-
Who knows how to program a "pathfinder"?Hi all. I like to play games like "Colour Lines" and I think, I will create a version of this game for the SAM Coupe. It looks easy - until this "dam…
... hl),a
jr z,next
ld a,255
ld (hl),a ... noempt
ld a,l
add a,16
ld ... l,a
call check ... br />
check ld a,(hl) ; fetch value near field< ... blocked field
ld (hl),a ; path+1
... -
Fixing Attribute Clash via emulationI'm sorry if this has been posted already, but is there a possibility to fix attribute clash via emulation? I'm not talking about RealSpec or any of …
... colour.
again: inc a ; Increment to next colour.
Add white paper colour.
ld hl, 22528 ; Start ... attributes.
nextch: ld (hl), a ; Store this colour.
... inc hl ; Next attribute.
... -
Game Programming Source Code & Startup HelpHi there, I'm planning on porting an existing commercial title to the speccy. I'm in the process of disassembling the original code and commenting i…
... learning process anyway). As a reference you might also ... /> [code]
; in HL is VRAM address
; ... /> OR B
LD (HL),A
INC L
... ... LD SP,HL ; HL holds address of background graphics
ADD HL,BC ; ... INC H
LD A,H
AND 7< ... -
Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…
... 't normally use. A switch to globals would ... cycles. This subroutine is a good candidate for hand-optimizing ... little savings that add up in a large program. Anyway ... (adriaan's rl(hl)/dec hl unrolled is probably close ... any takers I'll add this to the project, ... -
Game ideaThinking of a game that could enter the Minigame compo I came to the following idea for a game, although it might not fit 1K or 4K: A mazed snake ga…
...
Anyone willing to add his own defined level???
xor a
ld hl,23560 ; LASTKEY
ld (hl),a ; set impossible ... value
nokey or (hl ... -
Getting Lifeguard to workI'm struggling with this Muliface utility to find infinite lives cheats. I can get the program to load up, and when I load a game and press the red b…
... follows:
DEC (HL)
LD A,(HL)
CP 2F
HL) then Escape to return to ... W box and clicked Add to set a breakpoint whenever $95EB is ... :
LD HL,95EB
LD (HL),39
So ... -
Compressors are available for Speccys ?Hi folks, although I was an wasn't strictly a speccy coder in the glory days (amstrad & amiga for the most part), I have secides to arse about with …
...
ld a,(hl)
add hl,bc
ld (hl),a
inc hl
ex ... de,hl
jr ...
ld a,(hl)
add hl,bc
ld (hl),a
inc hl
ex ... -
Vector drawing routines.Anybody could point me to some sort of vector drawing package of routines, callable from BASIC? With "vector drawing" I mean to draw 2D pictures with…
... left
ld a,b ; within byte
add a,a
or c ...
or b ; a = incoming pixels ... change
or (hl)
ld (hl),a ; fill byte on screen ... -
Compressors are available for Speccys ?Hi folks, although I was an wasn't strictly a speccy coder in the glory days (amstrad & amiga for the most part), I have secides to arse about with …
...
ld a,(hl)
add hl,bc
ld (hl),a
inc hl
ex ... de,hl
jp ... /> add a,a
ld ixl,a
ret nz
ld a,(hl)
inc hl ... -
help sought with first foray into machine code - pixel scrolldownI have started to code my first machine code program, a simple roadrace game. I've based it around the pixel scrolldown routine in 40 Best Machine Co…
... ;graphic for roadside
ld (hl),a ;print road left side
printroad
ld (hl),a ;print left side on line1 ... to next line through a char
add hl, de ;goto next line ... through a char boundary
... -
Changing the way SCREEN$ is loadedThe way the speccy loads in a SCREEN$ is interesting - top two-thirds first, then middle and finally the bottom, which is due to the way the speccy d…
... ; mask
ld (hl), a ; poke colour
inc hl ; next attribute
drawline: ld a, 0 ; a = screen poke byte
ld (hl), a ; poke to ... address
add a, 32 ; add 32
ld (screenaddress+1), a ; poke result ... -
A scrolling starfield - help needed!I have been messing on my speccy again recently and tried to do a scrolling (parallax - maybe) starfield. I know how to scroll using machine code but…
... 3 most lsb
ADD A,A
ADD A,A ;multiply result by 4 ... L,A ; add the x-coordinate to the low byte of hl ... HL,STARDATA
LD B,0
LD C,A
ADD HL ... ,BC ; add ofset 0-7 ... -
A scrolling starfield - help needed!I have been messing on my speccy again recently and tried to do a scrolling (parallax - maybe) starfield. I know how to scroll using machine code but…
... 3 most lsb
ADD A,A
ADD A,A ;multiply result by 4 ... L,A ; add the x-coordinate to the low byte of hl ... HL,STARDATA
LD B,0
LD C,A
ADD HL ... ,BC ; add ofset 0-7 ... -
A scrolling starfield - help needed!I have been messing on my speccy again recently and tried to do a scrolling (parallax - maybe) starfield. I know how to scroll using machine code but…
... 3 most lsb
ADD A,A
ADD A,A ;multiply result by 4 ... L,A ; add the x-coordinate to the low byte of hl ... HL,STARDATA
LD B,0
LD C,A
ADD HL ... ,BC ; add ofset 0-7 ... -
A scrolling starfield - help needed!I have been messing on my speccy again recently and tried to do a scrolling (parallax - maybe) starfield. I know how to scroll using machine code but…
... 3 most lsb
ADD A,A
ADD A,A ;multiply result by 4 ... L,A ; add the x-coordinate to the low byte of hl ... HL,STARDATA
LD B,0
LD C,A
ADD HL ... ,BC ; add ofset 0-7 ... -
A scrolling starfield - help needed!I have been messing on my speccy again recently and tried to do a scrolling (parallax - maybe) starfield. I know how to scroll using machine code but…
... /> LD D,A
LD HL,STARPOS_X
ADD HL,BC
LD ... (HL),A
YCOORD_INRANGE_D
LD D,A
LD HL,STARPOS_X
ADD HL ...
LD C,A
ADD HL,BC ; add ofset 0-7 to ... -
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…
... ,(HL)
ADD A,55-24
LD L,A
LD C,(HL)
ADD A ... /> LD L,A
LD A,B
ADD A,C
LD (HL),A
Jetpac questionHi all, I just bought a copy of Jetpac off of Ebay and I'm having problems. To start, I'm trying to play it on an issue 2 Speccy with Interface 1, 2 …
... HL ;Increment string pointer
DEC C ;Decrement charcater
ADD A,A ;Shift A ... ATTRIBUTE file
ADD HL,BC
LD A,(QP_ATTR) ; Gett attribute ... ,A ;B=D AND $18
LD HL,$4000
ADD HL,BC ;HL ...Speech reproduction on the Speccy - 2009 style?Thanks to Chapter 33 of [url="http://www.worldofspectrum.org/infoseekid.cgi?id=2000388"]Super Charge Your Spectrum[/url] by David Webb - "Speech Repr…
... A,(DE) ;(TADPCM+..)
ADD A,A
ADD A,A
LD HX,A ;delta
LD (HL),A ... H
ADD A,'TABMID
LD (HL),A
POP HL
INC L ...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…
...
add hl,de
ld (hl),a
inc hl
ld (hl),a
ld ...
add hl,de
ld (hl),a
inc hl
ld (hl),a
;random ... /> add hl,de
ld (hl),a
inc hl
ld (hl),a
inc bc ;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 …
... , a ; low byte to l
add hl, hl ; x2
add hl, hl ; x4
add hl, hl ... /> add hl, hl ; x16
add hl, hl ; x32
add hl, hl ; x64
add hl, hl ; x128
…Z80 compressorIs there one available? Is it any good? Peeps have been suggesting we should look into this, so here's a new thread! I'd do the compressor on the …
... hl
ld a,(hl)
inc hl
ld h,(hl)
ld l,a ; hl ... /> ld b,0
add hl,bc
add hl,bc ; hl = &encoder[c ...tricks to simplify codingWhen i started with programming in assembler i had very simple approach to do things. Just shifting bytes around, doing simple tests and so... Later …
... or the contents of HL.
A great time saver
Turkwel
June 2010
Development
'Hello World' in ASM ?Can someone show how to make the classic 'Hello World' print with ASM code ? I cant figure at this moment how to insert and handle strings with the s…
... /> ld h,a
ld b,#00
add hl,bc
ret ... ,a
add hl,hl
add hl,hl
add hl,hl
ld bc,15360 ;ROM font
add hl ... ,bc
ex de,hl
dup 8
ld a,(de ...How to insert special characters in Basic and ASM ?Look the next picture. [IMG]http://img25.imageshack.us/img25/9479/scode.jpg[/IMG] I dont know how to insert these black and diagonal characters. No…
Well, you can add 'cpl' before and after ld (hl),a in the old code to invert the character. You can use address+7 as start and dec hl instead of inc hl to flip the character vertically.
