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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 ... BC
LD BC,32
ADD HL,BC
EX DE,HL
ADD HL,BC
KRA LD HL,RP
LD (RRR+1),HL
LD DE,23295
LDUrgent 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…
... hl
ld bc,#0044
add hl,bc
ld de,l8900
; ld bc,#0489
ld bc ... ,l8900+4
l88c9: ld ...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 bc,$17e0 ; offset
add hl,bc ;
call cp32bytes ; copy attributes
ld bc ...
ld bc,$07e0 ; subtract 1761 from hl
sbc hl,bc ; point hl at next ...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 hl ; move hl down one address
ld bc,$0005 ; the ...
inc hl ; move HL up one address
ld bc,chan_4 ; could ...
inc hl ; move HL up one address
ld bc,$15c4 ; address ...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),$19 ;
ld hl,uS_patch ; source
ld de,$18fe ; destination
ld bc ... /> ld (hl),$18 ;
ld hl,ZX_patch ; source
ld de,$18f3 ; destination
ld bc ...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…
... ,SCREEN+1
ld hl,SCREEN
ld (hl),0
ld bc,6143
ldir ... bc
ld de,ATTRIBUTES
ld hl,image+6144+2
ld bc,768 ...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…
... /> LD HL,4000H 33 0 64
LD BC,17FFH 1 255 23
LD (HL ... ),L 75
LD D ... H 44
LD E,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 ... 0
inc bc ; 54626 3
ld (33314), hl ; 54627 34 34 ...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 BC ...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…
... /> ld a,255
ld ix,16384
ld de, ... /> ld a,255
ld ix,24576
ld de, ...
ld de,23296
ld hl,24785
ld bc,40832
ldir[/CODE]
I know that 'hl' ... the destination address, and 'bc' sets the amount of ...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…
... br /> 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 ...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
ld (err_sp),hl ; and update
ld a,$ff ; force ... /> detectrom
ld (err_sp),sp
ld bc,0 ; clear bc
ld de,gethook ...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 ... right side to line1
ld bc,$bf00 ;set counter to 191 ... side posn
scrldn
ld hl,22527 ;point to bottom right ...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:/…
... /> 30 LD HL,#53F
40 PUSH HL
50 LD DE,#4000 ...
60 LBYTE LD A ... br /> 100 NBYTE LD L,1
110 LD BC,#B201
... 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 ... enable
LD HL,49152
LD DE,0
LD BC,16384
LDIR ... 49152 to DivIDE memory)
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…
... /> ld hl, 0x0000 ; sp to hl
add hl, sp ;
ld e, (hl) ; (sp ... 4, (hl) ; set rom1
ld a, (hl) ; get value
ld bc, 0x7ffd ; bc holds ... 4, (hl) ; set rom0
ld a, (hl) ; get value
ld bc, 0x7ffd ; bc holds ...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 …
... />
LD HL,(real328+$02) ;HL has relative Y value ($032A)
LD BC,(real328 ... br />
PUSH HL ;preserve HL
SBC HL,BC ;if Y>X ... BC/HL to keep X>Y
LD A,H
LD ...
LD L,C
LD C,A ;swap HL (Y) and BC (X ...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…
... BC needs to hold 495
LD H,D ; Load HL ... PUSH BC ; Preserve registers
LD BC,32765
LD A,( ... paging
LD BC,32765
LD A,16 ; ...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 bc,0 ;initialise score
push bc ;save score
ld hl,23278 ... ;erase car
ld (hl),a
ei
ld bc,65278 ;read keyboard ... /> ld (hl),a
ld hl,23263 ;scroll road
ld de,23295
ld bc,736 ...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…
...
LD HL,#1821
LD BC,(23688)
SBC HL,BC
LD B,H ...Thinking in Assembly (first efforts)The following is one small routine to educate myself on a few concepts (jumps, flow control, routines, CPI): [code]searchmem xor a …
... = 0
ld bc, 0ffffh ; search the entire memory
ld hl, 0 ; start ... found address
push hl
pop bc ; retrieve address
ret ...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…
... /> LD HL,16384 ; 3B 10T
LD DE,16385 ; 3B 10T
LD BC,6911 ... ; 3B 10T
LD (HL),L ; 1B 7T ...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 …
... br /> ld de,65025
ld (hl),253 ;Write once
ld bc, 256 ... ei ;Enable interrupts
ld bc,colour_map ;Give you the address ... for the top border:
ld bc, 435
interrupt_delay_loop
bc
pop de
pop hl
ld sp, ...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…
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…
... /> ;
ld hl,filenam
ld (t_str1),hl ; address of filename
;
; ld hl,1 ... /> pop hl
add hl,de
ld de,hd_00
ld bc,$0009
ldir
;
ld ...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…
... hl
pop af
ld hl,(G_HL)
ld de,(G_DE)
ld bc ... hl
pop af
ld hl,(R_HL)
ld de,(R_DE)
ld bc ... ,(R_BC)
ld SP ...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,23263 ;scroll road
ld de,23295
ld bc,736
ld (hl),a
ei
ld bc,65278 ;read keyboard ... /> ld (hl),a
ld hl,23263 ;scroll road
ld de,23295
ld bc,736 ...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 …
... 255
LD DE,23297
LD BC,255
LD (HL),C
LDIR ...
LD A,24
LD ... /> LD HL,77*256+237
LD (65525),HL
LD A ...Rom Routines list ?Exist some document that show detailled the routines on the spectrum ROM ? Ad for the Spectrum +3 ? are they the same or exist more ? Example i was …
... :
push BC
ld bc,#5d70
push hl
push af ... /> pop af
pop hl
pop bc
This routine ...
