Specifications

Table H. U15 Device Jumpering
SIZE DEVICE TYPE TYPICAL W12 W13 W14 W15 W16 W41 W8
(BYTES) DEVICE
81(
No .... ' EPRat
2764 short
open short open
open
2/3 short
32K No .... l EPRCJII 27256
short
open
short short open
2/3 open
1281(
Page-acidr EPRCJII 27011
short
open short open
short
2/3
open
81(
28-Pin SRAM 6264 short
open open open
short
open
short
32K 28-Pin SRAM 62256 short
open short open
short 1/2
open
2.3.4 Battery-Backed Clock Module
An Ampro SmartClock battery-backed real time clock module can be plugged into any of the
board's three 28-pin memory option sockets (U15, U21, or U26).
If a memory device is also required in the socket used for the clock option, it can be plugged
directly into
the 28-pin socket on the clock module. When this is done, the memory device is
accessed as though the clock option is not present.
A software utility
is provided with the SmartOock option which can be used to initialize the
clock module for correct ~te and time, as well as to automatically set the DOS system clock
from
the hardware real time clock on system powerup.
2.3.5 Video Display Mode Jumperlng
No matter what type of video display controller is used, two jumper options (W19 and W31)
on the board must be properly confIgured to indicate the desired video mode to the ROM-
BIOS. Table 2-7 shows the video display mode jumper settings.
Table 2-7. Video Display Mode
VIDEO MODE W31 W19
EGA/VGA
short short
640 X 200 CGA short open
320 X 200 CGA open short
Monochrome (SO X 25)
open open
W19 and W31 correspond to switches 5 and 6 of a standard PC motherboard, and are used to
specify the powerup default of the video display controller. Not that the EGA/VGA video
mode (W19, W31 both on) must be set when a memory conftguration of 768K is to be used,
as described. elsewhere in this chapter.
Refer to the video controller's technical manual for its proper jumper settings.
2-9