IBM 3270 Maintenance Manual page 665

640KB Total Memory
384KB
+
(256KB on System Board)
64/256KB Option Memory-Printer
Card Switches Adapter
(1)
1234
Memory-Printer
1001
Adapter (128KB)
with
(1) 256KB Plug-On
Card
(1)
12345678 1234
Memory-Printer
10010001 0101
Adapter (128KB)
(1) 64/256KB
Adapter with
256KB installed
(1) 64/256KB
12345678
Adapter with 10110001
256KB installed
12345678
(1) 64/256KB 01110100
Adapter with
128KB installed
6-14 Maintenance Information