How does Adam Osborne's laptop work and function?

The Osborne 1 was not a laptop--it was portable, but it weighed 25 pounds. It had no internal battery, so you had to plug it in. The CPU was a Zilog Z-80, a very popular 8-bit microprocessor, running at 4 MHz.

The operating system was CP/M 2.2, the ancestor of MS-DOS.It has 64 kbytes of dynamic RAM, which was automatically refreshed by the CPU. Storage was two single-sided, single-density, 5¼-inch floppy disk drives. The display was a 5-inch monochrome CRT, capable of 52 characters × 24 lines.

Application software bundled with the machine included dBase II, WordStar, SuperCalc and MBASIC (a CP/M version of Microsoft BASIC, Microsoft's first product). The biggest drawback of the machine was the small amount of RAM.

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