Service manual

2-21_-- --------- DOUBLE-DENSITY DISK CONTROLLER
• Set switch SW501, section 4 (on the CPU logic circuit board) to 1. The Z-37
connected drives are
now the primary drives and they are now numbered as
shown in Figure 2-3 on Page 2-3. (NOTE: IF YOU REMOVE THE UNUSED
H-88-1 FLOPPY DISK I/O CIRCUIT BOARD, YOU MUST CONNECT A 4700
OHM RESISTOR TO PLUG P512 BETWEEN PINS 1 AND 12. SEE FIGURE 2-2.)
Figure 2-2