IBM 1 Series - Page 82

Board (card side)
| |
/-t—— 1/2-width board ——>}
lai pyc ,D,E FIG ,H,I,K,;L{M,N,P1Q
Pin assignments
(card side)
ABCDE
OOO00 ' Card column
Card row
OS@OSO 2
CO eLeO 3 Subcolumn
Se
Subrow
OBO WS 4
O@06O S
O@0OBO 6
OSB0BO 7
O@0@0 8 A 2B 0 3
OS808O 9 Addressing scheme
OS08BO 10
OGOSBO 11
OS@0SBO 12
Weer Jer Johann:
\ooooo] 14
Figure 2-30. Processor and I/O expansion unit board identification
Processor I/O Channel 2-71