SVI-738

The Spectravideo SVI-738 X'Press is an MSX1 compatible home computer manufactured by Spectravideo from 1985. Although compatible with the MSX 1.0 standard, it incorporates several extensions to the standard (80-column display, serial RS-232, built-in 3.5" floppy drive); many are hardware-compatible with the MSX 2.0 standard but the system as a whole is not, leading to it being referred to as an "MSX 1.5" computer.

Spectravideo SVI-738 X'Press
DeveloperSpectravideo
TypeHome computer
Release date1985
Introductory price£399.99
590000zł
Media3½-inch floppy disks, ROM Cartridge, Cassette tapes
Operating systemMSX BASIC
MSX-DOS
CP/M 2.2
CPUZilog Z80A @ 3.58 MHz
Memory64 KB (+16 KB video memory)
Display256x192 pixel resolution, 256 colours
InputKeyboard
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Along with the Sony HB-101, Canon V-8, Casio MX-10 and Hitachi MB-H1, it was a portable computer based on the MSX standard, hence the title "X'Press". It came packaged with its own carrying bag in addition to the manuals, booklets and software (CP/M 2.2 and MSX-DOS 1.0) a disk containing a special demonstration program featuring an astronaut flying about on the screen, demonstrating the computer's graphic capabilitites and listing facts about the computer's ROM and RAM sizes.

Along with the disk drive and integrated serial port, what stood out the most was the use of the graphics chip specified by the MSX-2 standard, although the use of only 16 KB of VRAM allowed you to add only an 80 column mode. This, together with bugs in the first model's design (Konami SCC-sound based cartridges do not work or have bad sound) are among the reasons for the "MSX 1.5" moniker.

It ran Microsoft Disk BASIC 1.0 from ROM when turned on if no disk or a non-autoexecutable disk was inserted.

Marketing

The computer was marketed mainly in Europe, Australasia and the Middle East. In Poland, it was marketed by Centralna Składnica Harcerska at a price of 590 000 Polish złotys (the average salary for two months at that time) and the only MSX computer to be marketed in Poland, which equipped several schools. This version of the SVI-738 was sold with an altered keyboard and ROM in order to provide Polish-specific characters. It could also be found in schools in Finland . In Spain, it was initially distributed by Indescomp until the creation of a Spanish subsidiary. In the United Kingdom, it was sold for £399.95. The SVI-738 was also sold in the United States.

Technical specifications
Microprocessor
  • Zilog Z80A with a clockspeed of 3.58 MHz.
Memory
  • ROM: 56 KB
  • RAM: 64 KB
  • VRAM: 16 KB
Video
  • Graphical resolution: 256 x 192 pixels
  • text modes: 80 characters x 24 and 40 characters x 24 lines and 32 characters x 24 lines
  • colors: 16
  • sprites: 32
Sound
  • 3 sound channels
  • 1 noise channels
  • 1 envelope controller
Connectors

See also
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