Pioneer PX-7
This page was last modified 11:01, 23 December 2022 by Mars2000you. Based on work by Rderooy and Gdx.



The Pioneer PX-7 is a MSX1 computer, aimed at the Japanese 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.

The PX-7 was available in 2 versions:

  • in silver with lilac keyboard keys, just like the PX-V7 which seeems to be identical - the separate keyboard has the reference AWX-280
  • in black only mentioned on the box as PV-7(BK)- the separate keyboard has the reference AWX-307 - Note: Confusingly a black version was also released in the UK as the Pioneer PX-7(BK)

The package of both versions includes the RF converter PX-RF7 for using on an NTSC TV.

Brand Pioneer
Model PX-7
Year 1984-04 (silver version) - 1984-12 (black version)
Region Japan
Launch price ¥89,800
RAM 32kB in slot 0
Media MSX cartridges
Video TMS9928ANL
Audio PSG (AY-3-8910)
Chipset none (separate IC's)
Keyboard layout QWERTY/JIS
Extras Superimposer, P-BASIC 1.0, sliders for volume level and mixing level, stereo LaserDisc sound, stereo PSG sound
Emulation ROMs dumped and emulated except for superimpose functions


Pioneer PX-7 silver
Pioneer PX-70 silver - box
Pioneer PX-7 black
Pioneer PX-7 silver - computer
Pioneer PX-7 silver - keyboard
PX-7 silver - keyboard label
Pioneer PX-7 label
PX-7 black - keyboard label
Pioneer PX-7 black - computer
Pioneer PX-7 black - keyboard
PX-7 siver with manuals
PX-7(BK) - box and manuals
Pioneer PX-7 silver - box and content
Pioneer PX-7 main PCB
Pioneer PX-7 video PCB
Pioneer PX-7 back


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: 8.1kg (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 Mod output (5 pin DIN, RF converter PX-RF7 is required for use with a TV)
  • Composite input/output (RCA) with hue adjust dial
  • Analog stereo sound input/output (RCA)
  • Analog mono sound output (headphone jack)
  • Keyboard connector (13 pin DIN)
  • Data Recorder connector (both DIN and mini-jack)
  • 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
  • AC power socket (for the monitor)

External Links