Computadoras en los Años 70

En la década de los 70 los ordenadores eran muy grandes y no tenían pantalla por lo que el resultado de los cálculos los daban por impresora. Lo mas habitual es que los programas se escribieran en tarjetas perforadas, en cada tarjeta perforada cabían 80 caracteres por lo que un programa podría necesitar cientos de tarjetas perforadas.

Disponían de varios módulos:
1- Módulo para perforar tarjetas.
2- Módulo lector de tarjetas perforadas.
3- Unidad central, con teclado para introducir comandos por consola y lector de disco.
4- Módulo de Impresora, por donde salen los resultados.

El procedimiento para hacer un programa era:
1- Se escribian las sentencias en una hoja de codificación.
2- Se pasaba el código a tarjetas perforadas.
3- Una vez escrito el programa se ponían las tarjetas en orden para que el ordenador las fuera leyendo.
4- Una vez acabada la ejecución del programa salían los resultados por la impresora.

Los programas que contenian funciones útiles para los cálculos se podían pasar a disco magnético. Los discos tenian 512KB de capacidad y median unos 45cm de diametro.
Los lenguajes que se utilizaban para programar estas tarjetas eran FORTRAN y COBOL o directamente en ensamblador.

Tarjeta perforada
Perforador de tarjetas
Unidad central IBM 1130
Módulo de Impresora

(Fotos en El Museo Nacional de las Computadoras, Inglaterra)

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