The SX-100 is a MSX 1 computer with a minimal but beautiful case design. Contrary to most of other MSX computers, the single cartridge slot can be found on the right side of the unit.
The SX-100 uses a Z80A compatible CPU from Sharp (LH0080A) and a Yamaha YM2220 VDP (Video Display Processor) compatible with the Texas Instruments TMS9918. This YM2220 as only used in the Sakhr AX-150, Victor HC-30 and Yamaha SX-100 MSX computers.
The sound is handled by a Yamaha S3527 MSX-Engine, also called called MSX-SYSTEM made by Yamaha for ASCII & Microsoft. It integrates several features including a Yamaha YM2149 PSG-sound chip, compatible with a the more common General Instrument AY-3-8910 (for sound, joystick ports, etc).
Yamaha also produced a slot expander for this computer, called the SX-101 Expansion box designed to be placed underneath the monitor. It allows to use two standard MSX cartridge slots and includes a special Yamaha Module Slot Connector, for use with for instance the SFG module.
It was sold only in Japan and thus features a Japanese keyboard.
The SX-100 was sold in black (SX-100 DB), white or dark blue.
It was also sold in Japan rebranded as the Victor HC-30 in black or red.
Thanks to msx.org for most of the info.
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