Very little information about this HX-52 which was probably an extended version of the HX-51, but we don't know the technical differences between the two versions.
It was a standard MSX 1 machine which held a particular IC, also designed by Toshiba, and called T7937. Inside this unique chip one found a Z80 compatible CPU, a TMS-9918A Video Display Processor, and an AY-3-8910A sound generator. The HX-52 also offered three video outputs - RGB scart socket, TV aerial and composite video jacks.
Obviously, this computer was sold in very small quantities.
Thanks to E.Calogiuri for the pictures.
BUILT IN LANGUAGE
Microsoft Extended Basic (MSX Basic V1.0)
Full-stroke 73-key with 5 function keys and arrow keys
Toshiba T7937 (Z80 CPU + TMS-9918A + AY-3-8910A)
part of the T7937 chip
32 KB BASIC/BIOS ( MSX BASIC V1.0)
Mode 0 : 40 x 24 - Mode 1 : 32 x 24
Up to 256 x 192 pixels
4 channels, 8 octaves + white noise
SIZE / WEIGHT
2 joystick, 2 cardridge slots, Tape-recorder, RGB (Scart socket), TV aerial, Composite video, Parallel printer, Serial RS232