It was based on an Intel 8085 processor, 8-bit, clocked at 2 MHZ.It was equipped with a central 64K bite Ram, a keyboard with 58 alpha numeric keys and 11 numeric keys ( separate blocks ), a 32-character screen, a floppy disk : capacity = 140 000 characters, of a thermal printer : speed = 28 characters / second, an asynchronous channel, a synchronous channel, a 220V power supply.12 sockets (3 banks of 4) This indicates that there are 12 memory slots.
A "personal, portable information manipulator" was imagined by Alan Kay at Xerox PARC in 1968, The portable micro computer Portal of the French company R2E Micral CCMC officially appeared in September 1980 at the Sicob show in PARIS.
One notable example of a subnotebook is the Apple Mac Book Air.
The term "notebook" appears to have gained currency somewhat later as manufacturers started producing even smaller portable devices, further reducing their weight and size and incorporating a display roughly the size of A4 paper; these were marketed as notebooks to distinguish them from bulkier laptops.
So you must add memory four pieces at a time (and they must be the same size and type of memory) in order for the system to benefit from the upgrade.
The Sharp PC-5000, From 1983 onward, several new input techniques were developed and included in laptops, including the touchpad (Gavilan SC, 1983), the pointing stick (IBM Think Pad 700, 1992), and handwriting recognition (Linus Write-Top, 1987).