-
Hooky - hook ZX ROM and rewire RST and NMI to RAM - rantThis is a rather long rant. Not for short tempered. :) The objective is to hook into RST "vectors" and NMI on a Spectrum without affecting the normal…
... br /> 0x0001 XOR A ; A=0
0x0002 LD DE,#0xFFFF ; ... ...
0x11CB LD B,A ; B=0
0x11CC LD A,#0x07 ; A=0b00000111
0x11CE OUT (FE),A ... 0x11D0 LD A,#0x3f ; ROM end 0x3f (ff)
0x11D2 LD I,A ; ... -
Help with Manic Miner tweaksPlease. :) This is the Software Projects version, simply as I had it to hand. [B]Problem 1:[/B] I've learned a bit (actually quite a bit) and manag…
... /> LD A, 8 ; 37117 62 8
LD (L33880), A ; ... 37119 50 88 132
LD A, (L33879 ... A ; 37125 60
LD (L33879), A ; 37126 50 87 132
L_9109: LD A ... 36823 32 17
LD A, (L32877) ; 36825 58 ... -
Why no PLOT, etc. on bottom two lines?I was pondering if there was any way to get PLOT, etc. to address the full screen from BASIC without having to write a few lines of assembler to bypa…
... BASIC without having to write a few lines of assembler to ... />
$22AA PIXEL_ADD LD A,$BF (instead of LD A,$AF)
then ... -
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.…
... /> BucScan:
ld a,(hl)
ld (de),a
inc l
XOR B
LD H,A
LD A,C
RLCA
a
rra
ld h,a
ld a,c
and $F8
ld ... l,a
ld a,b ... -
Help with Assembly - DEFB, etc.Dear all, I'm going through Jnathan Cauldwell's tutorial and find myself scratching my head at part I can't find a decent explanation of anywhere! E…
... = 1)
[code]
ld a,2 ; upper screen
call ... 5633 ; open channel
ld de,string ; address of string ...
ld bc,eostr-string ; length of ... -
LOAD "" CODE in machine code/store 128 bank dataHow do you LOAD "" CODE from machine code? I have written the following MC routine that fits into a REM statement in a basic program. I want to cal…
... /> ld a,96
ld (23606),a
ld a,233
ld (23607),a ;chars
ld a ... ,111
ld ... -
Pixel level collision detection[SIZE=3][FONT=Calibri]I need to do some pixel level collision detection. Assuming I have a byte of my ?player? sprite in DE and a byte of screen to t…
... collision detection. Assuming I have a byte of my ?player? ... sprite in DE and a byte of screen to test ... /> [CODE]
ld a, (de)
ld b, a
xor (hl)
a better / faster way to ... I know the player and a ?bad? tile are ... -
IX+n and self modifying code and pasmoI'm using pasmo and if I wanted to use ix+n like this: (ix holds the position to a sinus table) ld (symbol), a LD a, (ix+symbol) What I want to do…
... position to a sinus table)
ld (symbol), a
LD a, (ix+symbol ... to do is to use LD a, (ix+n), but declare n ... as a variable, and modify it time ... used like this (I'm a total newbie).
I ... -
Games that will be 10 in 2015!Time yet again to make some of you realise just how fast time is passing us by as I show a list of games that are going to be 10 this year! :D [b]R…
... us by as I show a list of games that are ... 2
F.E.A.R. (PC)
The Warriors ... this lot will also reach a decade! :o
[b ... -
ZX rom type detectionHere is routine for fast detection of zx rom / computer model. [URL="http://velesoft.speccy.cz/other/ZXROMDETECT.zip"]http://velesoft.speccy.cz/othe…
... A
; LD B,#7F
; LD A,#10
; OUT (C),A
LD ... BC,0
LD A ... -
Return to basic from sna created by Z80 compilerHow can I go back to basic when running sna created using Z80 Assembler ([url] http://www.worldofspectrum.org/utilities.html#crossass [/url])? For e…
... /> ld de,16385
ld bc,6143
ld a,255
ld (hl),a
ldir
skok: ld a ... ,127
in a ... -
Strange keyboard port reads on 48+Hi all, I don't know whether it was already discussed (I also searched forum, but there are too much of results searching "48k keyboard" so I didn't…
... should.
I asked a friend to test it on ... 3270
ld bc,+
ld a,239
+ in a,(254)
and ... -
SpecBAS 0.830 Released!Hi guys - A new official release of SpecBAS has been released. The full changelog is below, but for now here's the download: [url]https://sites.goo…
... AND/OR/NOT
A small bug in string slice assigns ... that caused a crash in multistatement ... at once
Fixed a small bug in package handling that caused ... be used as a direct expression
A long-standing bug where GOSUB ... -
SPIN AssemberHi, I'm in the early stages of learning assembler, and am now looking at some tutorials from Toni Baker in ZX Computing: [url]http://wos.meulie.net…
... ),00
LOOP:
ld A,"*"
rst 10
jr ... /> Can anyone help? Is there a better assembler to use?
draw single pixel in the borderI have problems with drawing in the border. I can get it to draw a line ,but it always becomes a line and not a single pixel. <br><br>rept 3580 <br…
... a line ,but it always becomes a line and not a ... br />
ld bc,0x00fe
ld a,3
< ... br /> out (c),a
out ... This screen also shows a second question. You can ... it possible to get a multicolored block using the ...Back to basicsOK, having had enough of constant moaning about the look of the forums, I have done what I was going to do first time - because I am right, and am al…
... .
This is a basic design - if anyone wants ... to produce a design around it then feel ... forward then we will run a poll.
I ... to work from for a new design once one ... meantime, unless it is a style bug, then there are no ...Double height text...<p>Is here any good routines for printing a font double height?</p><p>I've concocted this ridiculous routine but I'm sure it can be done much better.…
... loop ld a,(hl)
x1 ld (16384),a
x2 ld (16384+256),a inc ... hl
ld a,(hl ... /> ld a,(hl)
x5 ld (16384+1024),a
x6 ld (16384+1024+256),a ...Strange behaviour on laptop/Linux/Wine/ZXSpinRecently, I've purchased a new laptop (HP Stream 11-d015ns). It came with Windows 8.1, but soon it was changed to Debian testing to make it run faste…
Recently, I've purchased a new laptop (HP Stream 11- ... 't know if it is a "feature" of the laptop keyboard ... apps it works fine), a Wine bug or a ZX Spin one. Did ...2TB Drive Dieing.Well, after 5 1/2 years of service my humble Samsung Spinpoint 2TB drive has now issued several S.M.A.R.T warnings and has now been retired. I …
... issued several S.M.A.R.T warnings and has now ... is not long for a drive, I usually retire ... I used to work for a publisher in Oxford, their ... was like (Sonically) being inside a Dyson hoover.
... So I have a retired 2TB drive that still ...Divide by 16 problem...I think.I *think* I have a problem with division. Now, this is not for the Spectrum but it [i]is [/i]for another Z80 platform. I'm converting [b]Speccies …
I *think* I have a problem with division. Now, this ... out if I've made a mistake - or come up with ...
ld a,l
srl a
srl a
srl a
ld h ... ,0
ld l,a
Could use some help improving some controls.Back when Dingo was released many people said they had problems controlling it, so I've decided to improve the controls on it, so you no longer need …
...
[code]right: ld a,(PlayerCoordY) ;Is it at all ... Right2: ld a,(PlayerCoordX)
inc a
inc a
ld (PlayerCoordX),a
RightStop: ld a,232 ;Can't move further ...Code structureHi all, I'd be interested in opinions on the neatest way to do this. I've got a print string routine in which 0-31 are reserved for control codes, …
... do this. I've got a print string routine in which ... ;ix pointing at string
ld a,(ix+0)
cp 32 ...z80 assembly helpEver since I was a child I wanted to program my zx81 then my zx spectrum + 2. However, it was such a mystical beast and I only ever used BASIC not kn…
... /> rst 16 ; print it.
ld a,(xcoord) ; vertical position.
rst ... 16 ; print it.
ld a,(ycoord) ; y coordinate.
rst ...ANN: Tipshop updated Monday, 05 October 2015Monday 05 October 2015 Better late than never, eh?! * Archie Robins provided a ton of new POKEs. Corrections for Munch Man; updates for Silent S…
... ?!
* Archie Robins provided a ton of new POKEs. Corrections ... Wild and new POKEs for A.R.C.O.S., Apulija-13 ... 'N Rescue, Captain Drexx, Catch a Hare,
Chard, The, Charm ... Harry,
Hombre que susurraba a las balas, El, Horace Miner ...How to Write ZX Spectrum Games - Jonathan CauldwellHello, I'm trying to improve my very basic level of assembler by reading the Jonathan Cauldwell guide. I'm fine with the basics LD, CP, and JP,…
... 'm fine with the basics LD, CP, and JP, but I ... ]org 33000
main
ld a,2
call 5633
loop
ld de,string
ld bc,eostr-string
The I register and IM 1Hi al! I've been doing some coding, replacing the BASIC ROM with my own code and upon examination of a few 16Kb cartridges, all the ones I've look…
... code and upon examination of a few 16Kb cartridges, all the ... />
[code]ld a,63
ld i,a
im 1 ...Drawing some spritesI figured I want to draw some sprites. My target was to do a 16x16 masked sprite. There's no clearing here, just drawing the sprites. My first ite…
... de,hl
ld a, (de) ; load pixel from ... screen ptr
ld a, (de) ; rinse
and ... inc de
ld a, (de) ;repeat
and ...Mr. Jido makes some noiseA little something to analyse and discuss for you. [code] ORG 60000 ; RND Generator: RND LD HL,EARTH LD A,(WIND) ADD A,L LD …
... A
LD (WIND),A ;Preload Variables
LD (RANDOM),A
LD A,255
LD (FIRE),A ...
LD ...
