-
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…
... /> add hl,bc
ld e,(hl)
inc hl
ld d,(hl)
ld hl,(x ... /> add hl,bc
ld e,(hl)
inc hl
ld d,(hl)
ld hl,(y ... /> add hl,bc
ld e,(hl)
inc hl
ld d,… -
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…
... /> ld hl,numbers
ld bc,7
bubble ld (temp),hl ; temp = (hl)
again ld ix,(temp) ; ix ... -
Pimp my code...Erm, this is just the result of a mental exercise - I wanted to repeatedly display a UDG but decided against using a ROM routine and UDGs! Any sugges…
... org #8000
;
ld hl,#4000
ld b,#08
;
even ld a,#2a
jr cpy ...
odd ld a,#54
jr cpy ... inc de
ld bc,#0100
ld (hl),a
ldir< ... -
Screen LoaderCouple days ago i find very interesting loader routine in ex Yugoslavia magazine "Svet Kompjutera" from january 1987. Authors of article, calls this …
... /> LD HL,49152
LD (HIL),HL
LD DE,16384
LD (DIL),DE
LD ... /> LD (FL1),A
LD HL,(HIL)
INC HL
LD (HIL),HL
LD DE ... /> KRA LD HL,RP
LD (RRR+1),HL
LD DE,23295
LD H… -
Pixel Explosion CodeJust a little snippet to cause explosive effects. It uses table lookups for the screen address, and can handle up to 32 pixel particles. A particle…
... not moved
ld hl,madp_dec
ld (madp_poke+1),hl
... new position)
ld hl,madp_move
ld (madp_poke+1),hl
xor (hl) ; xor with screen
ld (hl),a ; screen ... -
SjASMPlus cross compiler of Z80 assembly languageHi! I want to present you cross-compiler of Z80 assembly language: [B]SjASMPlus[/B]. [SIZE="4"]Features:[/SIZE] [LIST] [*]Z80/R800 documented and un…
...
[*]Code inlining through colon (LD A,C:INC A:PUSH ... AF:IFDEF FX:LD A,D:ENDIF…)
[*]Structures ... /> [*]Fake instructions as LD HL,DE (LD H,D:LD L,E)
[*]Source ... -
License plateWhat's wrong with the car with this dutch license plate 89-46-ZX It is an OPEL COMMODORE! Anyone found other Spectrum / Z80 based plates? We had a…
... combinations like these
LD-HL-23
LD-45-SP
ZX ... -
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…
... /> ld a, (hl) ; bring a byte
dec hl ; move back
ld (hl), a ... ; store byte
inc hl
inc hl ; next one!
ld ... /> ld (hl), a ; store byte
inc hl
inc hl ; next bye.
ld ... -
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…
... /> ld hl,LABEL2
ld (l891e+1),sp
ld sp,hl
pop hl
ld ... /> l8ac5: ld hl,l8d6b
ld a,(hl)
inc hl
ld (l8ac5+1),hl
pop hl
ld hl,#0000
l8b95: ld a,(hl)
or a ... -
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. …
... /> ld (hl),b ;
inc h ;
ld (hl),b ;
inc l ;
ld (hl ... ),c ;
dec h ;
ld (hl ... ),c ;
dec h ;
ld (hl ... -
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…
...
inc hl ; move HL up one address
ld (hl),'P' ; channel ... />
ld hl,col ; increment
inc (hl) ; the column
ld a,(hl) ;
add hl,hl ; multiply
add hl,hl ; by
add hl,hl ; eight
ld de ... -
Currah MicroSource emulationIt appears to be impossible to emualte the MicroSource in software on the ZX Spectrum SE as hardware polling is required. The following patch is not …
... /> ld (hl),$07 ; to emulate polling
inc hl ;
ld (hl),$19 ;
ld hl ...
ld (hl),0 ;
inc hl ;
ld (hl),0 ;
inc hl ;
ld (hl),0 ... -
My little first set of routines.Hi all, I just coded a little set of routines just to draw a screen on video mem and a fade out. I could have just copied the screen rendering rout…
... call ClearScr
ld hl,image+2
call ... /> ld hl,SCREEN
ld (hl),0
ld bc ... ld hl,ATTRIBUTES
NextAttr:
ld a,(hl)< ... -
Comments for small "sprite" routine wantedI have just written my first machine code program and I am quite happy (and proud) to get it working! :smile: As a child I never learned anything e…
... [/B]
ld hl,16384 ;screen address
ld de,35000 ;address ... store in memory
ld (hl),a ;put graphic into screen ... ] ;rotates second byte
ld (hl),a ;write earlier rotated byte ... in saved "carry"
ld (hl),a ;write to screen memory ... -
How do I clear only a specific area of a screen (quickly) in machine code ?I'm looking for a machine code routine which will clear the first 20 rows of the Spectrum's display (or any number of rows or columns) . I have found…
... is as follows :
LD HL,4000H 33 0 64
LD (HL),L 75
LD D H 44
LD E,1 30 1 ... -
Help hacking Split PersonalitiesI`ve been hacking away at Split Personalities for the purpose of putting new screens and graphics (items). The current screen is at 41187 and is 160…
... ; 54564 32 33
ld (8737), hl ; 54566 34 33 34
inc bc ; 54591 3
ld hl, 33 ; 54592 33 33 0 ... bc ; 54626 3
ld (33314), hl ; 54627 34 34 130
ld h, c ; 54630 97[/ ... -
sound effect code causing crash[FONT=Courier New]I have just written this piece of code to produce a lazer sound effect but for some reason it is causing a crash and I can't figure…
... LD HL,SOUNDDATA
LD (SOUNDPOS),HL
LD A,1
LD (LAZERFLAG),A
LD ... RET Z
LD HL,(SOUNDPOS)
LD A,(HL)
OR A
Question on Z80 R/W cycles.Snipped from the complete spectrum ROM disassembly: [CODE] Now the memory is checked. 11DA RAM-CHECK LD H,D Transfer the value…
... br /> 11DC RAM-FILL LD (HL),+02 Enter the value ... Use current HL as top.
DEC (HL) +01 ... 11EF RAM-DONE DEC HL HL points to the last ...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…
... ]scf
ld a,255
ld ix,16384
ld de,6912 ... 1366
ld a,255
ld ix,24576
ld de,22564 ... ]di
ld de,23296
ld hl,24785
ld bc,40832
ldir[/CODE]
I know that 'hl ...Use of INPUT in MCI want to use the INPUT-command in MC and made the following code. [code] org 40000 dump 40000 ld hl,(#5c5d) push hl …
... />
ld hl,(#5c5d)
push hl
ld hl,input
ld (#5c5d),hl
call ... #2089
pop hl
ld (#5c5d),hl ...New assember ideaAs i work with Eclipse IDE in my job i become more and more lazy. This leads me to idea that it is time to left Notepad+Tasm combo behind and move on…
... myStruct
...
ld hl, (racer1.velocity)
[/code]
myfunc { ld b, 1
loop ld (hl), a
inc hl
djnz ...AY-player from Rastan SagaHello. For what ports #3F, #5F in the given fragment of a code are used? They give What effect in sounding? ================================= F4C1 21…
... =================================
F4C1 21BAF7 [B]ld hl,F7BA[/B]
F4C4 160C ... F4CD 013FFF [B][COLOR="Red"]ld bc,FF3F[/COLOR][/B] ... /> F4D8 7E [B]ld a,(hl)[/B]
F4D9 2B ... [B] dec hl[/B]
F4DA D35F ...The direct bus or indirect one... that is the questionThe Ethernet project continues...and I'm in a quandry. So I've managed to implement enough socket library for the W5100 that socket, bind, listen, a…
... , and simply use something like LD (HL), A to set a register ...If you've got a real working MF128,IF1, and MDR combo can I ask a favour?So, if you do have a real Multiface 128, Interface 1, Microdrive and, oh yeah, a Spectrum (48k or 128k) that are all working, can I ask a favour...? …
... address
push hl
exx
;
ld hl,(err_sp) ; fetch current ... error return
push hl ; and preserve ... error return
ld (err_sp),hl ; and update
ld a,$ff ; force ...help sought with first foray into machine code - pixel scrolldownI have started to code my first machine code program, a simple roadrace game. I've based it around the pixel scrolldown routine in 40 Best Machine Co…
... /> org 32000
main
ld hl,$410a ;road left side,line2 ... ,$ff ;graphic for roadside
ld (hl),a ;print road left side ... side posn
scrldn
ld hl,22527 ;point to bottom right ... to be copied to
ld hl,$7e0 ;2016 added . . .
...Bizarre stuff in Interface 1's shadow ROMAccording to the Complete Shadow ROM disassembly, the function that exits back to the BASIC interpreter after interpreting IF1 commands is this: [co…
...
[code]
05C1 END1 LD SP,(ERR-SP) Clear machine ... error code.
05C9 LD HL,+1BF4 Return address to main ... RUN-SYN
05CF LD A,+7F Give, an error ... ,RETAD-RUN
05D6 LD A,+FE
05D8 ... hard I look to that LD instruction. It just wastes ...Probing the variables in 128K modeHello again! Briefly, I'm writing an m/c routine to read some BASIC variables. So, before I start, I try to get an idea for the structure of how var…
... /> RES 0,(IY+2)
LD HL,(23627) ; VARS
NEXTVAR< ... LD A,41
POINTERS
INC HL
LD E,(HL)
INC HL ...
LD D,(HL)
INC HL
NEXTCHAR
INC HL
LD A,(HL)
BIT 7,A ...Speccy sound on tv show - againRemember the spectrum loading noise in two CSI shows? Well, fuzzix on c.s.s. has found what seems to be another clip of Speccy goodness: [url]http:/…
... br /> 30 LD HL,#53F
40 PUSH HL
50 LD DE,#4000 ...
60 LBYTE LD A ... /> 100 NBYTE LD L,1
110 LD BC,#B201
170 LD B,#B0
180 JR ...Need Help with codeHi there, let me preface this by saying I'm NOT an old school computer guy though I do remember using the internet before the WWW and my first comput…
... /> JR Z, ($+2) (e)
LD C,H
JR C ... ,A
INC (HL)
INC BC
LD HL,nn
Alternative ROM on original DivIDEOriginal DivIDE interface contain too allram mode (16kB paging). [url]http://raww.org/index.php?name=News&file=article&sid=2471[/url] Switch to ALLR…
... ROM instalation:
DI
LD A,66
OUT (227 ... ),A ;enable allram mode
LD A,64
OUT (227 ... enable
LD HL,49152
LD DE,0
LD BC,16384
LD A,0
OUT (227 ...
