>
>         movlw   ISA_HBASEIO
>         movwf   ISA_HADR

#define ISA_HBASEIO <something>
#define ISA_LBASEIO <something>

unsigned char ISA_HADR;
unsigned char ISA_LADR;
unsigned char ISA_OFFSET;

ISA_HADR = ISA_HBASEIO;

>         movf    ISA_OFFSET, W
>         addlw   ISA_LBASEIO
>         movwf   ISA_LADR

ISA_LADR = ISA_LBASIO + ISA_OFFSET;

>         ; parse address
>
>         movf    ISA_LADR, W
>         andlw   0x3F
>         movwf   PORTC

PORTC = ISA_LADR & 0x3F;

>         rrf     ISA_LADR, F
>         rrf     ISA_LADR, W
>         andlw   0x30
>         movwf   ISA_LADR

ISA_LADR = (ISA_LADR >> 2) & 0x30;

>         swapf   ISA_HADR, F
>         rlf     ISA_HADR, F
>         rlf     ISA_HADR, W
>         andlw   0xC0
>         movwf   ISA_HADR

ISA_HADR = (ISA_HADR << 6) & 0xC0;

>         movlw   0x0F
>         addwf   ISA_LADR, W
>         addwf   ISA_HADR, W
>         movwf   PORTB

PORTB = ISA_LADR + ISA_HADR + 0x0F;

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