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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
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NAME |
SVI-318 MKII |
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MANUFACTURER |
Spectravideo |
|
TYPE |
Home Computer |
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ORIGIN |
U.S.A. |
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YEAR |
1985 January |
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BUILT IN LANGUAGE |
Microsoft Extended
BASIC |
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KEYBOARD |
Rubber keyboard
with built in joystick |
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CPU |
Zilog Z80 A |
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SPEED |
3.6 MHz |
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RAM |
16 kB (up to 144
kB) |
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VRAM |
16 kB |
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ROM |
32 kB |
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GRAPHICS |
TMS9918A
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) |
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TEXT MODES |
40 chars x 24 lines
(optional 80 x 24) |
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GRAPHIC MODES |
256 x 192 dots |
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COLORS |
16 |
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SOUND CHIP |
AY-3-8910 |
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SOUND |
Three channels, 8
octaves |
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I/O PORTS |
Audio/Video, Tape,
Joystick (2), Cartridge, Super Expander |
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BUILT IN MEDIA |
None |
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POWER SUPPLY |
External power
supply. 9V AC & 16V AC out |
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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 |
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PRICE |
$299 |
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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
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