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The Epson PX-4 (HC-40 or HX-40) is a portable CP/M based computer introduced in 1985. The screen was 40×8 characters physical, but 80×25 or 40×50 virtual, making it almost compatible with the Epson PX-8 Geneva. It could be operated from a Nickel-Cadium battery pack (Epson RB 105), 4xAA batteries, or a 6V 600mA DC power supply. It was targeted as successor of the Epson HX-20 portable, which was very popular with field engineers. The PX-4+ was an improved version which had the External RAM disk integrated (HX-45 in the USA, HC-45 in Japan).

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  • Epson PX-4 (en)
  • Epson PX-4 (es)
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  • The Epson PX-4 (HC-40 or HX-40) is a portable CP/M based computer introduced in 1985. The screen was 40×8 characters physical, but 80×25 or 40×50 virtual, making it almost compatible with the Epson PX-8 Geneva. It could be operated from a Nickel-Cadium battery pack (Epson RB 105), 4xAA batteries, or a 6V 600mA DC power supply. It was targeted as successor of the Epson HX-20 portable, which was very popular with field engineers. The PX-4+ was an improved version which had the External RAM disk integrated (HX-45 in the USA, HC-45 in Japan). (en)
  • El Epson PX-4 (HC-40 o HX-40) fue un ordenador portátil compatible CP/M presentada en 1985. La pantalla tenía 40 × 8 caracteres físicos, pero 80 × 25 o 40 × 50 virtuales ​, por lo que es casi compatible con la Epson PX-8 Geneva. Puede funcionar con un paquete de baterías de níquel-cadmio (Epson RB 105), 4 baterías AA o una fuente de alimentación de CC de 6 V y 600 mA. Fue elegido como sucesor del portátil Epson HX-20, ​ que era muy popular entre los ingenieros de campo. El PX-4+ era una versión mejorada que tenía integrado el disco RAM externo. (es)
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  • Epson PX-4 (en)
name
  • Epson PX-4 (en)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/Epson_PX-4_(HC-40,_HX-40)_(1985)_(24493874268).jpg
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storage
  • Optional Microcassette cartridge (en)
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cpu
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aka
  • HC-40 (en)
  • HC-41 (en)
  • HX-40 (en)
  • HX-41 (en)
  • PX4-B (en)
caption
  • The Epson PX-4 (en)
manufacturer
power
  • Rechargeable nickel-cadmium battery pack , 4xAA batteries, or a 6V 600mA DC power supply (en)
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  • El Epson PX-4 (HC-40 o HX-40) fue un ordenador portátil compatible CP/M presentada en 1985. La pantalla tenía 40 × 8 caracteres físicos, pero 80 × 25 o 40 × 50 virtuales ​, por lo que es casi compatible con la Epson PX-8 Geneva. Puede funcionar con un paquete de baterías de níquel-cadmio (Epson RB 105), 4 baterías AA o una fuente de alimentación de CC de 6 V y 600 mA. Fue elegido como sucesor del portátil Epson HX-20, ​ que era muy popular entre los ingenieros de campo. Otra característica del PX-4 era su alta modularidad. Heredando las cápsulas ROM de la Epson PX-8 Geneva, añadió una bahía de cartuchos (similar pero incompatible con la Epson HX-20), para la que Epson ofreció varias impresoras, unidad de microcasete, módem, grabadora de EPROM, DMM (Digital Multímetro Módulo), cartuchos de RAM y ROM. Los terceros pueden fabricar cartuchos personalizados. El módem, el GRABADOR de EPROM y el DMM necesitaban programas de usuario. El sistema permitía extensiones de BIOS (User BIOS). Otras características fueron el puerto Serial y el RS-232C, la interfaz del lector de código de barras como con la Epson PX-8 Geneva. Los nuevos fueron un puerto de casete y un puerto de impresora paralelo. El teclado también era fácilmente reemplazable, lo que permitía diseños específicos de países pero también diseños personalizados, como el "teclado de elementos" que convierte el PX-4 en una caja registradora. Esta tendencia se amplió con la para la que incluso estaban disponibles "teclados de elementos" con pantallas táctiles. La memoria RAM interna era de 64 KiB, de los cuales una parte podía reservarse como disco RAM. Se puede conectar un disco RAM externo, creando un disco RAM de 120K, dejando la RAM interna como BIOS de usuario y espacio de trabajo. El PX-4+ era una versión mejorada que tenía integrado el disco RAM externo. (es)
  • The Epson PX-4 (HC-40 or HX-40) is a portable CP/M based computer introduced in 1985. The screen was 40×8 characters physical, but 80×25 or 40×50 virtual, making it almost compatible with the Epson PX-8 Geneva. It could be operated from a Nickel-Cadium battery pack (Epson RB 105), 4xAA batteries, or a 6V 600mA DC power supply. It was targeted as successor of the Epson HX-20 portable, which was very popular with field engineers. Another feature of the PX-4 was its high modularity. Inheriting the ROM capsules from the Epson PX-8 Geneva, it added a cartridge bay (similar but incompatible with the Epson HX-20), for which Epson offered several printers, micro-cassette drive, modem, EPROM writer, DMM (Digital Multimeter Module), RAM and ROM cartridges. Third parties could make custom cartridges. The modem, EPROM writer and DMM needed user programs. The system allowed for BIOS extensions (User BIOS). Other features were the Serial and RS232 port, barcode reader interface like with the Epson PX-8 Geneva. New were a cassette port and parallel printer port. The keyboard was also easily replaceable, allowing country specific layouts but also custom layouts, like the 'item keyboard' turning the PX-4 into a cash register. This trend was taken further by the for which even 'item keyboards' with touch screens were available. Internal RAM was 64K, of which a part could be reserved as RAM disk. An External RAM disk could be attached, creating a 120K RAM disk, leaving internal RAM as user BIOS and workspace. The PX-4+ was an improved version which had the External RAM disk integrated (HX-45 in the USA, HC-45 in Japan). (en)
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