Fairlight ESP - CMI Model IIx - Music Workstation
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Equipment:
CMI Model IIx
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Information
The Fairlight Computer Musical Instrument is a complete
music production and performance instrument. It is a special
purpose computer system incorporating a custom dual M6809
central processor interfaced to special input-output devices
optimised for the rather unusual requirements of music
production.
The C.M.I. is a complex special-purpose computer system
which embraces many different hardware and software
technologies. All processing and sound generation functions
are performed by the Mainframe, while the Graphics Terminal
and Keyboards serve as peripherals for operator interfacing.
The mainframe is capable of operating quite autonomously,
that is, it is not reliant on any external connections for
proper functioning. Under certain conditions it is possible
for a fault condition to inhibit proper Mainframe operation,
so the serviceperson should be wary of being mislead. Of
course, without the peripherals connected it is often hard
to know if the system is functioning properly, but this
point should be borne in mind when troubleshooting.
Operator input to the Mainframe comes from three sources:
music keyboard, alphanumeric keyboard and lightpen.
Output devices include the Graphics Display terminal and the
audio outputs. A printer may also be optionally used.
The heart of the system is the Central Processing Module,
which U3es two
Motorola 6809 microprocessors in a
dual-processor configuration. Both processors share a common
buss which allows them both to communicate with the other
cards in the Mainframe.
The Processor Control Module provides EPROM for system
startup and bootstrap, RS-232C serial input from the
keyboard, serial output to the keyboard and printer, and
various other C.P.U. support functions such as interrupt
prioritisation.
Main program memory is the 256K RAM card. This holds all the
operational software, much of which is overlayed from disk
as the code exceeds 25ÖK.
The Floppy-disk controller uses Direct Memory Access
techniques to transfer data between memory and the two
floppy-disk drives.
The Graphics Display is a bit-mapped image of 16K bytes of
VRAM. This is displayed as an array of 256 by 512 points.
Special hardware provides support functions for automatic
vector drawing, which considerably enhances the speed of
displaying graphical Information. Hit and touch signals from
the Lightpen are interfaced to the system buss.
Eight identical Voice Modules also share the buss. They each
have 16K bytes of waveform RAM, as well as all the control
and audio circuits required to support it.
A Voice Master module controls the voice modules, as well as
providing the Analog-to-Digital converter function of the
system.
Audio from the Voice Modules is buffered by the Audio Output
Module, which provides independent balanced outputs for each
channel as well as a mixed (LINE) output.
Service and user manual
Manual type:
Service and user manual
Pages:
379
Size:
28.9 MB
Language:
english
Revision:
2.1
Manual-ID:
Date:
Quality:
Scanned document, reading partly badly, partly not readable.
Upload date:
Aug. 16, 2017
MD5:
b61ed70f-f2c6-cc52-e6ad-add847094c18
Downloads:
581