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Smooth Screen Scrolling RoutineHi everyone, this is a follow up to the thread on smooth screen scrolling. As promised here is the code for the routine. It's pretty long and fairl…
... br />
Basically the routine works by redrawing the tiles ... the scroll position and call the routine. An increase of 1 ... pixels.
The routine is designed to detect blank ...
* This routine shifts tiles into 4 positions ... -
So you want to make a cardgame......but you haven't got a good deck to display. Well here is a fully relocatable routine that will do the job for you. Place the code anywhere in me…
... here is a fully relocatable routine that will do the ...
Some ways to call the routine:
LET A$="QH": PRINT ... CP 23
RET NC ; test on out of screen
machine code player routineHi all, Collecting all my courage to ask more (rather stupid attitude from me, but so difficult to ask questions and bother other people, don't unde…
... . SoundFX uses 23760 to call a routine and 23760 is old method ... need similar kind of playing routine ie. saved to first REM ... address XXXXX,
calls playing routine (without saving) to output the ... or how to do the routine itself.
Any ...Asm routine for AY playback?Hi, is possible to create and "name" an asm routine for playing some ay data? If yes, how? Example: Ok , I've finished a sound tracker song, now I n…
... create and "name" an asm routine for playing some ay data ... with or without the play routine? How does it work?
Is possible to call the routine and make it play some ...that "listing variables during runtime" thingWell, I did eventually finish this, but with my meds playing up I don't have much time each day that I can spend at the computer, so it's taken rathe…
... use IM1 and BREAK to call the routine, and then I also ... - BREAK into program) was pressed, call SaveSCR to save the screen ... entry points for this routine:
PRINTRO:;test from BASIC (otherwise this ... by the setup routine; that is, commands such as CALL & ...Random Numbers, USR Return Values & Timing BASICI've been trying out Jon Ritman's random number routine, published in Your Sinclair Aug'87. Apart from a timing comparison I also did a frequency ana…
... br /> LD bc,(SEED)
call $2d2b ;STACK_BC stack the number ... thus ensuring that the USR call returns the required decimal fraction ... to return from a USR call with a floating point number ... 1+INT (RND*50): REM test routine here
9995 NEXT a ...I live and learnThanks to Einar's ZXDB link I found under the Books folder and English sub directory a PDF file named 'The Century Computer Programming Course for Z…
Thanks to Einar's ZXDB link I found under the Books folder and English sub directory a PDF file named 'The Century Computer Programming Course for ZX81 and Spectrum Basic'. I must have half a dozen Basic lesson books but it always helps to add more since ...Machine Code ChallengeHere's a challenge for all you Z80 programmers. Points to be awarded for elegance and brevity. (I haven't got the solution either) HL addresses the …
... they are there when you test it.
Not all results ... there is no need to test more than two bytes, I ... POKE the test values into 16384 and 16385 ... top of the screen, call the routine located at 32768 and then ...Sprite adviceHello. So, I'm slowly getting to grips with Z80 assembly - currently equal parts frustration and enjoyment. Now looking for some advice to help shift…
... keys
bit 0,a ;test space
jp z,testfire ... ;z=pressed, then test if fire already pressed
call newbullet ;call newbullet routine
right rest ...Rst #38This, as far as I know, is the ROM procedure that does the keyboard check. (and, at the same time, is what's being executed by interrupt in IM 1 mode…
... FRAMES1.
LD A,H ; Test if the result was zero ... /> PUSH DE ;
CALL L02BF ; Routine KEYBOARD executes a stage in ...Cross Platform DevelopmentWhat's the best way to develop cross platform apps? By best, the only limiting criteria would be "at no cost" :)
... as flashing attributes and a test routine) - with no optimisation, is less ... fear is that the library routine may be implemented in C ... routines; there are even special call linkages for assembler routines that ... or 3 bytes per library call. Doesn't sound like a ...Assembler snippetsI was just thinking that a thread for small but useful assembler snippets to do useful things would be cool for people learning z80 coding. Not to me…
... routine ... CALL test
LD C,60 ; test seconds
CALL test
CALL test ; test ...FN nesting error?While playing with FN functions that call assembly, I've found something weird. Check out this code: [code]10 DEF FN f(a,b)=a+b 20 PRINT FN f(FN f(…
... test A ( will be zero if string '$' - '$' )
CALL Z,L28AB ; routine ...
CALL L24FB ; routine SCANNING evaluates expression ...
CALL L24FB ; routine SCANNING evaluates expression ...FN nesting error?While playing with FN functions that call assembly, I've found something weird. Check out this code: [code]10 DEF FN f(a,b)=a+b 20 PRINT FN f(FN f(…
... (the SCANNING routine). Instead, it has to call to address 386Eh ... ; test A ( will be zero if string '$' - '$' )
CALL Z,L28AB ; routine ... in CH_ADD
CALL L28AB ; routine FN-SKPOVR advances HL past ...Is there a ROM modification (48K) for load without typing LOAD""?The target is to play with 48K machines with keyboard broken, or an alternative solution for new clones like Superfo instead of making a new keyboard…
... reference.
CALL L1C8C ; routine EXPT-EXP checks that a ... T_ADDR.
AND A ; test for zero - SAVE.
... T_ADDR.
AND A ; test for zero - SAVE.
...Need to scroll one column using m.c.I've used many of the available routines to scroll the entire screen in any direction, but I'm not being able to find one that would allow me to scro…
... h,24" before the second "call SHIFT" so that both calls ... . I'll include my little test routine with the coloured columns, so ...Trailblazer - mapped?Anyone mapped Trailblazer yet? I'd kind of like to get hold of the maps. D.
... zone is called Terry's Test.
There's also ... /> + end of dump loop, call DUMPS routine, pattern IDs >=$AE not ...Bug in Super Wonder Boy in Monsterland?Hello!:smile: This game seems to have a bug that prevents finalize. The dragon that is in the last level, it is impossible to kill.Remains static.No…
... , apart from moving the fireball routine specifically into round 11.
test - the only other nice to ... /> But if I use call cleartable routine, my hero IS DISAPPEAR after ... I just updated Bandit's routine to check what the current ...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... on
and a ; test for zero
ret nz ... br />
; THE 'CALL' COMMAND ROUTINE ; 17 bytes
org ... /> call find_int2 ; get address
ld a, c ; test
call sexpt1num ; test for final number
...Horizontal scrollDoes anyone know how to do a 2 or 4 pixel left or right horizontal scroll of the spectrum screen. I can make a 1 one pixel scroll with: ... rl (hl…
... )/dec hl ...
and call this routine 2 or 4 times. But ...A few questions about machine codeOh no... another noob. I'm giving my first steps in assembler (finally, after 20 years stuck in BASIC). I read a SU article explaining that if I wan…
... that if I want to call $0556 I have to set ... use 'SCF' every time I call $0556, or is it o ...
ld de,6912
call 1366
ld a,255 ...
ld de,22564
call 1366
jp 30285[/CODE ... use certain registers if I call a routine from the spectrum rom ...Summer express game competetionHello to all. I would like announce SUMMER EXPRESS GAME COMPETETION: [B]Theme:[/B] a game [B]Deadline:[/B] 1st September 2010 [B]Target:[/B] ZX Spe…
... ). That means you can call tape routine in rom from machine code ... but you can't call your ... own routine somewhere in ram.
quick - Zx80 ASM questionWhile I am ploughing through lots of ASM listings, one of my earlier adaptation attempts surprised me [B][asm code][/B] [code] org 32768 start: ld…
... with text1 data
call printtext ; call printline routine
ld hl,text2 ... with text2 data
call printtext ; call printline routine
ret[/b]
printtext: ; routine to print out ...Getting the contents of tablesHi All, I'm risking a potentially daft question here as it seems pretty fundamental but here goes: What's the best way of pointing register pairs a…
... tile data and want to call a routine with hl pointing at ...Help needed with a loop counterVariable W counts to 12 then calls a subroutine to move a character, it then resets to zero and starts again. For every 2 moves of that character I …
... that character I want to call another routine, but dont want to ... /> I now want to call another routine the frequency based on the ...Difficult to find upper RAM fault.I've recently repaired an issue 3B 48K Spectrum that had a tricky to diagnose upper RAM fault, so I thought I'd post a report of what I found here. …
... FILL routine). Because the second DEC (HL) instruction of this test ... logic analyser showed the memory test successfully went a good ... to capture the RAM-FILL routine passing from lower RAM ... written a little machine language test routine and perhaps that would ...Using CP and JR Z commandI have been trying to [URL="http://www.worldofspectrum.org/forums/showthread.php?t=40011"]convert a BASIC routine to machine code[/URL], but to no av…
... ?t=40011"]convert a BASIC routine to machine code[/URL], but ... 61 then I want to call a routine, what JR command do ...MC LPRINT 23681Having problems with this routine to print large on the screen using LPRINT, it works ok in BASIC, but cant seem to get it to loop for some reason in…
Having problems with this routine to print large on the ... />
[CODE]org 32000
call cols ;fill attributes
ld ...
push bc
call print ;call print routine
pop bc
call 5633 ;open channel
ld ...Help needed with a bit of code...My minds gone blank again I'm afraid, I'm having trouble with this routine that loads variables into memory then calls the corresponding routine. Th…
... m having trouble with this routine that loads variables into memory ... then calls the corresponding routine.
Theres 3 ... bc
caller
call 56003 ;routine to be called
pop ... 12,14,6 ;variables for routine 3 bytes prior to start ...
