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3-3-4. GENERAL I/O Access
The general I/O access ref erred to here covers I/O devices
connected to data bus
!ODO
to
IOD7
and accessed using the chip
select signal output by WSC-PARK.
The chip select signals
and the devices they refer to are listed below.
Device
Real Time Clock
Serial Communication
FloppyDisk Controller
<CPU>
1/0 device address output
R/W =output
FCO - 2 output
SIZO,
1 = output
IC
MK48T02 (B)
LH8530A
uPD72067G
AS= DS = "L"
<MEMC>
PORT output
Chip select signal
RTC
SCC2
FDC
< CDECR >
IOSEL output
<PARK>
IOBSEL output
Chip select output
100 buffer
enabled
CS enabled
IORD/WR output
Data read/write
~
------------------------------------------------------------------------------- --------
-~
I/ 0
DSACKIO output
DSACKO
AS= DS
=
"H"
'------~
PORT negated
' - - - - - . . . . . i
IOSEL negated
IOBSEL negated/
.___ _ _ _ _.CS negated/
End of cycle
3-12
IORD/WR negated/
DSACKIO negated
NWS-1510/1530/1580
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