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Animated attribute revealA new challenge to solve next. I would like to create an animated attribute reveal in machine code by having my 768 byte attributes held in ram whic…
... , which does a random block reveal using a 10-bit ... [/color]
LOOP10:
push bc
ld a,e ... br /> ld (de),a
pop de
ld ... ,DELAY2
SKIPDE: pop bc
dec bc
Animated attribute revealA new challenge to solve next. I would like to create an animated attribute reveal in machine code by having my 768 byte attributes held in ram whic…
... might be a bit too fast at present, but it ... jp FirstDE
LOOP10:
push bc
ld a,e ... gt;=$5b00)
push de
ex de,hl ... DONE1:
pop de
SKIPDE: pop bc
dec bc ...Tile routinesHi all, Please does anyone have any examples of tile routines in pure asm to set up maptile screens. I would like to try and understand them and ti…
... , I then push that address onto the stack, then pop it off ... the start of the attribute block
ld d, a ; load ...Tile routinesHi all, Please does anyone have any examples of tile routines in pure asm to set up maptile screens. I would like to try and understand them and ti…
... />
; ****************
push hl ; save the screen address ... br /> print_block: ; prints 8x8 block
ld a,(de) ; ...
; *****************
pop hl ; now get that screen ... Also, notice the PUSH HL and POP HL. This saves the ...Tile routinesHi all, Please does anyone have any examples of tile routines in pure asm to set up maptile screens. I would like to try and understand them and ti…
... file - don't try to copy it somewhere in the middle ... />
print_tile:
push bc ; temporarily store BC
djnz print_character
pop bc ; retrieve BC
call ...quick RAM copy using LET in BASICI'm in the process of reviewing, revising and refining all the programming tips & utility routines which I've posted on this forum over the last eigh…
... to integrate your "LDIR Basic fast copy RAM block" with my program...
CIRCLEHi, I'd like to draw a circle x,y,r using the BASIC-ROM subroutines. I've put x, y and r onto the calculator stack and used CALL #232D and RET. I g…
... 's a couple of fast circle routines on WoS ... once which was fairly fast but cheats and uses ... /> JR NC,DBCDOBRES
PUSH AF ; Save radius
... )
CALL STACKA
POP AF ; Restore radius
... as
it was fast enough for my purposes ...A new full-screen bicolor engine called NIRVANA[I]OK, there's something I need to clarify first: Nowadays if you write [B]"multicolor"[/B] everyone assumes it refers to "multicolor 8x1" (an attri…
... times in each identical LINREPT block (although it's only the ... />
I can probably just copy the Coup? versions of each ... the Coup? routines being too fast, as generally there'll be ...SCF/CCF flags - new discoveryI can't believe that no one is interested in discussing the additional, previously undocumented internal state of the Z80 CPU I have discovered recen…
... subroutines that act like "PUSH IFF2" and "POP IFF2":
[URL ... for the 6502 being a copy of the 6800 is a ...Double-Buffer ScreenFor my Alien Breed Speccy re-write I decided to use a Double Buffer (DB) or 'Back Screen' to draw all the game action onto, before shuffling the whol…
... a much quicker way to copy data. You use the ... of your data. Do POP to suck up data into ... want it to go, and PUSH all those registers (in ... bytes.
Remember POP moves the stack pointer minus ... a value from memory; PUSH moves the stack pointer plus ...I am currently playing......Don't know if there's been a thread like this, but I can't find one.... Having seen all the different threads asking people if they've played such a…
... couldn't find a physical copy anywhere and the Xbox360 version ... Every now and again a copy will turn up in a ... like it's the same copy that has changed hands a ... it's been around the block a few times.
fast enough (or at all to ...ScrollsHello. Ive been working in scroll routines and I want to show you them. First, one vertical 2 pixels scroll routine with 13 sprites [youtube]D-T3…
... screen isn't passing by fast enough to make a challenging ... scenic blocks. You store each block pre-shifted in 2-pixel ... (and I dont want to copy it (from Cobra for example ...Fuller AY only gamesThe definitive list: 1) Demonstration Tape 2) Bodysnatchas 3) Star Bike
... $0d6b
;load first block of code in at a ...
ld a,b
push bc
ld bc,$fffd ... )
out (c),a
pop bc
ret[/CODE]
Unusual custom turbo loaders - with sourcesI have always been fascinated by turbo loaders; my games all feature a TZX version with one of such schemes implemented, and I have been experimentin…
... Medium (not very fast), Fast (very fast) and Aaargh! (too fast, unpractical for real ...
SCF
PUSH AF
PUSH HL
LD A ... LD IX,65389
POP HL
POP AF
RET
POP HL
POP AF
RET
Unusual custom turbo loaders - with sourcesI have always been fascinated by turbo loaders; my games all feature a TZX version with one of such schemes implemented, and I have been experimentin…
... tone. It is not very fast - loads a headerless screen data ...
LD HL,01343
PUSH HL
IN A,(254 ...
LD C,A
PUSH AF
AND B
OUT (254),A
POP AF
SCF
RET ...Sorting BusinessThis is a little bit different from the usual game-related fare but I know there are a few people here who like this sort of thing. This is about so…
... . You cannot make a copy of the pivot element as ... large enough that making a copy is undesirable. I did ... do that by making a copy on the stack but ... -i)
pop de ; de = size
push hl ; save ...Drawing a dotted line...Hi Folks, I cannot be the first person to want this (?) so here goes! Does anyone have a MC routine that does the same as the BASIC DRAW command bu…
... br /> exx
push hl ;save H'L', ... />
DOTTED: ; copy of DRAW_LINE $24b7-$24fb
EXX
POP BC
PUSH BC
JR ...
PUSH DE
EXX
POP BC
Block RoutineHi Folks, I want to draw a block on the screen dependent on providing the X,Y,W,H values. I came up with the following: [CODE]100 LET l$=" …
... limit
a63057: PUSH BC
PUSH HL
LD B ... character
a63061: PUSH BC
PUSH HL
LD A ... /> a63068: LD (HL),A ;copy a zero into each byte ... /> pop hl ;HL=attribute address
rowloop:
push bc< ...Block RoutineHi Folks, I want to draw a block on the screen dependent on providing the X,Y,W,H values. I came up with the following: [CODE]100 LET l$=" …
Here's a much neater version of my previous post. Using IX for addressing the parameters simplifies the assembler code. The original routine needed all its parameters to be correct beforehand, as it was only doing a check on y, whereas all of x, y, x+w, y+ ...Creating a new game - AssemblySo... finally I?m studying Assembly Z80... after 36 years. :) Well... it?s sooooooooooooo hard to make a game using Assembly? I bought a book (Spectr…
... .
(1) Using PUSH and POP to copy data around in memory ...llvm-z80 statusFew months ago I read about efforts to produce llvm back-end for the Z80 (even perhaps as part of new z88dk). Any update on that? I found [URL="htt…
... br /> main:
push ix
push de
push bc
ld ... hl, 0
pop bc
pop de
pop ix
ret ... addressing modes, in particular a fast stack relative mode. Their ...Simple text scrolling routine...I'm having trouble writing a very simple text scroller, the idea is to use the ROM printer routine to print 32 characters each time the routine is ca…
... as otherwise it's too fast to read. (I think this ...
inc de
push bc
push de
ld bc ... S_POSN & DF_CC
pop de
pop bc
djnz loop ...Beautiful codeSome people see beauty or something sublime in maths formulas and equations, can anyone suggest examples of beautiful or sublime programming?
... /> COPY$1: AND A ;or CCF
RRA
PUSH AF
PUSH ... /> JR NC,COPY$2
DJNZ COPY$2
CALL COPY$ ;Copy token string ... (recursive call)
POP HL
POP ...BIFROST* ENGINE 1.2 released!Another improved version of the BIFROST* ENGINE is now available! Download it here: [url]http://www.worldofspectrum.org/infoseekid.cgi?id=0027405[/u…
... of BIFROST* on memory (one copy to display content from normal ... draw on shadow screen, another copy to do the opposite). Also ... refresh next 6 tiles
push bc
REPT 10
ENDR
pop bc
djnz loop
Creating a linked list in Z80[FONT=Calibri][SIZE=3]I am using a circular buffer to store tiles to be displayed on the screen. Tiles only appear for a set period of time, so when …
Making noises with the AYHow do you go about making noises from the AY chip in machine code? I'm wanting to make a pulsating humming noise that increases in volume as you ge…
...
; LD A,n (10 fast, 50 slow), use value between ... ,8 ; channel number
pulsevolloop PUSH BC
LD BC,65533 ... ; inc to next channel
POP BC
DJNZ pulsevolloop
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…
... times to copy three bytes from (HL) to (DE). PUSH everything you ... of your routine. When you POP those values again, DE and ... forget you can always PUSH DE and later POP the value into ...
