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This forum is locked: you cannot post, reply to, or edit topics. Z80 & 68k Assembly => z80 & ez80 Assembly
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JacobdeHaan


Member


Joined: 10 Jul 2003
Posts: 165

Posted: 14 Jul 2003 02:05:53 am    Post subject:

I've been having tons of fun with ASM in 28 days, but I just got stuck on the second excersice of day ten. I tried to do it, but failed miserably.
Quote:
Write a program that will show which graphing mode is active, and allows the user to change it. Use these keys:

[1] Function
[2] Polar
[3] Parametric
[4] Sequence

This is what I tried

Code:
.nolist
#define   end   .end
#define   END   .end
#define   equ   .equ
#define   EQU   .equ
#include   "include/ti83plus.inc"
.list
.org   9D95h
   bcall(_runindicoff)
   bcall(_clrlcdfull)
   ld   hl,0
   ld   (currow),hl
   
graph:
   bit   grffuncm,(iy+grfmodeflags)
   jr   nz,function
   bit   grfpolarm,(iy+grfmodeflags)
   jr   nz,polar
   bit   grfparamm,(iy+grfmodeflags)
   jr   nz,param
   ld   hl,sequence
   bcall(_puts)
   jr   getkey
   
getkey:
   bcall(_getkey)
   cp   kclear
   jr   z,quit
   cp   k1
   jr   z,setfun
   cp   k2
   jr   z,setpol
   cp   k3
   jr   z,setpar
   jr   setseq

quit:
   ret
  
setfun:
   set   grffuncm,(iy+grfmodeflags)
   jr   graph

setpol:
   set   grfpolarm,(iy+grfmodeflags)
   jr   graph
   
setpar:
   set   grfparamm,(iy+grfmodeflags)
   jr   graph
   
setseq:
   set   grfrecurm,(iy+grfmodeflags)
   jr   graph
  
function:   ld   hl,func
  bcall(_puts)
  jr   getkey
  
polar:  ld   hl,pol
  bcall(_puts)
  jr   getkey
  
param:  ld   hl,par
  bcall(_puts)
  jr   getkey

par:  .db   "parametric      ",0

pol:  .db   "polar           ",0

func:  .db   "function        ",0
   
sequence:   .db   "sequence        ",0

.end
.end

The tutorial said that you use the set and res commands to set system flags, but they didn't work for me. I looked at the answer to the excersice, and he didn't even use those commands to do the program. Confused His went like this to set the mode:

Code:
set_func:
   ld   (iy+GrfModeFlags),%00010000
   jr   DispCurMode
set_polar:
   ld   (iy+GrfModeFlags),%00100000
   jr   DispCurMode
set_param:
   ld   (iy+GrfModeFlags),%01000000
   jr   DispCurMode
set_recur:
   ld   (iy+GrfModeFlags),%10000000
   jr   DispCurMode

I re-read the tutorial, and I coulnd't figure out why he did this.
In conclusion, how do you know what to store into (iy+grfmodeflags) to set that flag, or any other flag. (the binary doesn't make any sense to me)
Also, if you aren't supposed to use the set/res commands in this program, when do you use them?
This seems to be a simple question compared to all the others on this board, so I bet the answer to this is really simple.
Thanks in advance for any help.
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NETWizz
Byte by bit


Bandwidth Hog


Joined: 20 May 2003
Posts: 2369

Posted: 14 Jul 2003 04:07:55 am    Post subject:

Fellow Programmers,

To practice flags, there is nothing better than enabling both Horiz, and G-T split modes at the same time.
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Adm.Wiggin
aka Tianon


Know-It-All


Joined: 02 Jun 2003
Posts: 1874

Posted: 14 Jul 2003 11:23:49 am    Post subject:

ok, 'bout the binary... u have the bit number of the flag right?
here is the binary (under is the bit countoff) :
%10101010
%76543210

make sense?
so set 5,(IY + 100)
would be the same as
ld (IY + 100),%00100000

get it?

EDIT

Whoa Jbirk! Scary but cool!


Last edited by Guest on 14 Jul 2003 12:37:27 pm; edited 1 time in total
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JacobdeHaan


Member


Joined: 10 Jul 2003
Posts: 165

Posted: 14 Jul 2003 10:43:23 pm    Post subject:

Thanks, I understand Laughing , I knew you guys would know the answer.
So about the set 5,(IY + 100) and ld (IY + 100),%00100000, which one is faster and smaller, or are they essentially the same thing as far as the calculator is concerned?
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Adm.Wiggin
aka Tianon


Know-It-All


Joined: 02 Jun 2003
Posts: 1874

Posted: 14 Jul 2003 10:47:39 pm    Post subject:

they are ESSENCIALLY the same thing... but i dunno, ive never used the ld one
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JacobdeHaan


Member


Joined: 10 Jul 2003
Posts: 165

Posted: 14 Jul 2003 10:49:26 pm    Post subject:

Ok, now that I "understand" flags, I'm wondering what you would use Asm_Flag1, 2, and 3 for. Like what would be a good example of their use?
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Adm.Wiggin
aka Tianon


Know-It-All


Joined: 02 Jun 2003
Posts: 1874

Posted: 14 Jul 2003 10:56:02 pm    Post subject:

well, as temp vars they would be good... MirageOS uses them...
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JacobdeHaan


Member


Joined: 10 Jul 2003
Posts: 165

Posted: 14 Jul 2003 11:21:30 pm    Post subject:

Alright, I give 'em a try.
Thanks yall for the quick and easy responses. Very Happy
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CoBB


Active Member


Joined: 30 Jun 2003
Posts: 720

Posted: 15 Jul 2003 01:13:16 am    Post subject:

JacobdeHaan wrote:
Thanks, I understand  Laughing , I knew you guys would know the answer.
So about the set 5,(IY + 100) and ld (IY + 100),%00100000, which one is faster and smaller, or are they essentially the same thing as far as the calculator is concerned?

I'd like to refute Adm. Wiggin's statement: they aren't essentially the same.

set 5,blabla sets bit 5 of blabla and leaves other bits intact.
ld blabla,%00100000 obviously adjusts all the bits at once.

Set/res/bit is slower than ld/and/or/xor, but they allow you to manipulate single bits of various registers and memory locations without having to corrupt the accumulator. You should never use them with the A register though, that's a waste of speed.

Example: set 5,a should be replaced with or %00100000. However, set 5,b could be substituted with push af \ ld a,b \ or %00100000 \ ld b,a \ pop af. Even if you don't need to retain the value of A and leave out the push-pop, set is still better.
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NETWizz
Byte by bit


Bandwidth Hog


Joined: 20 May 2003
Posts: 2369

Posted: 15 Jul 2003 01:16:08 am    Post subject:

Adm.Wiggin wrote:
ok, 'bout the binary...  u have the bit number of the flag right?
here is the binary (under is the bit countoff) :
%10101010
%76543210

make sense?
so set 5,(IY + 100)
would be the same as
ld (IY + 100),%00100000

get it?

EDIT

Whoa Jbirk!  Scary but cool!

They are not at all the same!

ld (iy+100),%00100000

The above sets a bit, but also resets (changes to 0) every other bit on the entire byte

set 5,(iy + 100) sets bit 5 but does not touce any other bit.

Now that I have meantioned this, I should probably note that there is no opcode to do the ld (IY+100),# instrution.

You need to use the accumulator when writing to ram.

e.g. ld a,#
ld (IY+100),a

get it?
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NETWizz
Byte by bit


Bandwidth Hog


Joined: 20 May 2003
Posts: 2369

Posted: 15 Jul 2003 01:17:29 am    Post subject:

CoBB wrote:
JacobdeHaan wrote:
Thanks, I understand  Laughing , I knew you guys would know the answer.
So about the set 5,(IY + 100) and ld (IY + 100),%00100000, which one is faster and smaller, or are they essentially the same thing as far as the calculator is concerned?

I'd like to refute Adm. Wiggin's statement: they aren't essentially the same.

set 5,blabla sets bit 5 of blabla and leaves other bits intact.
ld blabla,%00100000 obviously adjusts all the bits at once.

Set/res/bit is slower than ld/and/or/xor, but they allow you to manipulate single bits of various registers and memory locations without having to corrupt the accumulator. You should never use them with the A register though, that's a waste of speed.

Example: set 5,a should be replaced with or %00100000. However, set 5,b could be substituted with push af \ ld a,b \ or %00100000 \ ld b,a \ pop af. Even if you don't need to retain the value of A and leave out the push-pop, set is still better.

dammit cobb, you beat me to the punch by 3 minutes. Very Happy
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JacobdeHaan


Member


Joined: 10 Jul 2003
Posts: 165

Posted: 15 Jul 2003 01:57:45 am    Post subject:

Lol!
Anyways, I think I know what you are talking about. I just did the next tutorial on bitwise instructions, and it shed a bit of light on the situation. Thanks!
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Adm.Wiggin
aka Tianon


Know-It-All


Joined: 02 Jun 2003
Posts: 1874

Posted: 15 Jul 2003 12:14:32 pm    Post subject:

yes, i was wondering about that as well... i guess ur right!
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JacobdeHaan


Member


Joined: 10 Jul 2003
Posts: 165

Posted: 15 Jul 2003 08:34:55 pm    Post subject:

Well, I believe proof that I somewhat understand what I'm doing is that I tried Jbirk's suggestion, and it worked.
Btw, very cool, with the screen split up into 3 parts.
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Adm.Wiggin
aka Tianon


Know-It-All


Joined: 02 Jun 2003
Posts: 1874

Posted: 16 Jul 2003 12:20:36 pm    Post subject:

yes, did it scare u as much as it did me? i was like, "Oh no, that cant be good", but then i typed something and realized, that is what it is supposed to do!
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JacobdeHaan


Member


Joined: 10 Jul 2003
Posts: 165

Posted: 17 Jul 2003 01:19:03 am    Post subject:

Ya, I think I was kinda afraid there for a few seconds, but I also was "stupid" enough to try Jbirks Evil Mad App, so I know he'll do enough to scare you, but not kill your calculator. Very Happy
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Adm.Wiggin
aka Tianon


Know-It-All


Joined: 02 Jun 2003
Posts: 1874

Posted: 17 Jul 2003 11:31:46 am    Post subject:

i did BOTH on an emu Smile

Last edited by Guest on 17 Jul 2003 11:31:53 am; edited 1 time in total
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