HP 8112A Operating, Programming And Servicing Manual page 359

4. Figure B-6 shows the location of U28 and other additional
components, modify Figure 10. 7-9 accordingly.
Figure B-6. 08 1 1 6-66533: U28 layout
5. Figure B- 7 shows the RAM battery supply circuit on
microprocessor board 66533, modify Figure 10. 7-5 accordingly.
+5 v
R10
R18
R10
-=. sr1
J
RT1
24
U10
- - . . . 'i7
Figure B-7. 08 1 1 6-66533: U28 schematic
Backdating B-25