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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 US, HC-45 in Japan).
Epson, which is sometimes credited for being the first to market a notebook computer with the HX-20 in 1982, [2] introduced the ActionNote series in April 1993. [3] Development for the ActionNote was led by Sanford Weisman, portable computer product manager at Epson America, who was also instrumental in the design of the company's earlier NB series of laptops. [4]
The HX-20 (also known as the HC-20) is an early laptop released by Seiko Epson in July 1982. It was the first notebook-sized portable computer, [4] [5] occupying roughly the footprint of an A4 notebook while being lightweight enough to hold comfortably with one hand at 1.6 kilograms (3.5 lb) and small enough to fit inside an average briefcase.
Memory prices later decreased significantly, while rapid improvements in the performance of PCs and peripheral cables (most importantly, SCSI) enabled the development of low-end laser printers which offload rasterization to the sending PC. For such printers, the operating system's print spooler renders the raw bitmap of each page into the PC's ...