Zenith Z-100 PC series Service Manual page 87

Chapter 4
Detailed Circuit Description
This chapter describes the operation of the most important components
on the CPU/memory card. Refer to the schematics while reading this
chapter.
8088-2 Microprocessor
The 8088-2 microprocessor used in the CPU/memory card is manufac­
tured using HMOS technology. This device is functionally identical to
other 8088-type microprocessors, however, it is capable of operating at
much higher clock frequencies. In the Z-158, the microprocessor can be
driven at either 4.77 or 8.0 MHz clock frequencies. Figure 4-1 identifies
the pinouts of this device, and Table 4-1 identifies and describes each
signal.
Figure 4-1: 8088-2 Microprocessor Pinouts