Spectravideo SVI-318 MKII
A revised version of the SV-318, launched in 1984.  Some color changes on the outside, and a brand new motherboard inside.
 All pictures of the SVI-318 MKII are (C) Heiko Heinz: www.homecomputermuseum-xanten.de



MANUFACTURER   Spectravideo
TYPE   Home Computer
YEAR   1985 January
BUILT IN LANGUAGE   Microsoft Extended BASIC
KEYBOARD   Rubber keyboard with built in joystick
CPU   Zilog Z80 A
SPEED   3.6 MHz
RAM   16 kB (up to 144 kB)
VRAM   16 kB
ROM   32 kB
SCREEN 0: Text mode 40x24 characters, two colors (background+foregrund).
Fonts are formed using a 6x8 pixel matrix.  Sprites are not available in this mode.
SCREEN 1: High resolution graphics mode: 256x192, 16 colors. Sprites are available.
Colour resolution is 8x1 pixels: that is, for every group of 8x1 pixels, only one foreground/background color pair may be displayed.
This is a standard TMS-9918A limitation.
Text is also supported in SCREEN1, allowing up to 43x24 characters (with two pixels chopped off the 43rd character).
SCREEN 2: Low resolution graphics mode: 64x48, 16 colors.  Sprites are available.
The screen is addressed and formed using full 256x192 resolution, with 4x4 block graphics (each 8x8 pixel matrix holds four low resolution pixels).  Sprites are displayed at high resolution (256x192).
Text is also supported in SCREEN2, allowing up to 11x6 characters (with two pixels chopped off the 11th character)
TEXT MODES   40 chars x 24 lines (optional 80 x 24)
GRAPHIC MODES   256 x 192 dots
SOUND   Three channels, 8 octaves
I/O PORTS   Audio/Video, Tape, Joystick (2), Cartridge, Super Expander
POWER SUPPLY   External power supply.  9V AC & 16V AC out
PERIPHERALS   SVI-903 Data Cassette Recorder, SV-601 Super Expander, SV-602 Single Slot Expander, SV-902 Floppy Disk drive (external), SV-901 Dot Matrix Printer, SV-805 RS-232 Interface, SV-105 Graphic Touch Tablet, SV-803 16K RAM Pack, SV-807 64K RAM Pack, SV-802 Centronics Interface, SV-701 Smart Modem, SV-801 Dual Disk Drive Controller, SV-806 80-Column Display adapter, SV-603 Coleco Game Adapter, SV-101 Quickshot Joystick
PRICE  $299

 SVI-318MKII Peripheral Map

   SVI-318MKII rear view

    SVI-318MKII side view

     SVI-318MKII motherboard.  A much more streamlinded design compared to the original SV-318.
     Most of the TTL chips is replaced by a ULA chip.

    SVI-318MKII User's Manual