Lexicon MPX-1 - Hardware Settings and Jumpers

INTERRUPT ACKNOWLEDGE RESPONSE ON THE BUS
The MPX-1 may provide a single byte of data during bus interrupt acknow-
ledge cycles. This response must be enabled by a switch. The data to be passed
during interrupt acknowledge cycles is written to the latch a~ address B007
~ . - -~--- - ~ n - - -~_"~ U" .. a ~ n r hp ;In d~r"",e-",s-",s---"m ... a.,.p,---,a"-,b,,-,o,-,v,-,e-1)~' _
PADDLE
IF ADDRESS
BIT
1
·
·
·
·
·
· ·
·
A7
2
·
· ·
A6
3
A5
"ON"
"a ..
4
·
·
· ·
·
· · ·
A4
5
·
· ·
A3
6
... ,.
A2
"OFF"
"1"
7
· ·
·
· ·
· · ·
A1
8
· ·
•
·
AO
STANDARD ATTN PORT ADDRESS SELECTION
The COlRpuPro "standard" port address for MPX ATTN calls is Fl hex. To set
the MPX-1 to respond to ATTN calls on port F1 hex. set Sl as follows: Paddles 1-
4 and paddle 8 should be OFF. Paddles 5-7 should ON.
S2
PADDLE if
FUNCTION
1
.-
.
· ·
"ON"
enables EPROM wait state •
2
·
"ON"
enables
interrupt
response byte.
3
DMA
priority address
3
4
·
·
DMA priority
address 2
"ON '"'
"0"
·
5
·
DMA priority
address 1
6
DMA priority
address a
"OFF"
'"'
"1"
7
·
· ·
"ON"
enables
SLAVE CLR*
to
reset MPX-l.
8 . . .
·
·
not used
9