Service manual

Appendix

Changing Window Address

The LUMISCAN 50 / 75 / 85 is factory configured to use a 32-Kbyte window starting at address

D0000 and ending at D7FFF. The upper 5 bits of the address are set with the 6-position ADDRESS

SELECT SWITCH (S1-1 through S1-5) on the DATA CONTROL BOARD (DCB), switch position

S1-6 is used to set the BASE I/O ADDRESS.

NOTE: If the DCB is changed from its default address of D0000, you must add the /Mxxxx switch

to the driver load command to provide the driver the new 4-digit "SEGMENT ADDRESS". The

command would like this:

C:\LSDT\TOOLS\LSDTVxx /ME000

The following table shows how to set this switch to achieve the desired address.

ADDRESS S1-1 S1-2 S1-3 S1-4 S1-5 COMMENTS

A0000 ON ON OFF OFF OFF Normally used for VGA Cards

A8000 OFF ON OFF ON OFF Normally used for VGA Cards

B0000 ON OFF OFF ON OFF Normally used for VGA Cards

B8000 OFF OFF OFF ON OFF Normally used for VGA Cards

C0000 ON ON ON OFF OFF Normally used for VGA Cards

C8000 OFF ON ON OFF OFF

D0000 ON OFF ON OFF OFF Default Setting for DCB

D8000 OFF OFF ON OFF OFF

E0000 ON ON OFF OFF OFF

E8000 OFF ON OFF OFF OFF

NOTE: If the address is changed, care must be taken to select an address range which is not being

used by another device. The most significant bit of the address is controlled by switch position S15.

Lumisys supplies a utility program, FINDMEM, which can be used to identify potential open address

locations in the range A0000-EFFFF. FINDMEM has the following output format:

C:\LSDT\TOOLS>FINDMEM

A000:0000 --USED-- A000:0000 = 20

A800:0000 --USED-- A800:0000 = 20

B000:0000 --USED-- B000:0000 = 4D

B800:0000 --USED-- B800:0000 = 20

C000:0000 --USED-- C000:0000 = 55

C800:0000 --USED-- C800:0000 = 4D

D000:0000 **FREE**

D800:0000 --USED-- D800:0000 = 5A

E000:0000 --USED-- E000:0000 = B4

E800:0000 --USED-- E800:0000 = 41