OpenEuphoria

Re: Euphoria on DOSbox

• Posted by Robert Craig <rds at RapidEuphori?.c?m> Oct 30, 2007
• 792 views

CChris wrote:
> Really?
> The code in be_machine.c has some interrupt #31 calls which are specific to
> Causeway according to RBIL v61:
> * long_to_short(): AX=#FF21 (GetMemDOS) and #FF01 (RM interrupt)
> * InitGraphics(): AX=#FF08 (GetSelDet32)
> * user_allocate_low(): AX=#FF21
> * user_free_low: AX=#FF23 (RelMemDOS)
> * dos_interrupt: AX=#FF01
> 
> So... I expect these areas of the backend source will require some alternative
> variant selected by an #ifdef ... #else directive.

Thanks for spotting those calls. They are specialized bits
of code you would probably have to change to 
achieve 100% compatibility, but I think the bulk of 
Euphoria for DOS should work OK without any source code changes. 
For instance, Bernie recently said he got pmodew working:

   http://www.openeuphoria.org/EUforum/m17215.html

I switched over to the Causeway DOS extender,
from DOS4GW, more than a decade ago.
I compared against a couple of other DOS extenders at that time.
I recall that things pretty much worked immediately, 
without any source changes, whichever extender I used.
Though, as you observe, I did eventually code a few
Causeway-specific calls to support some tricky stuff,
such as the Euphoria dos_interrupt() library routine etc.

Regards,
   Rob Craig
   Rapid Deployment Software
   http://www.RapidEuphoria.com