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BeepFX ProblemHi All, I'm currently trying to integrate the BeepFX engine in my 100% Assembler Game and it plays the sound fine, but then plays the sound again, a…
...
ld hl,0
SFXRTl0: push bc
push iy
pop bc
hl
add hl,bc
ex de,hl
pop bc
dec bc
ld ... -
Hooky - hook ZX ROM and rewire RST and NMI to RAM - rantThis is a rather long rant. Not for short tempered. :) The objective is to hook into RST "vectors" and NMI on a Spectrum without affecting the normal…
... HL ; HL=HL-1 (hl back to 0xffff)
0x11F0 EXX
0x11F1 LD (5CB4),BC ... initially)
0x1200 LD (5CB4),HL ; overwrite BC' with "real HL" (where mem test ... LD (HL),#0x3e ; write 3e there
0x1227 DEC HL ; hl=ff56
0x1228 LD SP,HL ... -
Screen buffer Tip from Raff CeccoRaff very kindly gave me this tip: "Incidentally, I remembered a trick I used on the Z80 for extra speed: When clearing the screen buffer, it was a…
... :
When clearing the screen buffer, it was actually much quicker ... to the end of the screen memory area and push zero ... onto the stack until the screen area was filled.
Other than using attributes what other ways to detect collisions, when using char based movement?So I'm slowly working out the bits and pieces to write a game completely in assembly. I've been using attributes when writing in BASIC to detect whet…
...
push bc
ld bc,32
LOOP:
add hl,bc
dec ... a
jr nz,LOOP
pop bc
add hl,bc ...
ld a,(hl) ; a now holds ...line routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code. The line routine that I have i…
... bc
ld (tempbc),BC
ld (temphl),HL
POP BC ;
STEP: LD HL,(COORDS ...line routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code. The line routine that I have i…
... guardar bc e hl
ld (tempbc),BC
ld (temphl),HL
POP BC
STEP: LD HL ...line routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code. The line routine that I have i…
... : bc = (y,x) coordinate of pixel
ex de,hl
pop bc ...
ld e,b ;guarda o ...line routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code. The line routine that I have i…
... /> ld hl,PtsTab
ld a,#80
lp_mpt1 ld (hl),a< ... /> and #1f
ld (hl),a
inc l< ... ld b,#c0
lp_mpt3 ld (hl),e
inc h
ld (hl ...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…
... /> lscrsp: di
ld (temp_sp),sp
ld sp,hl
ld sp,ScrAddr2+4608;512 ... /> ld c,16
lscrsp20:
pop hl
; adc hl,hl ;You ...16k/48k Sound FXI am now moving on from graphiocs to trying to build up a library of sound fx to be used with a 16k/48k Spectrum. Does anyone have any example m/cod…
...
noise ld e,250
ld hl,0
noise2 push ... ,32
noise0 push bc
ld a,(hl) ; next "random" number.
pop bc
djnz noise0
pop de
ld a,e ...Collision DetectionHi everyone, This is my first post on WOS. Like most people here I owned a Spectrum when a teenager. At that time I was quite heavily into programmin…
... against
CDLOOP PUSH BC
LD (HL),0 ;Reset Collision Detection Flags ... ;for next sprite
POP DE
POP BC
DJNZ CDLOOP ... /> SET 1,(HL)
RET
RETURN POP BC
LD A,9 ...Pixel setting / general speccy codingi just started doing some cross-coding with the [url="http://www.bigfatpanda.fsnet.co.uk/z80.html"]Z80 SNA assembler[/url] and an emulator, and this …
... ,A
LD B,0
ADD HL,BC
LD A,(HL) ; get pixelpointer ... /> XOR (HL) ; reset pixel
LD (HL),A ; put back on screen
RET ...need help with speed optimization. this procedure draws a sprite with mask from memory onto the screen with x-coordinate in pixels. it doesn't shift sprites in realtime, it just uses …
... .
Take out the LD IXL,0 instructions
DEC A
LD HL,JUMPTAB
ADD A,A ... /> LD L,A
LD SP,HL
POP IY
POP HL
LD (JMPADDR+1),HL
IM2 Machine Code Sprites Example Code Using Char Based SystemFurther to my earlier post, here are sprites running using char method with IM2 driving it Note, for 48k spectrum using TASM [code] ; ***********…
... ), SP
EX DE, HL
LD SP, HL
EX DE, HL
POP DE ...
LD (HL), E ...Anyone know the address mappings...of the hardware resources on the speccy; From the screen display address range to all the hardware control registers. etc. Where can I get access t…
...
CDETECT LD HL,64010 ;address of first sprite ... DEC C ;Will add BC & HL later to point to< ... />
INCPOINTER ADD HL,BC ;no collision so move to ... RET
COLLISION POP BC
LD A,MAXSPRITES ;MAXSPRITES - B gives ...Collision DetectionHi everyone, This is my first post on WOS. Like most people here I owned a Spectrum when a teenager. At that time I was quite heavily into programmin…
...
CDETECT LD HL,64010 ;address of first sprite ... DEC C ;Will add BC & HL later to point to< ... />
INCPOINTER ADD HL,BC ;no collision so move to ... RET
COLLISION POP BC
LD A,MAXSPRITES ;MAXSPRITES - B ...Installing Z88DK Z88DK INSTALLATION Z88DK is distributed in two parts. The first part is the platform independent bits (including source and z80 libraries) and th…
... /> call sp_PrintAtInv
pop bc
pop bc
pop bc
pop bc
ld hl,20 ;const
pop bc
pop bc
pop bc
pop bc
ld hl,(_sp_ClipStruct)
push hl
push
na_th_an
April 2005
Development
Switch to 48mode without 'SPECTRUM' commandIs there a poke(s) to switch to 48 mode without SPECTRUM command. I want my tape loaders to switch automatically. I know how to switch ram banks ok…
... /> LD (HL),76h
DEC HL
LD (HL),0
DEC HL
LD (HL),51h
LD SP,HL ...
LD BC,7FFDh
LD ...Machine Code: quicksort optimisationI came across this z80 quicksort implementation when going through the wikipedia article on the same. It's 44 bytes long. I was wondering if any of …
... br /> ld (bc),a
ld a,h
ld (de),a
pop hl ;restore ... pop hl ;restore pivot
pop hl ;pop lo
push bc ;stack=left-hi
ld ...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…
... : I've started using a ld a,r command to grab ... />
.rand
ld hl,(int_seed)
ld a,h
add ...Calling ROM routinesFirstly, sorry if this is the wrong forum to post this in, but I wasn?t quite sure under which heading is best fitted. I?m trying to figure out how…
... CH ADD
LD BC,35000
LD (23645),BC
POP BC
LD (23645),BC
... ; Move answer into BC then RET
PUSH HL ...
POP BC ...Vector drawing routines.Anybody could point me to some sort of vector drawing package of routines, callable from BASIC? With "vector drawing" I mean to draw 2D pictures with…
... /> POP BC
LD C,A ; X-pos to C
POP HL
LD (#5C5D),HL ...Multi-tasking OS on the Spectrum?Do you think it is possible to build a multi-tasking operating system on the Spectrum? That is, most important the ability to have several task run…
... the stack pointer - see the LD SP, HL instruction. Going the other way ... takes two instructions; LD HL, 0 followed by ADD HL, SP.
Note ... when you save context, and pop the lot when you restore ...Understanding the StackSorry folks. I guess I'm going to be a pain for a little while. Hope it's ok with everyone. I'm currently studying the stack and wrote the little pr…
... , LD BC, (SP) will do the trick (or maybe LC C,(SP); INC SP; LD B,(SP ... to HL
ADD HL,SP ;HL now holds the current SP (there's no LD HL,SP ...
...
LD SP,HL ;Restore the original SP[/CODE]
[QUOTE ...Understanding the StackSorry folks. I guess I'm going to be a pain for a little while. Hope it's ok with everyone. I'm currently studying the stack and wrote the little pr…
... ROM):
[CODE]
LD (END+1),SP
LD SP,SOMEDATA
... ; do ... something with the data
END: LD SP ... /> PRINT
POP HL
LD A,(HL)
INC HL
PUSH HL
OR ...Tips on optimizing some newbie assembly routinesI'm starting to learn some assembly language. The best way to learn is to actually code something you are going to use, so I'm creating a very simple…
... ; Next cell...
pop hl
pop bc
ld a, c
cp ... />
; Next cell...
pop hl
inc e
Speccy games programmingI've got a question. Where games written in pure machine code or was it a level higher with Assembly language being the choice? I always thought it…
... ]paranoid_nop_backs exx ;HL' = SP
ld sp,nop_back_table ;Table start
nop_back_adds_loop pop hl ;Address
Speccy games programmingI've got a question. Where games written in pure machine code or was it a level higher with Assembly language being the choice? I always thought it…
... ]paranoid_nop_backs exx ;HL' = SP
ld sp,nop_back_table ;Table start
nop_back_adds_loop pop hl ;Address
