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4. 1/O MAP
ADRS DEVICE
VO
FF
EO
Ee
*FDC
DO
SYSTEM
RESERVE
CO
AREA
BO
PPI
AB
PSG
AO
VDP
98
PRINTER
EE
aid
*RS-232C
80
UNDEFINED
*
means
the
(Asterisk)
I/O ADR
RW
&H98
W
R
&H99
W
R
&HAO
W
&HA1
&HA2
R
&HA8
W
R
&HA9
W
R
&HAA
W
R
&HAB
W
&H90
R
R
&H91
&H80
R
&H81
R
of
expansion
devices.
use
—100
Contents
data
Write
to
V-RAM
data
Read
from
V-RAM
Address set
Command,
Status read
Address
latch
Data write
read
Data
a data
write
Port
a data read
Port
data
Port
write
B
data read
Port b
c data
Port
write
data
Port c
read
Mode
set
Strobe output
input
Status
data
Print
Data write
read
Data
Mode
set
Status read
—
Reference
TMS9129NL
(or compatible chip)
AY-3-8910
(or compatible chip)
8255A
compatible
(or
chip)
latch output
BUSY"1'
latch output
e
En
pairs
EM)
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