Re: How does the Applesoft INT (vs. FP) command work?

[dog_cow@macgui.com (D Finnigan)]

D Finnigan wrote:
> Steve Nickolas wrote:
>> On Sun, 22 Jan 2012, MdntTrain wrote:
>> 
>>>
>>> Hi, folks.
>>>
>>>  On a II+, if INTBASIC is loaded into the Language Card ram (LCr), I
>>> know *what* the INT command does -- it switches from Applesoft in ROM
>>> to the BASIC in the LCr ..  but does anyone know exactly what steps
>>> occur when INT is run?
>>>
>>>  At some point, INT must activate the LCr bank, which would then
>>> immediately make Applesoft (thus presumably the rest of the INT
>>> command code) disappear.. so I does INT set up something like a page 3
>>> route to do the bank switch, then start intbasic at E000?
>>>
>>>  Thank you for any explanations-
>>> -John
>>>
>> 
>> FP and INT are part of DOS, not BASIC.  And these are located in DOS 
>> space.
>> 
> 
> See also the DOS 3.3 User's Manual (or, Do's and Dont's of DOS).
> 
> One of the appendices has some coverage of the INT and FP commands.
>

Well, I checked the DOS 3.3 and 3.2 manuals myself last evening, and the
explanation likely isn't as technical as you would need. It describes the
search process when looking for an image of Applesoft or Integer BASIC
(either on disk or in firmware) to load, but not in great detail.