[A83] Re: Official H**s Replacement Commands (OT)

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[A83] Re: Official H**s Replacement Commands (OT)


This is unbelievable!

ld a,84
 call _putc
 ld a,73
 call _putc
 ld a,67
 call _putc
 ld a,84
 call _putc
 ld a,65
 call _putc
 ld a,67
 call _putc
 ld a,84
 call _putc
 ld a,79
 call _putc
 ld a,69
 call _putc

Now THIS is inefficient!
Let's give them the prize!

And look at this:

  push hl                ; push hl to stack...
  pop ix                 ; ...and pop it into iy

It's not totally right :-~

>I think we have a winner! Check this source code out! Unfortunately, I
think
>he actually meant this to be a real program...
>
>http://www.shiar.org/ticalcs/archives.php?download=tictacto
>
>-----Original Message-----
>From: assembly-83-bounce@lists.ticalc.org
>[mailto:assembly-83-bounce@lists.ticalc.org]On Behalf Of Thomas J.
>Hruska
>Sent: Thursday, July 05, 2001 10:30 AM
>To: assembly-83@lists.ticalc.org
>Subject: [A83] Re: Official H**s Replacement Commands (OT)
>
>
>
>At 07:17 PM 7/4/01 +0200, you wrote:
>
>Actually, there would be an excellent idea:  Modify the previously
>mentioned code to crash the calculator at random times (say 1% of the
>time...so you only have to look at 50 screen updates on average).
>
>>Can you also get *more* than the official labelling (with zero
>termination)?
>>It would be very, very, very nasty to load a large piece of the vat, and
>>cleared the whole lot.
>>
>>>To clarify a bit, what he's saying is that >> 8 and & 255 are used to get
>>the 8-bit pieces of a 16-bit address.  For example, when you do:
>>>  ld hl,plotsscreen
>>>What you're doing is equivalent to
>>>  ld h,plotsscreen >> 8   ;upper byte
>>>  ld l,plotsscreen & 255  ;lower byte
>>>
>>>Thus you can use >> 8 and & 255 to just get one piece of the address if
>you
>>don't want to do an entire 16-bit load.
>>>
>>>
>>>In a message dated Tue, 3 Jul 2001  3:35:01 PM Eastern Daylight Time,
>"Kirk
>>Meyer" <kirk.meyer@colorado.edu> writes:
>>>
>>><<
>>>>> 8 shifts right 8 (get upper byte)
>>>& 255 ands with 255 (get lower byte)
>>>
>>>In this code it's obviously a joke, but >> 8 is often used for optimizing
>>>tables by splitting them across 256 bytes.
>
>
>           Thomas J. Hruska -- shinelight@crosswinds.net
>Shining Light Productions -- "Meeting the needs of fellow programmers"
>                  http://www.shininglightpro.com/
>
>
>
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