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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…
... :
ld de,SCREEN+1
ld hl,SCREEN
ld (hl),0
ld bc,6143 ... /> pop bc
ld de,ATTRIBUTES
ld hl,image+6144+2
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 ... ld a,(de) ;get byte from graphic store in memory
ld (hl ... ;rotates second byte
ld (hl),a ;write earlier rotated byte ... in saved "carry"
ld (hl),a ;write to screen memory ...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 ... 24 ; 54608 22 24
ld a, (de) ; 54610 26
ccf ... bc ; 54626 3
ld (33314), hl ; 54627 34 34 130< ...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…
... RAMTOP).
11DC RAM-FILL LD (HL),+02 Enter the value of ... /> SBC HL,DE The carry flag will become
ADD HL,DE reset when ...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
call 1366
ld a ... ,255
ld ix,24576
ld de,22564
[CODE]di
ld de,23296
ld hl,24785
ld bc,40832
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 ... ,0 ; clear bc
ld de,gethook ; use de to trap for those ... pesky disciples/+d's
ld (hd_11),de ;
rst $08 ; page ...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…
... /> main
ld hl,$410a ;road left side,line2
ld de,$4115 ;road ... roadside
ld (hl),a ;print road left side
ld (de),a ;print ...
copybyte
ld a,(de) ;copy byte. . .
ld (hl),a ;. . .to next ...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 DE,19
PRINT
RST $10
ADD HL,DE
INC HL
LD E,(HL)
INC HL
LD D,(HL)
INC HL
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:/…
... LD HL,#53F
40 PUSH HL
50 LD DE,#4000
60 LBYTE LD ... /> 100 NBYTE LD L,1
110 LD BC,#B201
140 LD A,#CB
150 ... 160 RL L
170 LD B,#B0
180 JR ...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 ... + write enable
LD HL,49152
LD DE,0
LD BC,16384
LD A,0
OUT (227 ...128 ROM paging alternativeWould this work (with the appropriate code in each ROM)? [code] ; 128 rom paging routine ; use rst 28h with call address stored after restart ;;rom…
... hl, sp ;
ld e, (hl) ; (sp) to de
inc hl ;
ld d, (hl ... ) ;
ex de, hl ... ; skip two bytes
inc hl ...Bresenham's line algorithmHelp - I really am struggling to get my head around this algorithm. I don't know why, I coped with Cordic (SIN/COS) and integer divide routines (/10 …
... part...
LD HL,(real328+$02) ;HL has relative Y value ... />
PUSH HL ;preserve HL
SBC HL,BC ;if Y> ... HL (Y) and BC (X)
gfxdraw2:
PUSH DE ;keep DE ...
;deal with SGN X
LD A ...Bresenhams circle algorithmI post here my final circle code to replace, if you want, the one in the ROM. It only uses integer math and runs very fast and is very compact. It is…
... />
EXX
LD HL,$2758 ;HL' must contain $2758 on return ... />
plotpixel
push de
call $22e5
pop de
ret
CHANS system variableI modified my original code to incorporate Woody's changes and avoid using the stack: [code] org 60000 save_registers: push hl push de push bc …
... /> make_space:
ld hl, 30720 ; first address after attributes
ld de, (0x5c4f) ; current ... start of channel data (chans)
sbc hl, de ; calculate ...So... you want to format your 3.5" as 720K eh?Well, i've been trying to get hold of an application to make proper use of my 3.5" +3 floppy disks but i haven't been able to find any. I stumbled up…
... updated
LD HL,HEAD0 ; Load HL with the ... HL with the last address used
LD L,E
INC DE ... ; The DE register will hold HL+1
LD (HL),$E5 ...Xor-shift random number generator for Z80[QUOTE=Patrik Rak;320244]Come on, people, [URL="http://www.jstatsoft.org/v08/i14/paper"]xor-shift generators[/URL] devised by Marsaglia, that's the w…
... /> [CODE]
rnd ld hl,0xA280
ld de,0xC0DE
ld a,h ; t ... /> xor e
ld e,a
ld a,d ; w = w ...New for 2009 - mc onelinersI found the limit of one line and one screen's worth of program really useful in (re-)learning BASIC, so I've decided to carry the format over into m…
... /> ld (hl),a
inc hl
ld (hl),a
ld de,9
add hl,de
ld (hl ... ),a
inc hl
ld (hl ... /> ld (hl),a
inc hl
ld (hl),a
ld de,9
add hl,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…
... from stack
EX DE,HL
LD A,(HL) ; fetch value of card ...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 de, 0101h
push de
ld (spp), sp
ld hl, spp
inc (hl ... )
inc (hl)
ld ... account for this when using LD SP instructions. The removal of ...IN 255 behaviour not emulated in Spectaculator and ZXSpinI'm not speaking about "normal" IN 255 behaviour. All of you know what I'm taking about: IN 255 can be used to "read" screen data as it's retrieved f…
... with PASMO):
[code] ;Rutina de test del puerto 255. (C ...
halt
ld c,255
ld hl,0
SigueTest in ...Fastest way to clear a screen.We haven't had an optimizing fun for some time, so let's have some: What's the fastest way to clear a screen (i.e., filling the 6912 bytes at 16384 w…
... :
[CODE]
LD HL,16384 ; 3B 10T
LD DE,16385 ; 3B 10T ...
LD BC,6911 ; 3B 10T
LD (HL),L ...Rainbow Generator for 48K Spectrum using PUSHThis is what I came up with from [B]gasman[/B]'s suggestions. It's stable in ZXSpin and ZX32 simulating a 48K Speccy. Anyone like to try it on the …
... '
ld hl,65024 ;254*256=65024
ld de,65025
ld (hl),253 ;Write ... once
ld bc, 256 ... routine:
ld hl,sample_jump ;Sample instruction (see below)
ld de,65021 ;Where ...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…
... hl, hl ; * 8
ld de, _MB23_tileset
add hl, de
pop de
push de
ld ...FLASH EPROM programming on ZXExist any other software for rewriting FLASH EPROM or EEPROM chips on real ZX ? I know only: EEPROM flasher for original DivIDE [url]http://85.132.…
...
org $5cd0
ld hl, $4000 ;
di ... targer adress HL
ld a, $60 ; DE = source ... br /> ld a, (de) ; read source byte
ld (hl), a ; ...Machine Code Microdrive File LoaderI've been experimenting with transferring games to run from microdrive. Typically I like to see a loading screen while things are happening, and I li…
...
pop hl
add hl,de
ld de,hd_00
ld bc,$0009
ldir
;
ld l ...
ld d,(ix+$54)
inc de
add hl,de
;
Tinkering with Quique Llar?a's Midi2Ay tool...Im tinkering with Quique Llar?a's Midi2Ay tool, found at: [url]ftp://ftp.worldofspectrum.org/pub/sinclair/tools/pc/midi2ay-0.1.zip[/url] Im not a v…
... /> ld hl,(G_AF)
push hl
pop af
ld hl,(G_HL)
ld de ... ,(G_DE)
ld bc,(G_BC)
ld hl,(R_AF)
push hl
pop af
ld hl,(R_HL)
ld de ...Tutorial - learn machine code in 30mins[B][I]Message from the moderators[/I] - bigjon has requested that readers' attention be drawn to a better version of this tutorial, one which is easi…
... /> ld (hl),a
inc hl
ld (hl),a
ld de,9
add hl,de
ld (hl ... ),a
inc hl
ld (hl ... /> ld (hl),a
inc hl
ld (hl),a
ld de,9
add hl,Need help with interrupts againI'm fighting to understand how interrupts code handling works I'm trying to set my simple own interrupt routine, as I don't want to be dependent on …
... /> LD HL,23296 ;fill 256 bytes with value 255
LD DE,23297
LD ... BC,255
LD (HL),C
LDIR ... /> LD HL,77*256+237
LD (65525),HL
LD A ...
