It's part of picnic project (http://picnic.sf.net) - in the file
webpic.asm

    This code receives an ISA_OFFSET to address an register inside an
ISA board that is connected to the pic.
    ISA_HBASEIO and ISA_LBASEIO are the 2 bytes that makes the fixed
adresses of the board, such as 0x300 or 0x280.

Rafael.

Liam O'Hagan wrote:

>What is it meant to do?
>
>-----Original Message-----
>From: pic microcontroller discussion list [mailto:PICLIST@MITVMA.MIT.EDU] On
>Behalf Of Rafael Vidal Aroca
>Sent: Tuesday, 25 May 2004 1:12 PM
>To: PICLIST@MITVMA.MIT.EDU
>Subject: [PIC:] Conversion ASM -> CCS C
>
>
>    Hello guys,
>    i'm having trouble converting this asm code that runs on a pic 16F877 to
>CCS C. I tried to convert it, but it did not work :(
>
>    I'd be really thankful if anyone could translate this code into C so
>that i can compare with what i did.
>
>        movlw   ISA_HBASEIO
>        movwf   ISA_HADR
>
>        movf    ISA_OFFSET, W
>        addlw   ISA_LBASEIO
>        movwf   ISA_LADR
>
>        ; parse address
>
>        movf    ISA_LADR, W
>        andlw   0x3F
>        movwf   PORTC
>
>        rrf     ISA_LADR, F
>        rrf     ISA_LADR, W
>        andlw   0x30
>        movwf   ISA_LADR
>
>        swapf   ISA_HADR, F
>        rlf     ISA_HADR, F
>        rlf     ISA_HADR, W
>        andlw   0xC0
>        movwf   ISA_HADR
>
>        movlw   0x0F
>        addwf   ISA_LADR, W
>        addwf   ISA_HADR, W
>        movwf   PORTB
>
>
>    again, thanks a lot for the attention.
>
>Rafael.
>
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