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AST RESEARCH TECHNICAL BULLETIN TB-0033A 9-4-84
AST-5251 VER. 2.1 ADDRESSING
The AST-5251 package utilizes I/O address 300 to 30F. If another
peripheral board is using the same or part of this address range
it will be necessary to readdress the AST-5251.
To readdress AST-5251, the CC-432 board and AST5251.EXE must be
reconfigured.
Locate the switch bank (S1) on the CC-432 board. Switches one
and two select the I/O address range for the CC-432.
S1 Position Hexidecimal Application
1 2 I/O Addresses
ON ON 300-30F Prototype Card
OFF ON 320-32F Fixed Disk
ON OFF 340-34F Not Used
OFF OFF 360-36F Not Used
To patch AST5251.EXE it is first necessary to rename it in order
for DEBUG.COM to edit it. Type in the commands in boldface on a
disk that has DOS, DEBUG.COM, and AST5251.EXE on it.
A>REN AST5251.EXE AST5251.TST
A>
A>DEBUG AST5251.TST
-e300 (sp = spacebar)
sp sp sp sp sp sp sp
08FF:0300 0A. 04. 02.XX 03. 00.YY 03. 00.ZZ 03.
sp
08FF:0308 04. DD
-w
Writing A000 bytes
-q
A>
A>REN AST5251.TST AST5251.EXE
A>
(*) Where XX, YY, ZZ, and DD equal the values in table 2-1,
corresponding to the selected address (see below).
TABLE 2-1
I/O ADDRESS XX YY ZZ DD
300-30F 02 00 03 04
320-32F 22 20 23 24
340-34F 42 40 43 44
360-36F 62 60 63 64