Philips NMS 8260
This page was last modified 17:09, 3 November 2021 by Mars2000you. Based on work by Rderooy and Gdx.



The NMS 8260 is a very rare computer, it's actually an unreleased prototype, developed by Sanyo in association with JVC, and using the same case as used for the NMS 8250 and NMS 8255.

By comparison with these machines, there are some changes:

  • there's no floppy disk drive, but the standard NMS 8250/8255 floppy disk interface with rom is still present
  • JVC has provided an internal 20MB hard disk drive with a hard disk controller and an interface with ROM; apparently, this HDD was also tested with the Victor HC-90 and HC-95 computers, but was not added to these machines for the public release (see message after booting of the NMS 8260)
  • the second cartridge slot is replaced by the HDD interface and a connector to add an external floppy disk drive

Since the HDD is in slot 2, it boots as the first diskrom (drive A:). If an external floppy drive is connected, the standard NMS 8250/8255 diskrom will add drive C: en D: as floppy drives.

There's only one partition on the hard disk, FAT12 formatted, and it's not possible to use sub-directories as MSX-DOS2 and version 2 of Disk BASIC are absent in this prototype.

Brand Philips (Manufacturers: Sanyo and JVC)
Model NMS 8260
Year 1987
Launch price unreleased
RAM 128kB in slot 3-2
VRAM 128kB
Media MSX cartridges
Video Yamaha V9938
Audio PSG (YM2149 integrated in MSX-Engine S3527)
Chipset Yamaha S3527
Keyboard layout QWERTY + numeric keypad
Extras reset button, internal 20MB hard disk drive, connector for external floppy disk drive
Emulation ROMs dumped but machine not emulated


Philips NMS 8260 front
Philips NMS 8260 back
Philips NMS 8260 right side
Philips NMS 8260 inside
Philips NMS 8260 hard disk drive


The NMS 8260 is an MSX2 with a Z80A from NEC (D780C-1), an MSX-Engine S3527 from Yamaha and an internal HDD from JVC.

Slot Map

Slot 0 Slot 1 Slot 2 Slot 3-0 Slot 3-1 Slot 3-2 Slot 3-3
Page C000h~FFFFh Cartridge
Page 8000h~BFFFh Mirror
Page 4000h~7FFFh Main-ROM HDD ROM Disk ROM
Page 0000h~3FFFh Sub-ROM Mirror
  • The 16KB Sub-ROM is mirrored over pages 0 to 3 in slot 3-0
  • The Disk ROM is a 16kB ROM - 4000h-7FFFh. However, the FDC registers are visible on all 4 pages.


  • RGB output (SCART)
  • RF output (UHF)
  • Analog sound & Composite video
  • Luminance video output connector (for monochrome monitors)
  • Keyboard connector
  • External floppy disk drive connector (on the right side)
  • Data Recorder connector
  • Centronics compatible Parallel port for a printer
  • 2 general connectors (Joysticks, Mice, Paddle controllers, etc)
  • 1 cartridge slot (on the right side)