Pioneer PX-7(HB)
This page was last modified 13:55, 16 December 2021 by Mars2000you. Based on work by Sander and Rderooy and others.



The service manual indicates that the PX-7 HE is the European model, and PX-7 HB type is the UK model. However, the box of the computer indicates PX-7(BK), which can be confused with the Japanese Pioneer PX-7(BK).

The international Pioneer PX-7(BK) is an MSX1 computer, aimed at the UK market. It was meant for attaching to a LaserDisc player, and as such has superimpose capabilities. The PSG sound is stereo, contrary to almost all MSX machines.

Unlike the Japanese PX-7, this model was only available in black. Compared to the Japanese machine, the composite video in and out connectors use BNC rather then RCA, it does not have hue control (which is really more an NTSC issue), and it does not have a 3.5mm data recorder input.

The separate keyboard has the reference AWX-323.


  • There was also meant to be a European version, the PX-7 HE according to the service manual but it seems it was never released.
  • No PAL compatible LaserDisc software was ever released for the Pioneer system, and the Japanese NTSC releases are not compatible with the international Pioneer PX-7(BK)
Brand Pioneer
Model PX-7(HB) - note: to not be confused with the Japanese Pioneer PX-7(BK)!
Year 1985
Region United Kingdom
Launch price
RAM 32kB in slot 0
Media MSX cartridges, Cassette interface
Video TMS9129NL
Audio PSG (YM-2149)
Chipset none (separate IC's)
Keyboard layout QWERTY with a "£" key
Extras Superimposer, P-BASIC 1.1, sliders for volume level and mixing level, stereo LaserDisc sound, stereo PSG sound
Emulation ROMs dumped and emulated with exception of the superimpose functionality


PX-7(HB) with manuals
Pioneer PX-7(HB)
Pioneer PX-7(HB) with box
Pioneer PX-7(HB)
Pioneer PX-7(HB) back
Pioneer PX-7(HB) keyboard
Pioneer PX-7(HB) box
Pioneer PX-7(HB) label
PX-7(HB) keyboard label


The international PX-7(BK) is a MSX1 with a Z80A from NEC (D780C-1). The computer has 2 cartridge slots, one at the top and one at the rear. It doesn't contain an MSX-Engine.

  • Unit size: 420 x 323.5 x 70 mm (W x D x H)
  • Keyboard size: 420 x 171 x 47.5 mm (W x D x H)
  • Total weight: 7.6kg (with complete packaging)

Slot Map

Slot 0 Slot 1 Slot 2 Slot 3
Page C000h~FFFFh 32kB RAM Cartridge
Slot 1
Slot 2
Page 8000h~BFFFh
Page 4000h~7FFFh Main-ROM P-BASIC
Page 0000h~3FFFh
  • The P-BASIC ROM is a 8kB ROM - 4000h-5FFFh, and in same slot 07FFEh~07FFFh are addresses to access to expansion I/O registers.


  • RGB digital output (DIN 45326 type 8A)
  • RF output (RCA)
  • Composite input/output (BNC)
  • Analog stereo sound input/output (RCA)
  • Analog mono sound output (headphone jack)
  • Keyboard connector (13 pin DIN)
  • Data Recorder connector
  • Centronics compatible Parallel port for a printer
  • 2 general connectors (Joysticks, Mouse, Paddle controllers, etc)
  • 2 cartridge slots
  • System control input/output 1 (mini stereo jack x2)
  • System control output 2 (mini mono jack)
  • System control output 3 (DIN 45326 type 8B)
  • Power plug for main power supply

External Links