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Tyraniek
Member
Joined: 07 Jun 2003
Posts: 133
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 Posted: 22 Jun 2003 02:35:07 pm Post subject: |
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Could you explain me what is said in the 40th lesson of AsmGuru ?
I'd like to write and then read in a program in order to save a highscore.
But what's the role of the variable "_ASM_IND_CALL" ?
What is PGMIO_EXEC (or maybe PRGMIO_EXEC) ? Is it a subroutine that someone has written ? Or is it a B_CALL ?
What does that mean :
Code:
B_CALL(_convop1) ; OP1 is in a
ld a, e ; but then, e is in a ??!!!
??????? Isn't it an error ? Or maybe a part of OP1 is in HL ???
I've never understood what does "_chkfindsym"
Then why do we substract the start of the program at the label ??? highscore-$9d95
I really hope you will be able to answer all these difficult questions !
thx ! |
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Adm.Wiggin
aka Tianon
Know-It-All
Joined: 02 Jun 2003
Posts: 1874
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| Posted: 23 Jun 2003 12:05:27 pm Post subject: |
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| well, first of all, ur using ASMGuru, which is for the TI-83... the latest version (almost final) of 83pa28d tells how to use SMC (self modifying code)... it could be helpful to you. |
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Tyraniek
Member
Joined: 07 Jun 2003
Posts: 133
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| Posted: 23 Jun 2003 01:31:27 pm Post subject: |
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| Thx, I had another version of these files. |
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Adm.Wiggin
aka Tianon
Know-It-All
Joined: 02 Jun 2003
Posts: 1874
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| Posted: 23 Jun 2003 01:32:23 pm Post subject: |
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| glad i could help! u should check ticalc.org at least once every few days for new/updated files |
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Tyraniek
Member
Joined: 07 Jun 2003
Posts: 133
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| Posted: 23 Jun 2003 01:33:59 pm Post subject: |
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What's more, they explain how to do a fade out !!!!
maybe another version of TLIB will appear one day  (as the first I made was also my first asm prgm) |
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Adm.Wiggin
aka Tianon
Know-It-All
Joined: 02 Jun 2003
Posts: 1874
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| Posted: 23 Jun 2003 01:37:55 pm Post subject: |
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| well, good luck if u try to do another one! does ur new read/write work? |
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Tyraniek
Member
Joined: 07 Jun 2003
Posts: 133
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| Posted: 24 Jun 2003 12:09:11 am Post subject: |
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I haven't tried yet ! I'm going to pass an exam this morning (the baccalaureate).
I'll be in holydays at 12h00 !!! Then, I'll be able to work on my program |
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Adm.Wiggin
aka Tianon
Know-It-All
Joined: 02 Jun 2003
Posts: 1874
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| Posted: 24 Jun 2003 11:11:01 am Post subject: |
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| well, cool! tell us how it works out! |
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Tyraniek
Member
Joined: 07 Jun 2003
Posts: 133
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| Posted: 24 Jun 2003 12:36:30 pm Post subject: |
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my baccalaureat ? wasn't too bad (in fact, it was just an oral ; french oral as I'm french)
Concerning my program, I would now like to know what do you think of that :
Code:
#include "ASM.inc"
#define score 8268h
.org 9d95h
RST 18h ; What does EXACTLY this instruction ?
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; 1° : Add a value to HL (here, this value is score);;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
ld hl, (hscore)
ld a, 100 ; do not take care of that;-)
ld (score), a ; I just prepare it to use it with my prgm
ld a, (score) ; in which score = 8268h is the player's score
ld e, a
ld d, 0
add hl, de ; HL += 100
ld (hscore), hl ; now, we add
B_CALL(_DispHL) ; and we display
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; I don't understand these instructions (I don't understand RST 18h neither);;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
B_CALL(_PopRealO1) ;Retrieve OP1 for writeback
B_CALL(_ChkFindSym)
;Find data location as offset from start of program.
LD HL,data - $9D95 + 4 ; Alright, I understand it but that means
; we HAVE TO use AsmComp(prgmSRC,prgmDEST) before useing it ???
;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; COMPLETELY LOST !!!!!!;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;
ADD HL,DE ; why do we add DE again ?
EX DE,HL ; don't understand why we exhange values
LD HL,data ; why data and not hscore ?
LD BC,2 ; copy the 2 bytes of DATA
LDIR ; to hscore ( = HL = DE because exchanged)
RET
data:
hscore: .db 0000
.end
END
And now, I've got "helluva" lot of questions 
- Is it an obligation to use 16-bits registers like HL and DE ? Is it possible to use b, a or c ?
- Does hscore have to be a DW or can it also a db ?
- When I ldir, is it possible to put BC=1 if I've got a db ? If so, what's faster than ldir ? LD ? EX ?
- What the hell is RST 18h ? I've seen it with B_CALL (I think), so I don't think it just saves OP1...
- Why do we add DE 2 times ????
- What does PopReal1 ? What does ChkFindSym ?
Thx very much ! |
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JacobdeHaan
Member
Joined: 10 Jul 2003
Posts: 165
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| Posted: 11 Jul 2003 12:09:13 am Post subject: |
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Adm.Wiggin wrote: the latest version (almost final) of 83pa28d tells how to use SMC (self modifying code)... it could be helpful to you.
This must be a really stupid question, but I think I have the latest version of 83pa28d, yet I can't find anything about SMC, could you tell me what day it is supposed to be on? |
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Tyraniek
Member
Joined: 07 Jun 2003
Posts: 133
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| Posted: 11 Jul 2003 12:44:20 am Post subject: |
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day 24
"program control"
SMC |
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JacobdeHaan
Member
Joined: 10 Jul 2003
Posts: 165
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| Posted: 11 Jul 2003 01:29:30 am Post subject: |
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Ok, I think I got it now, thanks.  |
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Z80 & 68k Assembly => z80 & ez80 Assembly
