Lexicon MPX-1 User Manual (English)

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Bits

through

the

opcode

contain

the

"command number"

which

there

are

possible

(one

command

reserved).

The

first

10 commands

have

already

been

defined

and

the

remaining

may

implemented

by you.

Command

"OF"

reserved,

and

invoked

will

translated

internally

NOP

command.

The INT

bit

(bit

the

opcode

byte

the

INTERRUPT

ENABLE

bit.

this

bit

set

one

the

opcode,

the

MPX

will

cause

interrupt

(SOD

interrupt)

when

has

completed

the

command.

this

bit

zero,

interrupt

will

not

generated

when

the

command

has

completed

execution.

Note

that

order

for

the

interrupt

make

the

bus,

must

jumpered

inter-

rupt

line

(see

the

hardware

configuration

section

this

document

for

further

details)

•

The

CONT

bit

(bit

the

opcode

byte

the

CONTINUE

bit

and

asso-

ciated

with

the

link

structure.

the

CONT

bit

set

high,

execution

the

command

(pointed

the

link

address)

will

commence

immediately

after

execution

the

current

command

complete.

the

CONT

bit

zero,

the

MPX

will

stop

when

execution

the

current

command

complete,

and

wait

for

another

ATTN

before

executing

the

command.

There

are

two

considerations

when

using

the

CONT

bit.

the

INT

bit

ignored

the

CONT

bit

set.

This

means

will

only

occur

no command

follow,

which

the

way

want

things

happen

when

executing

sequence

commands.

The

firs!..

that

interrupt

one

would

normally

Secondly,

the

link

address

points

the

beginning

this

same

instruc-

tion

(pointing

itself)

and

the

CONT

bit

set,

endless

execution

the

instruction

will

occur.

This

could

useful.

The way

stop

execution

would

change

the

opcode

that

the

CONT

bit

zero.

The

opcode

could

changed

NOP,

merely

the

same

opcode

the

CONT

zeroed.

ther

the

system

CPU

the

MPX

could

change

the

opcode.

NOT

try

change

the

link

address

the

fly!

Bit

unused

and

really

"don't

care"

bit,

but

a good

practice

would

always

set

this

bit

zero.

STATUS

INDICATION

BYTE

This

byte

used

"handshake"

with

the

MPX

when

the

use

completion

interrupt

not

desired,

they

may

used

conjunction.

This

byte

should

set

zero

before

ATTN

sent

the

MPX.

When

the

MPX

done

executing

the

command,

will

set

this

byte

hex.

non-interrupt

environment,

this

byte

should

checked

before

another

command

sent

the

MPX.

the

CONT

bit

set

the

command

opcode,

the

status

byte

for

that

particular

command

will

NOT

set

hex.

This

means

that

sequence

commands,

only

the

status

byte

the

last

command

(the

one

with

CONT

will

set

hex

•

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Lexicon MPX-1 Specifications

General

A/D Conversion	24-bit
D/A Conversion	24-bit
Sampling Rate	44.1 kHz
Dynamic Range	> 100 dB
Effects	Reverb, Delay, Chorus, Flange, Pitch Shift
Inputs	2 x 1/4" TRS
Outputs	2 x 1/4" TRS
MIDI	In, Out
Control	Front panel controls, MIDI
Power Supply	AC adapter (included)
Frequency Response	20 Hz - 20 kHz
Dimensions	19" x 1.75"
Type	Dual Channel Multi-Effects Processor
Presets	200 (100 Factory, 100 User)
Total Harmonic Distortion	<0.01% (20Hz-20kHz)