Yamaha YIS-503F
This page was last modified 16:00, 20 February 2018 by Mars2000you. Based on work by Rderooy and Gdx and others.

Contents

Description

The Yamaha CX5, CX5F, CX5M, CX5MII and CX5MII/128 computers were specifically targeted at music and sound production, and as such were regarded by many as non-standard MSX machines. However, they are in fact standard MSX1 computers and can be used as such.

The YIS-503F is same as the CX5M but sold without any module. The color is gray and silver. The power supply is external. It is heavy and big. It's the adaptation for the French market of the YIS-503.

There is another model called YIS-503FB. It is indicated only on the label. It has a PAL-G output instead of RGB and the SRE-01 32kB memory expansion. This model was sold in Belgium.

Both models have an 'International' QWERTY keyboard with £ key.

Brand Yamaha
Type YIS-503F / YIS-503FB
Year 1984
RAM 32kB in slot 0 (YIS-503F) or 64kB split between slots 0 and 3-1 (YIS-503FB)
VRAM 16kB
Media MSX cartridges, side slot modules
Video Texas Instruments TMS9929A
Audio PSG (YM2149)
Chipset Yamaha YM5214
Extras

Pictures

Yamaha YIS-503F
Yamaha YIS-503F back
Yamaha YIS-503F box, computer and manuals

Specifications

The YIS-503F is a MSX1 that supports all Yamaha modules ("units").

To use the expansion bus as second cartridge slot, you need the Yamaha Single Cartridge Adapter CA-01.

To get 64kB RAM with the YIS-503F, you can insert the URM-01 cartridge in slot 1 or 2 or the SRE-01 module in side slot 3. The SRE-01 module expands slot 3: slot 3-0 becomes an extra cartridge slot and slot 3-1 hosts the extra RAM.

In all cases the additionnal RAM is placed in banks 2 and 3 (0000h~7FFFh). The 64kB RAM is split between two slots, a configuration that can cause poorly written software to crash. Also, with this layout, the POKE-1,(15-PEEK(-1)\16)*17 trick to workaround buggy software that does not handle subslots properly will not work on this machine expanded to 64kB RAM. The same problems exist also on the variant YIS-503FB.

Slot Map of model YIS-503F

Slot 0 Slot 1 Slot 2 Slot 3
Bank C000h~FFFFh RAM Cartridge
Slot
Expansion
Bus
Module
Slot
Bank 8000h~BFFFh
Bank 4000h~7FFFh Main-ROM
Bank 0000h~3FFFh

Slot Map of model YIS-503FB

Slot 0 Slot 1 Slot 2 Slot 3-0 Slot 3-1 Slot 3-2 Slot 3-3
Bank C000h~FFFFh RAM Cartridge
Slot 1
Expansion
Bus
Cartridge
Slot 2
Bank 8000h~BFFFh
Bank 4000h~7FFFh Main-ROM RAM
Bank 0000h~3FFFh

Connections

  • RGB Monitor output (YIS-503F)
  • RF output (YIS-503FB)
  • Analog video output (YIS-503FB)
  • Analog sound output (YIS-503FB)
  • Tape recorder connector
  • Centronics compatible Parallel port for a printer
  • 2 general connectors (joysticks, mouse, paddle controllers, ...)
  • 1 or 2 cartridge slots
  • 1 module slot (left side, 60 pin connector) - is used by SRE-01 unit on YIS-503FB model
  • 1 expansion bus slot (back side, 2nd or 3rd cartridge slot via CA-01 adapter)

Links