Rockwell R6532 Ram Input Output Timer 40 pin integrated circuit used in many Gottlieb pinball CPU boards.
128 x 8 satic RAM
Two 8 bit bidirectional data ports
Programmable internal timer with interrupt
TTL & CMOS compatible peripheral lines
One port has direct transistor drive capability
Programmable edge-sensitive interrupt input
8 bit bi-directional data bus
6500/6800 bus compatible
Single +5v power supply
Reference:
6532
R6532
R6532P
XO-361
XO361