IBM 4247 Maintenance Information page 267

Microcode
Module U1
Microcode
Module U2
Bevel
Corner
Cut Off
4247 A00 Level 1 Logic Board
Microcode
Module U2
Microcode
Module U54
4247 A00 Level 2 Logic Board
Microcode
Module U57
Microcode
Module U2
Microcode
Module U54
4247 A00 Level 3 Logic Board
Microcode
Module U57
Microcode
Module U2
Corner Cut Off
Bevel
4247 A00 Level 4 Logic Board
Figure 38. Rear View of Logic Board Microcode Module Locations and Orientation - Model A00
Corner
Cut Off
Bevel
Corner
Cut Off
Bevel
Microcode
Module U54
267
Chapter 4. Locations