-
Any ideas on speeding up this assembler segment?It copies a pixel column of a rectangle which may be anywhere in the display file to a pixel column in d$. The source column may start at any bit pos…
... position 1->8
ld a,(hl) ; 7
rotbit0: ... br /> ex de,hl ; 4
or (hl) ; 7
ld (hl),a ; 7 ... set selected bit in d$()
ex de,hl ... -
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…
... /> add hl,bc
ld a,(hl)
inc hl
ld h,(hl)
ld l ... ,a
push hl ... -
multi-scroll m/c subroutine for BASICArising from recent posts, here's a scrolling routine that will manage multiple left/right scrollings for any (sensible) line width or step; (ie. whe…
Arising from recent posts, here's a scrolling routine that will manage multiple left/right scrollings for any (sensible) line width or step; (ie. where width is -
High Score ASCII array reset ?Hey guys, Noob alert! I'm working on my first game and I'm having problems with the high score on the second time through the game loop. My high …
... /> Ld hl, score
Ld b, 6
Loop ld, (Hl),'o'
Inc hl ... -
calculator and sinusok, look at the Sysel's routine: [PHP]3 5b00 *s 4 5b00 tabsin = #7000 03 mksin 19.11.1995 Busy soft …
...
8 8004 210070 mksin ld hl,tabsin
9 8007 7d ... br /> 10 8008 e5 push hl
11 8009 cd282d call ... 801f e1 pop hl
24 8020 77 ld (hl),a
25 ... -
Graph Plothi! please, help with code: [PHP]For x=-100 To 100 For y=-100 To 100 If (x/2-25)*(x/2-25)+(y-50)*(y-50)<200 Or (x/2+25)*(x/2+25)+(y-50)*(y-50)<200 th…
hi! please, help with code:
[PHP]For x=-100 To 100
For y=-100 To 100
If (x/2-25)*(x/2-25)+(y-50)*(y-50) -
Optimisations in Exomizer Z80 decrunch codeThis is the 163 bytes old code (simple and optimized): [CODE] ld iy, exo_mapbasebits ld a, 128 ld b, 52 push de exo…
... ;bits[i]=b1
push hl
ld hl, 1
defb 210 ... ;bits[i]=b1
push hl
ld hl, 1
defb 210 ... -
Elliptical ChallengeSubsequent to the recent "Graph Plot" thread, I wrote this general purpose ellipse drawing routine which will plot (although it doesn't actually use …
... ;end_calc
ld hl,(STKENDO)
ld de,STKSTOR
ld bc,20
ld hl,STKSTOR
ld de,(STKENDO)
ld bc,20
Omitting LETAn untested thought. Changing: [code]1B34 SUB $CE ; Reduce command code by $CE to ; give 00 to 31 for comman…
... ,TRYLET
...
TRYLET LD HL,(CHADD) ; Step CHADD back to ... statment
DEC HL
LD (CHADD),HL
LD A,'LET'-$CE ; Set ...Machine code RST10 problemHello! After 27 years of playing with Spectrums I'm starting to look into doing assembly language properly. All went swimmingly well until I wrote …
... ,hl ; remember HL as it points to the message
ld hl ... ,msgctl ; point to message control codes
.msgpcc ld a,(hl) ... print it
inc hl ; point to next control character ... ex de,hl ; recall hl pointing to message
.msgpch ld a,(hl) ; ...How do you restrict this routines actions?I'm trying to plagiarise a piece of code I came across in the 80's, but seem to be banging my head against a brick wall! The routine fades the scree…
...
l_b798: ld hl, 22528+32
l_b79b: ld a, (hl)
ld b, a ... , b
l_b7ca: ld (hl), a
inc hl
ld a, h
ret
fader: ld b, 16
l_b7d5: push ...
jr l_b798
l_b7d8: ld bc, 511
l_b7db: dec ...Printing textThis is probably quite a basic question, or there might be something obvious I'm missing. I'm looking for an economical way of printing formatted te…
...
ld hl,text_to_print
print_text
ld a,(hl)
or ...
rst 16
inc hl
jr print_text
"Chronos": how fast should it really be?I was reading [URL="http://timfollin.pwp.blueyonder.co.uk/Archive.htm"]Tim Follin's webpage[/URL] the other day and came across a curious remark abou…
... 58426: ld hl, 64484
58429: ld de, 3
58432: ld b, 128 ...
58434: rld ;1
58436: dec hl ... :
[CODE]
ld hl, 64484
ld b, 128
rld
dec hl ; take care of misaligned buffer ...Chronos (BUGFIX)Please add the following "known errors" entry to [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0000951"]Chronos[/URL]: [QUOTE]Bugfix provid…
... cycle:
[CODE]58426: ld hl, 64484 ; off-screen buffer
rld
dec hl
nop ; unnecessary NOP< ... below:
[CODE]58426: ld hl, 64484 ; off-screen buffer
Works in Fuse & SpecEmu, not ZXSpinI decided that I wanted to change the scroll routine which I was using for compiling the Trailblazer maps, as I'd just copied it out of Andrew Hewson…
... /> call CHARSCROLL
ld hl,23296
ld de,16394 ;HL=(DF_CC) for line ...
call PATTERN
ld de,16426 ;HL=(DF_CC) for line 1 ...Some thoughs about fast scrolling on 128 modelPlease, consider this article as technically interesting concept not a proven algorithm. ONE The fastest scrollers use long sequence of PUSH inst…
...
[CODE]
ld hl, (register_x)
push hl
[/CODE]
Stop ... it generates
[CODE]
; ld hl, (register_x) - it is same pattern ... we skip loading
push hl
[/CODE]
Do you ...Idk>le me browsing through some game's code >..... [code]61A8 F5 push af 61A9 3EFF ld a,FF 61AB D37F out (7F),a 61AD D33F ou…
... 22BE62 ld (62BE),hl
620F 2100CD ld hl,CD00
6212 22BC62 ld (62BC),hl ... call 62C3
622B 73 ld (hl),e
622C 23 inc ...
623E 21E462 ld hl,62E4
6241 011A00 ld bc,001A
Machine code assistance please #1Dear all, Learning the ropes here, so please excuse these odd questions which may seem simplistic to you learned lot. This routine is placed at 33…
... /> [code]
ld l,155
ld c,200
ld a,c ...
add a,l
ld c,a
ret
[code]
ld hl,0
ld bc,0
[/code ...Struggling with this routine... Any ideas?I'm trying to write a routine that plots 3 pixels to decrease the energy bar in the top right corner by 5 units, but it just wont have it! There mus…
... /> [CODE]org 30000
ld b,5 ;decrease energy by ... push bc
loop1 ld hl,51993 ;address energy level is ... stored
dec (hl) ;decrease energy level(5 ... br /> ld (23695),a ;set colour
ld a,(hl) ; ... load a with energy level
ld b ...Rotronics Wafadrive v.1.80 ROM - Corrupt or purposely broken?I've been digging around the Wafadrive v1.80 ROM (from [URL="http://zxspectrum.it.omegahg.com/_RO.htm"]here[/URL]) and can't decide if the ROM is cor…
... ld hl, $009f
ex (sp), hl
push hl
ld e, a
ld ... d, $00
ld hl ... hl, de
ld e, (hl)
inc hl
ld h, (hl)
ld ... ;
l_0d63: ld hl, ($5ce3)
jp (hl)
;
Strider II (and others) + 3 disk versionsHello everyone, I've been working on converting some games to be able to load them from the +3 floppy. I started with single load games but now Im i…
... /> call paging
ld hl, 0
ld de, 0
call ...
read_fileLenght
LD HL, 16 ; set position after first ... /> ld HL, 53248 ;block "B" dest addr
ld (destadd+1), hl
ld a ...30-column 8x2 multicolor (even in 48K)I don't recall any 8x2 multicolor routine for 30 columns that would work on all Spectrum models (including the Spectrum 48K), so I decided to write i…
... LD HL,nn
LD DE,nn
LD BC,nn
EXX
LD HL ... PUSH HL ; columns 21 and 22
LD HL,nn
LD (nn),HL ; ... columns 29 and 30
ADD HL,HL ...Movin And A Groovin Horizontal Flip improvementOn the left is the flip horizontal portion from Andy Pennell'S excellent Movin' & a Groovin' machine code screen routines from Your Spectrum #19 (Oct…
... />
FLIPHO LD HL,#400F ;LHS FlipHorizontal LD HL,16384+15
LD IX,#4010 ... /> flattr LD A,(HL)
LD C,(IX+0)
LD (HL),C
LD (IX ...MGT MOUSE - exist really ?I read disassembly of +D rom/ram code and from address #2249 is routine for read MGT MOUSE ports. I can't find any info about "MGT MOUSE". Exist real…
... 2255 LD HL,#228B,SIGN_MOUSE
2258 PUSH HL
2259 LD HL,# ... 2275,MOVE_VERT
225C PUSH HL< ...
2275 MOVE_VERT LD HL,#3DF2 Y-coordinate of mouse ...Routine for Currah speechI'm currently writing a routine for the Currah that will provide speech during a game. A timer is set to initiate the speech every 50 cycles of the …
... />
Start: ld hl, Dat1
ld de, 65361
ld b, 15 ;load ... with 4
Loop: ld a, (hl)
ld (de), a ;load allophone ... last byte in buffer
ld (65364), hl ;update pointer
ret ...Can a guy that traveled on the short bus learn machine code...Hmmm So after some soul searching I figured it was time to finaly nail spectrum machine code. Its so frustrating to sit infront of a basic listing w…
... = LD A,
06 = LD B,
0E = LD C,
16 = LD D ... = LD E,
26 = LD H,
2E = LD L,
01 = LD BC ... ,
11 = LD DE ... ,
21 = LD HL,
MC LPRINT 23681Having problems with this routine to print large on the screen using LPRINT, it works ok in BASIC, but cant seem to get it to loop for some reason in…
... call cols ;fill attributes
ld hl,72 ;start of address to ... br /> loop ld (23681),hl ;poke address with hl
push hl
... cols ld hl,22816 ;random colours
ld b,159
lp2 ld a ... inc a
ld (hl),a
inc hl
djnz lp2
JSW2 - Game Loader DifferencesThere are three official releases of JSW2. I'm not counting the 'JSW2-128' version here as far as I'm aware this was not in any way 'official' as it …
There are three official releases of JSW2. I'm not counting the 'JSW2-128' version here as far as I'm aware this was not in any way 'official' as it incorporates a built in cheat mode. Feedback on this point is appreciated. To quote the readme:
128 BASIC-compatible way of loading BASIC as code?On a 48K Speccy (or from 48 BASIC or USR 0 mode on a 128K machine), one can do a silly trick like this: [code];; load a 4000 byte BASIC program ld i…
... byte BASIC program
ld ix,23552 ; start address ... of system variables
ld de,4000
call ... line 100
ld hl,100
ld (23618),hl
ld a,1 ; ... statement 1
ld (23620), ...SCREEN$ bug fixI've been using the SCREEN$() function recently for reading data off the screen rather than taking up space with an array and I got fed up with the s…
... discard
ld hl,(23606) ;HL=(CHARS)
ld (23680),hl
ld hl,(23675) ;HL=(UDG)
dec h
ld ...
