Sanyo MPC-25
This page was last modified 15:54, 18 March 2018 by Rderooy. Based on work by Mars2000you and Gdx and others.

Contents

Description

The Sanyo MPC-25 a.k.a. Wavy 25 is a computer that is very similar to the Philips NMS-8250, but has less RAM (64kB instead of 128kB) and only one cartridge slot.

Actually, both companies were working together, what explains the strong resemblances in the design of several MSX2 computers, while aiming at different markets (Japan for Sanyo, Europe for Philips).

This machine comes with a separate keyboard and in 4 different versions:

  • MPC-25F - 64kB VRAM, 1DD disk drive - official price: ¥118,000
  • MPC-25FS - 128kB VRAM, 1DD disk drive
  • MPC-25FK - 128kB VRAM, 2DD disk drive, Kanji-ROM Level 1 - official price: ¥125,000
  • MPC-25FD - 128kB VRAM, 2DD disk drive, was sold with graphic tool on disk - official price: ¥135,000

The main unit is always in white, the keyboard in gray and the special keys in black, the other keys can be gray or yellow.

A space is provisioned for the addition of a second disk drive but cannot be used due to the way the video, diskdrive (and kanji) PCB has been build inside the machine. However, the MPC-25FK model has a connector for a second external diskdrive.

The MPC-25FD has been localised for

Brand Sanyo
Type MPC-25
Year 1986
RAM 64kB in slot 3-2
VRAM 64kB (MPC-25F) or 128kB (other models)
Media MSX cartridges, 1DD floppy disks, (on FD and FK versions) 2DD floppy disks
Video Yamaha V9938
Audio PSG (YM2149 integrated in MSX-Engine S3527)
Chipset Yamaha S3527
Extras 360 or 720kB 3,5" floppy disk drive, (only FK version) Kanji-ROM Level 1, (only FD version) graphic tool on disk

Pictures

Sanyo MPC-25FS
Sanyo MPC-25FS back
Sanyo MPC-25FS
Sanyo MPC-25FK
Sanyo MPC-25FK back
Sanyo MPC-25FK
Keyboard comparison: Philips NMS 8250/55/80 and Sanyo MPC-25/27
Sanyo MPC-25FD mainboard
Sanyo MPC-25FD inside
Sanyo MPC-25FS box

Specifications

The MPC-25 is a MSX2 with a Z80A from NEC (D780C-1) and an MSX-Engine S3527 from Yamaha.

On the MPC-25F version, SCREEN 7 and 8 can't be used because the VRAM size is only 64kB.

Slot Map

Slot 0 Slot 1 Slot 2 Slot 3-0 Slot 3-1 Slot 3-2 Slot 3-3
Bank C000h~FFFFh Cartridge
Slot
Mirror Mirror 64kB
RAM
Bank 8000h~BFFFh Mirror Mirror
Bank 4000h~7FFFh Main-ROM Mirror Disk-ROM
Bank 0000h~3FFFh Sub-ROM Mirror
  • Sub-ROM is mirrored over other banks in slot 2.
  • The Disk ROM is a 16kB ROM - 4000h-7FFFh. However, the FDC registers are visible on all 4 pages. It's not a full mirror of the ROM.

Connections

  • RGB output
  • RF output
  • Analog sound & Composite video
  • Keyboard connector
  • Tape recorder connector
  • Centronics compatible Parallel port for a printer
  • 2 general connectors (joysticks, mouse, paddle controllers, ...)
  • 1 cartridge slot (on the right side)
  • 1 external diskdrive connector (only on the MPC-25FK)
  • 1 alternate AC power plug

External links