Lexicon MPX-1 User Manual

HOW TO USE THE HPX-l
A simplified block diagram of the MPX-1 appears in Figure 1. In the
following discussions, it may be useful to refer to the block diagram.
J - - _ •• z -t._~ ... A_,H,.t-\7 n .... rview of how the MPX-1 works: When the on-
I/O accesses, the on-boara .1ogl.C ~a~t::t> Io'G" '" ...... ~ .. __ •••• __ ~ •
the actual running of the bus cycle. The 8085 will "stall" until the operation
is completed allowing program operation to continue.
Sounds simple, doesn't it? Well, it is. The following sections discuss
the above overview in greater detail. First is a local address ~ap showing
where everything lives on the MPX-l.
Figure 1. MPX-l BLOCK DIAGRAM -.,
ADDRESS, STATUS
& CONTROL BUSES
DATA BUSES
DMA HANDSHAKE
5-100
BUS
VECTORED INTERRUPTS
CONTROL INPUTS
INTERRUPT OUTPUT
-i I
8-100
LOCAL
BUS
ROM
INTERFACE
AND 8085
DMA LOGIC
CPU
LOCAL
RAM
INTERRUPT
CONTR.
RST.
7.5 SOD
t ATTN
PORT
6

Lexicon MPX-1 Specifications

General

Brand	Lexicon
Model	MPX-1
Category	Recording Equipment
Language	English