Spectravideo SVI-728
This page was last modified 08:50, 16 February 2022 by Mars2000you. Based on work by Rderooy and Gdx and others.



Spectravideo was a American company that was selling MSX computers in many countries.

The SVI-728 was one of the most popular MSX1 models in many countries. Looks almost identical to its predecessor, the pre-MSX SVI-328. The main chips also are same but its architecture is very different from MSX.

The power supply is external and a little bit big.

It was available in 5 versions to support different QWERTY keyboards :

  • International
  • Arabic
  • Danish/Norwegian
  • Spanish
  • Swedish/Finnish

The Arabic version (MSX عرب) includes an additional ROM, produced by Micro-Cat, allowing to use MSX-BASIC in the Arabic language.

This computer was sold with a demo tape.

Brand Spectravideo
Model SVI-728
Year 1984 (Arabic version : 1987)
Region Europe, Middle East
Launch price BE: 18.990 BF (imported by Electronics Belgium NV)
DE: 998 DM (imported by Jöllenbeck GmbH)
ES: 67,500 Pts
FI: 2780 FIM (Imported by Teknopiste Oy)
FR: 3500 FF (imported by Serepe)
NL: ƒ1189 (imported by Electronics Nederland bv)
UK: £250
RAM 64kB in slot 1
Media MSX cartridges
Video Texas Instruments TMS9928A or TMS9929A
Audio PSG (AY-3-8910)
Chipset none (separate IC's)
Keyboard layout (Non-Arabic) QWERTY with variations + numeric keypad
(Arabic) QWERTY/Arabic + numeric keypad
Extras demo cassette
Emulation The International, Spanish and Swedish/Finnish versions have been dumped and emulated ("SVI-728", "SVI-728 ES" and "SVI-728 SE" respectively). The rear expansion port is treated like a regular MSX expansion slot. For other regional versions a ROM dump is needed. See this thread for details. Note that the Arabic ROM has already been dumped.


SVI 728
SVI-728 localised for Arabic countries
SVI-728 localised for Spain
SVI-728 AC Adapter


The SVI-728 is a MSX1 with a numeric keypad (rare for a MSX1). The CPU is a Z80A from SGS (Z8400AB1).

Spectravideo also sold a 320kB floppy disk drive (the SVI-707) which connects directly to the expansion bus port on the back of the SVI-728. This expansion bus port is effectively an MSX cartridge slot, but with a different connector.

The SVI-318 and SVI-328 use the same power supply.

Slot Map for all models except the Arabic model

Slot 0 Slot 1 Slot 2 Slot 3
Page C000h~FFFFh Main-ROM
64kB RAM Cartridge
Page 8000h~BFFFh
Page 4000h~7FFFh Main-ROM
Page 0000h~3FFFh
  • The Main-ROM in Slot 0 is mirrored to 8000-FFFF

Slot Map for the Arabic model

Slot 0 Slot 1 Slot 2 Slot 3
Page C000h~FFFFh 64kB RAM Cartridge
Page 8000h~BFFFh Arabic ROM
Page 4000h~7FFFh Main-ROM
Bank 0000h~3FFFh


Special features

You can select an alternative color palette with the command VDP(0)=VDP(0)OR1

Color number Standard color Alternative color
0 Transparent Very dark brown
1 Black Black
2 Medium green Light brown
3 Light green Very light brown
4 Dark blue Dark blue
5 Light blue Blueish grey
6 Dark red Green
7 Cyan Light red
8 Medium red Green
9 Light red Light green
10 Dark yellow Yellowish green
11 Light yellow Light yellowish green
12 Dark green Brown
13 Magenta Gray
14 Gray Light gray
15 White White

External links