-
Arkanoid / Batty clones ?Although there is an old 2008 topic [url="https://worldofspectrum.org/forums/discussion/16532/best-worst-arkanoid-clones/"]here[/url] , I felt a new …
... can redirect to your slowdown cycle from the next command:
$5D06 $20, $FB jr nz, $5D03 ; wait loop
$5D08 ... -
How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
...
cp 7
jp nz, .carryon; no, so carry on ...
ld l, a
jr nc, .carryon
; this bit ...
or a
jp nz, .notaligned
; if we bail ... it - it's beer o'clock of course). The player collides ... -
Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... e
or a
jr nz, .somethingpressed
; this next bit ... .morebits
dec d
jr z, .toomanylines
dec e ... br /> ld e, a
jr nz, .morebits
; D now ... well, that's beer o'clock coding for you!
< ... -
Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... )
cp TAG_NIL
jr nz, .isnotnil
ld (hl ... /> ld hl, str_err_not_an_integer
jr errorreturnmessage
... /> ld hl, str_err_not_a_bool
jr errorreturnmessage
... s] 3 (beer o'clock).
Need ... -
Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... it's not beer o'clock!
Latest ... '\'
inc hl
jr nz, .dontchecknext
inc hl< ... TAG
cp TAG_CPAIR
jr nz, .notcpair
.iscpair
... br /> cp TAG_SYMBOL
jr nz, .notsymbol
call intrinsic_lookup ... -
Assembler code from tutorial, problem!I was wondering if anyone could help me decipher this z80 assembler code? ORG 60000 LOAD 60000 EA60 21BCEA LD …
... reached 10?
EA6A 2005 JR NZ,CHANGE ;go on if not ... next digit
EA6F 18F2 JR OVFLOW ;go back for next ... -
Short Z80 QuizQ1) Which program gives different result ? A) XOR A ADD A,A B) XOR A ADC A,A C) SCF ADD A,A D) SCF ADC A,A Q2) What is the equivalent of NEG …
AY-3-8912 help !Hi all. Happy new yeay. I'm new to spectrum programming, and am interested in writing some music for the +2 AY chip. The problem is...I cant find …
... data for every concievable AY clock cycle, and also, a kind of ...AY MusicHi all. Happy new year! I'm new to spectrum programming, and am interested in writing some music for the +2 AY chip. The problem is...I cant find a…
... data for every concievable AY clock cycle, and also, a kind of ...IM 2 interrupts and smooth scrolling - easy peasy!Okay, been fiddling around with IM 2 and have actually mastered (I think) how to use IM 2! Now I run my game Ragnar Revival in IM2 and use HALT to sy…
... ]
.org 35000
jr start
;a test ... ,(07Eh)
and 1
jr nz mainloop ;No space, repeat mainloop ...Machine Code Sprites Example Code Using Char Based SystemBelow is my WIP code to do smooth screen wrapping sprites using char positions and offsets, as opposed to writing direct to a line (0-191) and shifti…
... horizontal
AND 240
JR NZ,up
down:
; ... 5)
CP RECTBOTTOM
JR NZ,up2
LD ... /> CP RECTRIGHT+1
JR NZ,ps2
LD A,RECTLEFT ...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] ; ***********…
... horizontal
AND 240
JR NZ,up
down:
; ... 5)
CP RECTBOTTOM
JR NZ,up2
LD ... /> CP RECTRIGHT+1
JR NZ,ps2
LD A,RECTLEFT ...Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …
... ),A
CP 8
JR NZ,ok1
LD A ... A
CP 23
JR NZ,ok2
LD A,0 ...Smooth Masked Sprites using fast page flip on 48k Part 2Ok, After all the suggestions in Part 1, which were all excellent (Thankyou), I opted on the following: I have 2 x 6k Offscreen areas (Yes, that's …
... br /> CP 255
JR NZ,prelp
LD ...
CP 8
JR NZ,lp2
LD ... /> CP 22
JR NZ,ok2
LD A, ... +1),A
JP NZ,goa
Optimisation Needed! Is this the Fastest way to copy bytes from screen and back again?I have the screen address (say 0,0 i.e 16384) I want to copy 4 bytes wide by 32 bytes high from the screen to an area of memory. I then want to cop…
... br /> dec ixh
jr nz,C2S_1
...
dec ixh
jr nz,C2SC_1
dec ixh
jr nz,lp1
< ...Spin save dissembly problemHey Dunny and others Spin dudes! There seems to be a small problem with the save dissembly function from the dissembler in Spin. This is the exact o…
Problem with rotating procedureHi folks! I wrote a proc in z80 asm, based on: x' = x * cos (z) - y * sin (z) y' = x * sin (z) + y * cos (z) I used a precalculated table of sin a…
... hl,hl
rla
jr nc,fin21
add hl ... - wyzeruj
cp 3
jr nz,r1
ld a,l ...
cp $d0
jr nz,r1
ld hl,0 ...In Machine Code, what is the quickest way to sort bytes?I am playing around with some ordering of sprites, where I want to order them by vertical position. I used some Rodnay Zaks code to order some bytes…
... ascending order (Changing "jr nc,noswitch" to "jr c,noswitch" gets ... br /> cp e ; compare
jr nc,noswitch ; go to nowitch ... flag,h ; exchanged=1?
jr nz,again ; restart if flag=1 ...Screen LoaderCouple days ago i find very interesting loader routine in ex Yugoslavia magazine "Svet Kompjutera" from january 1987. Authors of article, calls this …
...
OR L
JR NZ,LFEF3
CALL LFF62
INC H
JR NZ,LFEFF
LFF0E LD B ... EX AF,AF'
JR NZ,LFF32
JR NC,LFF3C
LD ...
OR E
JR NZ,LFF28
LD A,H ... /> LFF68 DEC A
JR NZ,LFF68
AND A
tips on optimizing assemblyI wrote a small routine to rotate right a whole screen character line complete with attributes. This is my third ever assembly routine, so I guess i…
... , c
dec a
jr nz, buclebmp2 ; next iteration
dec a
jr nz, buclebmp1 ; next scanline.
dec a
jr nz, bucleattr2 ; next char.
Urgent Help needed to fix this: calling all machine code gurusI am currently trying to write tutorials on the amazing Orfeus music composer by Proxima which allows you to do multi channel music through the beepe…
... b
or c
jr nz,l88c9 ; (-13)
ld ... l8987: dec a
l8988: jr nz,l8987 ; (-3)
l898a: dec ... d
jr nz,l89a1 ; (20)
l898d:< ... br /> l8b72: dec e
jr nz,l8b5b ; (-26)
l8b75: ...Mode 2 Tile Editor SourceA Timex Mode 2 Tile Editor incorporating a byte mirror table. The compiled version is available in the CSSCGC 2008 collection from the WoS archive. …
... ; copying to the screen
jr _2nd_128 ; second 128 tiles
jr _2nd_128 ; second 128 tiles
jr nz,cp2b_a ;
ex de ... copying to the screen
jr nz,cp2b_b ;
ex ...RFC: 64 column font codeIn BASIC, type CLEAR 49999 then import the code at 50000. Then type RANDOMIZE USR 50000. This will create a new channel and attach stream #4 to it. A…
... /> dec c ; adjust counter
jr nz,ll_lp ; loop 8 times
dec c ; adjust counter
jr nz,rr_lp ; loop 8 times
dec c ; adjust counter
jr nz,lr_lp ; loop 8 times
dec c ; adjust counter
jr nz,rl_lp ; loop 8 times
Well I'm excited, but I guess you might not beHehe this is as far as I got today, a silly little border program: [PHP] ORG 32768 PROGGY: LD C,255 ; We loo…
... 16 ; Compare to 16
JR NZ,BORDERUP ; While not 16, loop ... ; Is it 1 yet?
JR NZ,OUTERLOOP; If not, go back ...
