Korg POLY-61 - Reference Data

5. REFERENCE DATA
IC8255A-5 PROGRAMMABLE PERIPHERAL INTERFACE
PIN CONFIGURATION
8255A BLOCK DIAGRAM
PIN NAMES
d 7 - d 0
DATA BUS (Bl DIRECTIONAL)
RESET RESET INPUT
CS CHIP SELECT
RD READ INPUT
WR RITE INPUT
AO, A1 PORT ADDRESS
PA7-PA0 PORT A (BIT)
PB7-PB0
PORT B (BIT)
PC7-PC0
PORT C (BIT)
Vcc
+5 VOLTS
GND 0 VOLTS
BI-DIRECTIONAL
DATA BUS
IC8253C-5 PROGRAMMABLE INTERVAL TIMER
BLOCK DIAGRAM
PIN NAMES
DATA BUS (8 BIT) _
COUNTER CLOCK INPUTS
COUNTER GATE INPUTS
COUNTER OUTPUTS _
READ COUNTER _
WRITE COMMAND OR DATA
CHIP SELECT _
COUNTER SELECT _
4-5 VOLTS _
GROUND
PIN CONFIGURATION
OUT o □ 10
24 JVcc
23 3wR
22 ^RD
21 DCS
20 3 A ,
8253 19 3 A o
18 3 CLK 2
17 3 OUT 2
16 3 GATE 2
15 3 CLK 1
14 3 GATE 1
13 3 OUT 1
IC8049 SINGLE COMPONENT 8-BIT MICROCOMPUTER