IMS IMSAI 8080 User Manual page 316

USER'S GUIDE
REVISION 1
SIO INTERRUPT SELECT SOCKET
03
SIO 232 CLOCKS JUMPER' OPTIONS
LOCATION A1
I 2-1S; 4-13 OR
ORIGINATE CLOCK
FOR ASYNC
] USE — r
CLOCK
r e c ie v e
Program 825T for xl 6 for asynchronous operation,
x l for synchronous.