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IBM 5100
The IBM 5100 Portable Computer is a portable computer introduced in September 1975, six years before the IBM PC. It was the evolution of a prototype called the SCAMP (Special Computer APL Machine Portable) that was developed at the IBM Palo Alto Scientific Center in 1973. In January 1978 IBM announced the IBM 5110, its larger cousin, and in February 1980 IBM announced the IBM 5120. The 5100 was withdrawn in March 1982.
When the IBM PC was introduced in 1981, it was originally designated as the IBM 5150, putting it in the "5100" series, though its architecture was not directly descended from the IBM 5100.
==Description==
The IBM 5100 is based on a 16-bit processor module called PALM (Put All Logic in Microcode). The IBM 5100 Maintenance Information Manual also referred to the PALM module as the ''controller''. The PALM could directly address 64 KiB of memory. Some configurations of the IBM 5100 had Executable ROS (ROM) and RAM memory totalling more than 64 KiB, so a simple bank switching scheme was used. The actual APL and BASIC interpreters were stored in a separate ''Language ROS'' address space which the PALM treats as a peripheral device. Prices ranged from $11,000 (16k model) to $20,000 (64k).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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