Re: A86: Re: Questions about assembly programming

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Re: A86: Re: Questions about assembly programming

On Fri, 5 Sep 1997, Matthew Johnson wrote:

> asm and learn more about it, hopefully Dan Eble (the TI god), can help me
                                                   ^^^^^^^^^^
Please, I'm just a guy with a couple years' experience programming the 85.


> 
>     How do you display a register as a number? I suspect its a ROM call.
> 

You can display AHL as a decimal number with $4A33.


>    Do you ever need to swap RAM or is it automatic when using absolute
> addressing? Please explain in detail
>   how the memory works, that will help me a lot.

I don't know in detail how the memory works.  When you use rst 10, it
returns a 24-bit virtual address.  You can use the following routines to
manipulate these 24-bit addresses.

462F _TRANS_AHL_TO_PAGED_AND_SET_PAGE
4633 _TRANS_AHL_TO_PAGED
4637 _INC_AHL
463B _DEC_AHL
463F _INC_BDE
4643 _DEC_BDE

4633 takes a 24-bit address in AHL and returns the RAM page in A and the
physical address in HL.  462F does the same, but also sets the page for
you.

> 
>    How do you swap RAM and ROM pages?
> 

Ports 5 and 6.  Alan Bailey wrote up a port description (well, really he
just modified someone's 85 port description ;-))  I think you can find it
in the technical 86 directory at ticalc.org.


>    What are the uses for ipx and the other one (can't think of it right
> now).
> 

IPX?  The only IPX I know is a network protocol.


>    How can you use addressing on the calculator.  (i.e. indirect, direct,
> etc)
> 

1. ld c,4
2. ld d,e
3. ld a,(_curRow)
4. ld b,(hl)
5. ld h,(ix+7)
6. set 3,(iy+2)
7. out (5),a
8. in b,(c)

I think that covers all of them.  Did I miss any?


>     How can you do grayscale on the ti-86?
> 

Rapid buffer exchange.


>     How can floating point numbers be used?
> 

I've never used them.


--------
Dan Eble (mailto:eble@cis.ohio-state.edu)
         (http://www.cis.ohio-state.edu/~eble)
References: