flat assembler - Converting asm program

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MajorDill

Joined: 01 Nov 2010
Posts: 22

MajorDill 10 Jul 2014, 20:48

I am converting a program from another assembler and ran into this:

table db 'LIS', 'T' | 80h
dw (address of something)
db 'LOA', 'D' | 80h
dw (another address)
which turns on the left most bit in 'T' so in memory, it looks like this
L I S T
4C 49 53 D4 <--(instead of 54)

this allows you to rip thru a table using the turned on bit to signal the end of an alpha string

is there some way to do this in FASM?

10 Jul 2014, 20:48

cod3b453

Joined: 25 Aug 2004
Posts: 618

cod3b453 10 Jul 2014, 21:24

The following will do it but you'd need a struc and macro version to allow labeled/unlabeled strings.

Code:

struc str [x]
{
 common
        local .end

        db x
    .end:

        load b byte from .end-1
        b = b or 0x80
        store byte b at .end-1

}

table str 'tes','t'

10 Jul 2014, 21:24

l_inc

Joined: 23 Oct 2009
Posts: 881

l_inc 10 Jul 2014, 22:02

MajorDill
Just use the operator or instead of the pipe character:

Code:

table db 'LIS', 'T' or 80h

_________________
Faith is a superposition of knowledge and fallacy

10 Jul 2014, 22:02

shutdownall

Joined: 02 Apr 2010
Posts: 517
Location: Munich

shutdownall 10 Jul 2014, 23:44

This looks similar to Sinclair's ZX Basic structures. Cool

Code:

        DEFB    $31,$34,$26,$29+$80             ; LOAD
        DEFB    $31,$2E,$38,$39+$80             ; LIST
        DEFB    $31,$2A,$39+$80                 ; LET
        DEFB    $35,$26,$3A,$38,$2A+$80         ; PAUSE
        DEFB    $33,$2A,$3D,$39+$80             ; NEXT
        DEFB    $35,$34,$30,$2A+$80             ; POKE

For use in ASCII I would prefer

Code:

table:
db 'LIS','T'+$80
dw adr_list
db 'LOA','D'+$80
dw adr_load

10 Jul 2014, 23:44

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