Zenith Z-100 PC series Service Manual page 81

Page
2-4
Configuration
Jumpers
The jumper connection at J20l is permanently closed and cannot be
altered. Jumpers J202 and J203 (Table 2-3) specify the size of the system
RAM, and jumpers J204 and J205 address and enable the parallel port
(Table 2-4). Jumper J206 should be left OFF (unjumpered) for RFI
reasons.
Table 2-3: Jumpers J202 and J203 Settings
JUMPER DEFINITION
J202/J203 Used to configure the CPU/memory card's memory banks
in terms of how many 256-kilobit devices are installed.
Settings are as follows:
ON/ON No banks contain 256-kilobit RAM
devices
ON/OFF
Bank 0 contains 256-kilobit RAM de ­
vices
OFF/ON Banks 0 and I contains 256-kilobit
RAM devices
OFF/OFF
=
All banks contain 256-kilobit RAM
devices
NOTE: Each bank must contain only one type of RAM
device, and must be completely filled before devices may
be installed in the next bank. If 256-kilobit devices are
used with 64-kilobit devices, they must be installed in the
lower-most banks.