a circuit element.The current through a resistor is in direct proportion to the voltage across the resistor's terminals. Thus, the ratio of the voltage applied across a resistor's...
, and pulled down to ground by 330 Ohm
Ohm
The ohm is the SI unit of electrical resistance, named after German physicist Georg Simon Ohm.- Definition :The ohm is defined as a resistance between two points of a conductor when a constant potential difference of 1 volt, applied to these points, produces in the conductor a current of 1 ampere,...
resistor. This allowed usage of longer cables comparing to Centronics
Centronics
Centronics Data Computer Corporation was a pioneering American manufacturer of computer printers, now remembered primarily for the parallel interface that bears its name.-The beginning:Centronics began as a division of Wang Laboratories...
, but overloaded most usual Centronics adapters.
Some devices allowed switching between IFSP and Centronics modes, i.e. Robotron
Robotron
VEB Kombinat Robotron was the biggest East German electronics manufacturer. It was based in Dresden and employed 68,000 people . It produced personal computers, SM EVM minicomputers, the ESER mainframe computers, several computer peripherals as well as home computers, radios and television...
6319—6329 were manufactured with interchangeable interface modules, allowed usage of IFSP, IFSS and Centronics
Centronics
Centronics Data Computer Corporation was a pioneering American manufacturer of computer printers, now remembered primarily for the parallel interface that bears its name.-The beginning:Centronics began as a division of Wang Laboratories...
.
Signal description
| Centronics signal | IFSP signal | IFSP signal description |
|---|---|---|
| Strobe | SC | Transmitter control |
| Data 0 | D0 | Data signal |
| Data 1 | D1 | —"— |
| Data 2 | D2 | —"— |
| Data 3 | D3 | —"— |
| Data 4 | D4 | —"— |
| Data 5 | D5 | —"— |
| Data 6 | D6 | —"— |
| Data 7 | D7 | —"— |
| ACK | — | |
| Busy | AC | Receiver control |
| PE | A4 | Paper End |
| Sel | A0 | Receiver ready |
| Autofeed XT | — | |
| Error | A2 | Error |
| Init | — | |
| SLCT IN | S0 | Transmitter ready |
| GND | Z | Ground |