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.
NAME
HX-52
MANUFACTURER
Toshiba
TYPE
Home Computer
ORIGIN
Japan
YEAR
1985
BUILT IN LANGUAGE
Microsoft Extended Basic (MSX Basic V1.0)
KEYBOARD
Full-stroke 73-key with 5 function keys and arrow keys
CPU
Toshiba T7937 (Z80 CPU + TMS-9918A + AY-3-8910A)
SPEED
3.58 MHz
CO-PROCESSOR
part of the T7937 chip
RAM
64 KB
VRAM
16 KB
ROM
32 KB BASIC/BIOS ( MSX BASIC V1.0)
TEXT MODES
Mode 0 : 40 x 24 - Mode 1 : 32 x 24
GRAPHIC MODES
Up to 256 x 192 pixels
COLORS
16
SOUND
4 channels, 8 octaves + white noise
SIZE / WEIGHT
Unknown
I/O PORTS
2 joystick, 2 cardridge slots, Tape-recorder, RGB (Scart socket), TV aerial, Composite video, Parallel printer, Serial RS232