OpenEuphoria

2. Re: Segment off-sets of sequences

• Posted by Jacques Deschenes <desja at QUEBECTEL.COM> Jan 18, 1997
• 1464 views

At 01:30 18-01-97 +0000, you wrote:
>---------------------- Information from the mail header -----------------------
>Sender:       Euphoria Programming for MS-DOS <EUPHORIA at
>MIAMIU.ACS.MUOHIO.EDU>
>Poster:       Greg Harris <blackdog at MAIL.CDC.NET>
>Subject:      Segment off-sets of sequences
>-------------------------------------------------------------------------------
>
>Hello all. I have a technical question. I am preparing some routines
>which use dos interrupts. The routine in question need to know the
>seqment address and the segment offset of a sequence that has been
>poked into low mem. Here is a portion of the code.
>
>global function get_block (sequence buffer, integer port)
>integer getblock,bufferaddress
>-- allocate buffer space in mem
>bufferaddress = allocate_low(len(buffer))
>-- poke the buffer
>for i = 0 to (len(buffer) -1)  do
>poke(bufferaddress+i, buffer[i+1])
>end for
>regs=repeat(0,10)
>regs[REG_AX] = #1800
>regs[REG_CX] = len(buffer)
>regs[REG_DX] = port
>
>-- this should be the address of the of the seq. in mem ?
>
>regs[REG_ES] = bufferaddress -- this should be the start of the
>
>-- I don't know this one..needs the segment off-set of the sequence
>-- in mem. Maybe should be 0 ?
>
>regs[REG_DI] = ?
>regs=dos_interrupt(#14, regs)
>getblock = regs(REG_AX)
>return getblock
>free_low(bufferaddress)
>end function
>
>I think that the segment address should be the address returned by
>the allocate_low() function and the segment offset should be 0.
>
>Can anybody help with this?
>
>Thanks..
>
>Greg.
>
  segment = floor(bufferaddress/16)
  offset = remainder(bufferaddress,16)

Jacques Deschenes
Baie-Comeau, Quebec
Canada
desja at quebectel.com