OpenEuphoria

Re: Rob: questions

• Posted by Pete Eberlein <xseal at HARBORSIDE.COM> Mar 15, 1999
• 605 views

Rob writes:
> low_buff = allocate_low(100)
>
> reg_list[REG_DS] = floor(low_buff / 16)           -- segment
> reg_list[REG_SI] = remainder(low_buff, 16)    --
> offset...dos_interrupt(....)

Ohhhh, yeah.... seeing this completely disagrees with the code I posted
earlier today, I think I had better revise the alloc_low function.

function alloc_low(atom amount)
-- allocates some amount of low memory and returns { segment, offset }
  atom lmem
  lmem = allocate_low(amount)
  return { floor(lmem / #10), and_bits(lmem, #F) }
end function

Segments are aligned on 16-byte boundaries, not 64k... even though a
segment can address a total of 64k bytes.

Sorry about the stupid mistake.. wonder where my brain went on that one..
I really hope I don't do stuff like this on upcoming finals.

Later,
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xseal at harborside.com  ICQ:13466657
http://www.harborside.com/home/x/xseal/euphoria/