-
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…
... a
ld (activeparticles),a
; Remove
ld b,(ix+0) ; b = xpos
ld c ... ld a,(de) ; Get graphic
xor (hl) ; xor with screen
ld (hl),a ... -
Adventure A,B,C,D,E,etcDoes anyone have any info on how this whole "Adventure A,B,etc" series came about? One of the first games I ever played on the ol' speccy was Planet…
... on how this whole "Adventure A,B,etc" series came about?
A) with me mate. I ... knew they done an Adventure B, but was never that ... fussed as they were both a bit pants.
... actually used to scare me a bit - lots to do ... -
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…
... ld l,b ;L is y
Loop:
ld A ... ,D ;Point #1
add A ... ld c,A
ld A,E
add A,L
ld b,A ...
jp Loop ;end While
... -
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…
...
SUB 65
LD B,0
LD C,A ; B holds the RAM page ... /> LD BC,32765
LD A,(23388)
XOR %10111
LD (23388),A
OUT (C),A ... -
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…
... /> [code]Loop in a,(c)
jp m,Loop[/code]
ld a,b
call PrintHex
ld a,' '
rst #10
ld a ... -
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 …
... /> di ;Disable interrupts
ld a,c ;On entering from BASIC, BC ... ; 014t
ld a,b ;04t => 018t
or c ;04t => 022t ... ,interrupt_delay_loop ;10t => 032t per loop, 7 loops per 224t line ... -
Another machine code problem, sorry[CODE] OPCODE HEX ADD LD A,00 3E00 F000 PUSH AF F5 F002 LD B,05 0605 F003 LD C,06 0E06 LOOP F005 POP AF F1 ADD A,C 80 DEC B 05 …
... F002
LD B,05 0605 F003
LD C,06 0E06 LOOP F005
POP AF F1
ADD A,C 80 ...
DEC B 05
PUSH AF F5
LD A,B ... 78
CP A,0 FE00
JP NZ(LOOP) C205F0 ... -
Cobra (improved BUGFIX)This is an improved BUGFIX for game [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0000996"]Cobra[/URL], please replace the "known errors" de…
... infinite loop:
[CODE]
95fe: ld bc,$3f28
9601: ld a,c
9602: in a,($ff) ; register 'A' always set to ... $FF in +2A/+3
9604: cp b ... bc
9602: ld a,b
9603: or c
9604: nop
Invalid combination of operands and opcodesIt says the error in the title, why is this?? [CODE] ORG 0000 LD HL, 63000 ;LOAD HL WITH STACK LOCATION LD SP, HL ;SET STACK POINTER TO HL LD A, …
... LOOP
;===============================================================================================
;===============================================================================================
;NEW
NEW
LD A ...Optimize this: Distance CalculationBased on a taylor series expansion, suggested by NA_TH_AN, I've got this so far, which is far far faster than SQR(X^2+y^2) Formula is: in a right an…
... .
LD A,B ; get original
CP C ; compare with C
JR ... NC, distance_Cbigger
LD C,A ; B was smaller ... />
SRL C ; C=C/2
XOR A
LD B,A
SBC HL ...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)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…
...
622E 78 ld a,b
622F B1 or c
6230 20F6 ... 7A ld a,d
626C EE41 xor 41
626E 57 ld d,a ...
626F 7E ld a,(hl ...Cobra (improved again BUGFIX)This is an improved BUGFIX for game [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0000996"]Cobra[/URL], that works better than the fix curre…
... loop:
[CODE]95fe: ld bc,$3f28
9601: ld a,c
9602: in a ... 'A' always set to $FF in +2A/+3
9604: cp b ... ]95fe: ld bc,$0300
9601: dec bc
9602: ld a,b
9603: or c
9604: nop
Full 16*16-digit BASIC multiplicationI liked Andre Adrian's 32-bit long multiplication routine so much that I decided to a decimal version. After all, 2^63 is only 9223372036854775808, a…
... LD A,B ; MPR IS B'C'AC
1070 LET A=17 : REM LD B,33 ; INITIALIZE LOOP ... /> FN b$(V)+FN b$(X)+FN b$(B)+FN b$(C)
1392 FOR a=1 ... TO 32: IF a$(a ...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,A
78 = LD A,B
79 = LD A,C
7A = LD A,D
7B = LD A,E ...
7C = LD A ... ,H
7D = LD A,L
47 = LD B,A
40 = LD B,BRCS HelpThis plea for HELP is related to the RCS screen handling routines thread. To further save space in the current crop of routines its looking like the …
... ]78 ld a,b
A9 lp1 xor c
E6F8 and $f8
A9 xor c ...
57 ld d,a ...
A8 xor b
A9 xor c
07 ...Ghosts n' Goblins loaderI'm trying to put Ghosts n' Goblins onto a +3 disk but struggling to understand the mc loader. Basic loader [code] ink 7 : clear 25000 : load "" cod…
... : XOR 3
65117: LD C, A
65118: LD H, 0
65120: LD B, 176 ... : XOR 3
65360: LD C, A
65361: LD H, 0
65363: LD B, 176 ...
65488: XOR (HL)
65489: LD B, (HL)
65490: LD C, A
65491 ...Venturespeak Helplooking at the code from ZX Computing, October, November & December 1986. How do I make the code do more then 3 letters say 5. and could it be made …
... WAIT XOR A
60025 32085C LD (23560),A
60028 3A795C WAIT2 LD A,(23673 ... 329BEB LD (COUNT),A
60306 0600 LD B,000
60308 4F LD C,A
Scrolling Bi-Colour Engine for 4-Player GamesJust putting this code up for people to have a look at. Far from finished. Should simply compile and run a bit of a demo. Only good for 128K and +…
... /> ;Use an unrolled multicolour processing loop for speed.
;Use wrap ... /> ld e,b ;de = x
ld b,0
ld a,c
add a,a
add a,a ...
add a,a
add a,a ;a ...Unusual custom turbo loaders - with sourcesI have always been fascinated by turbo loaders; my games all feature a TZX version with one of such schemes implemented, and I have been experimentin…
...
LD A,C
XOR 003
LD C,A
LD H,000
LD B,208
LD A, C
XOR 3
LD C, A
LD H, 0
LD B, 208
LD A,
Alessandro Grussu
May 2014
Development
Currah ?Speech channelIt seems to me that it would be nice to be able to send words to the ?Speech with PRINT #5;"Speak English to me, Jimmy" or some such. There really i…
...
speak_2:
ld a, b ; get A back
cp ' ' ; space ... /> cp 65 ; less than 'A'?
jr c, done ; nothing to do ...
xor a
ld (65362), a ; mark
ld (65363), a ; done
They Stole a MillionI noticed that the tzx on the site is missing a Speedlock Block for Part 2. I don't own the original so cant make a perfect tzx, but I did recreate t…
... the site is missing a Speedlock Block for ... interesting to learn how a simple Speedlock 2 block ... LD A,69 XOR (HL) ADD A,239 so I did SUB 239 LD B,A LD A,69 XOR B ... block, anyway I put a second gap between them ... /> Maybe someone could make a perfect TZX but in the ...Better arrangement for video memory?While doing some documentation work for the ZX-Uno project, I compared the advantages of the weird layout of the ZX Spectrum against a linear layout.…
... A
RRA
XOR B
AND $F8
XOR B
LD H,A
LD A,C ...
RLCA
RLCA
RLCA
XOR B ...Z88DK NOOB cplot INK colorHi I am a complete NOOB with Z88DK, I am trying to draw colored circles. How does ink, paper and border work with Z88DK. I started trying to wo…
... )
POP BC ; C = x, and remove x ... ld a,7
and d
ld b,a
inc b
ld a, ... a
xor e
and 248
xor e
ld h,a
ld a ...Flicker-free animationTrying to create flicker-free screen update, but... Where I'm wrong? [url="https://dl.dropboxusercontent.com/s/pfywhfejfmwt2zq/test_128.sna"]Snaps…
...
start:
ei
loop:
halt
call swap_video ... /> call draw_keep
jr loop
; --------------
keeper ... /> xor %0010
ld (swap_video+1), a
ld bc, BANKS
out (c), a
Flood Fill IssueHi Folks, Came across the following Flood Fill routine by John Metcalf: [code]; scanline fill by John Metcalf ; call with d=x-coord, e=y-coo…
... 10 FD
ld c,b 60017 48
ld b,a 60018 47
... 1F
ld l,a 60067 6F
xor e 60068 ... xor e 60071 AB
ld h,a 60072 67
ld a,l ... 60073 7D
xor d ...Can't Get My Simple Code To RunHello again, I'm trying to run the following simple code: [code] org 32768 main ld b, 21 ; x coordinate is …
... /> gameLoop
jp gameLoop ; loop indefinitely
; ... ld a, b ; x position.
rst 16 ; print it.
ld a, c ...Printing text, part MMXIIXI'm pretty sure there's been a zillion threads about this already, and I don't think it's the first one by myself either, but here goes. Proportiona…
...
ld a, c
sub a, e
ld c, a
ld a, d
; Loop for glyph ... c
ld a,b
add a,a
add a,a
add a,a
add a,a
Sol_HSA
December 2018
Development
