Page MSI-P563 User Manual
I. HARDWARE DESCRIPTION
A. Card Addressing
The card is I/O mapped using 16-bit addressing to select the card
on any 1K-byte boundary in the address region of 0 to 0FFFFH.
This address is a
base address which is jumper selectable using
option jumpers A10 thru A15 of JP2, as given in Table 1. An
installed jumper sets the address value to 0. Conversely, an
uninstalled jumper sets the value to 1. For example, installing
JP2-1,2 and JP2-9,10 gives a base address of 7400H.
Table 1. Base address and serial I/O jumper designations.
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Jumper Address Jumper Address
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J2-1,2
A15
J2-11,12
A10
J2-3,4
A14
J2-13,14
S1
J2-5,6
A13
J2-15,16
COMX
J2-7,8
A12
J2-17,18
COMY
J2-9,10
A11
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The
device address is a unique address defined by the the PLD
of U4. The physical address of any device is then equal to
Device Physical Address = Base A Device Address
Device addresses are given in Table 2. In the table, COM1,
COM2, COM3 and COM4 addresses use 8 contiguous bytes
with the first byte located at 3F8H, 2F8H, 3E8H and 2E8H,
respectively.
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