Specifications

2 - 10
As mentioned previously, the required access time for devices plugged into U32 and U33 is 300
nS (or faster), on both 12 MHz and 16 MHz boards.
Note
When a byte-wide memory device is enabled, its memory
address space is unavailable for use by other devices on the
AT bus. A byte-wide socket must be marked as "disabled"
by means of the Ampro SETUP utility before its memory
space can be used for other purposes.
2.3.5 Battery-Backed Clock
The Little Board/286 provides, as a standard feature, an AT compatible battery-backed real time
clock (with CMOS RAM). Included within the clock module is a lithium battery, so no external
backup battery is required. At ten-year intervals, the entire device should be replaced. Oversized
solder pads have been provided to facilitate this maintenance operation.
The real time clock date and time values and various parameters within the nonvolatile
Configuration Memory are initialized at the factory for a standard configuration. The date and time
are also set at the factory, but may not be set for your time zone. Use the Ampro SETUP utility
to change these values as needed (see Chapter 3).
2.3.6 Video Display Mode Jumpering
Regardless of what type of video display controller is used -- whether by means of an onboard
video expansion module or by means of a controller connected externally on the AT Expansion
Bus -- a jumper (W22) on the Little Board/286 must be properly configured to indicate to the
ROM-BIOS whether the board's powerup (or reset) video state should be color or monochrome.
W22 is jumpered as indicated in Table 2-8.
Table 2-8. Video Mode Jumper (W22)
VIDEO MODE W22
Mono (MDA or Hercules) open
Color (CGA, EGA, VGA) short