Jumper Configurations
Table A-1
Jumper Descriptions (continued).
JUMPER #
DESCRIPTION
W55-W59
These jumpers control the memory map for
sockets 3D1, 5D1, 7D1, and 9D1. They also
affect the location of the 32K battery-backed
RAM (BRAM). The "Memory Addressing"
table on the following three pages clearly
describes the memory map for each jumper
combination.
An "X" indicates that the
jumper may be in or out. Factory defaults for
STD DOS and STD ROM are shown below.
JUMPER IN
JUMPER OUT
STD DOS
W55, W59
W56, W57, W58
STD ROM
W55-W57, W59
W58
Notes:
1.
W68A must be installed for 512K RAM devices. Use the "B"
position for 128K and smaller devices.
2.
W67 must be installed for 256K EPROMs installed in location 5D1
when the board is configured for a 512K RAM. This allows SLIN*
(bit 3 of the WCR register of the printer port) to enable the lower
128K of the 256K EPROM. The "Memory Addressing" table on the
following three pages shows how the memory map is affected by
SLIN*. W55, W56, and W67 must be IN, OUT, IN respectively for
SLIN* to have any effect on the memory map.
3.
32K and 64K devices may be used, but will be redundantly mapped
within the memory space shown in the table.
A-41
