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Hacking a game MAJIKAZOHello, I am trying to put a recent game called MAJIKAZO on disk. However, the loader is written for tape only, so I have to find a way how to rewrit…
... , then it loads a code and starts machine code. This is the end ... />
DI
LD SP,0
Why they put ... -
CODE SCREEN$ in MCIs there any way of determining what character is displayed at a certain co-ordinate from machine code like the 'IF CODE SCREEN$=' arrangement in bas…
Is there any way of determining what character is displayed at a certain co-ordinate from machine code like the 'IF CODE SCREEN$=' arrangement in basic? -
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…
... excellent Movin' & a Groovin' machine code screen routines from Your Spectrum ... moved down
LD (IX+0),A ; poke flipped byte
LD C,(IX+0)
LD (IX+0),A
Machine code optimisationI'm geting back into z80 coding and wonder what the best way of showing how efficient the code is. I've got Rodney Zaks book and see there are timin…
... of showing how efficient the code is.
I've ... to determine how fast the code runs?Assembly - Loops bigger than 255Hi, It looks like it's a bit difficult to make loops with more than 255 cycles on Z80 machine code, since the 16-bit decrements (DEC) do not alter a…
... than 255 cycles on Z80 machine code, since the 16-bit decrements ... the high byte:
[CODE]; A simple program to fill ... /> OR B ; If B is 0, then decrease C
JR ... P,loop
RET
[/CODE]
Maybe this is ...Converting an integer arbitrary large binary number into a printable decimal formThis was asked a long ago at the comp.sys.sinclair newsgroup. At that time, I came up with a solution by extrapolating the classic algorithm of suces…
... a try as Z80 machine code implementation, to see if ... proc
ld b,0 ;Flag to not print leading ... ,1
add a,'0'
rst 10h
;BCD db 0,0,0,0,0
;NUMERO db 255,255 ...Self modifying code ??I made a game in C that was mostly accessing arrays and using FOR NEXT loops, I ran out of memory, so I was thinking would it be possible to use sel…
... possible to use self-modifying code so that say 20 FOR ... NEXT loops use the same code?
or 20 array look ... ups can use the same code?
When using C ... always write out all the machine code necessary to do loops and ...DIM DATA and the likeSo...I'm trying to work out arrays in BASIC a bit more and have knocked up the following quick test bed to fiddle about with before trying anything m…
... />
HELP!
[CODE]10 PAUSE 0
20 RANDOMIZE
30 ... /> 190 PRINT x(1)+1[/CODE]NOW look at what SpecBAS can do![img]https://sites.google.com/site/pauldunn/specbas_32.png[/img] Here's the code: [code] 10 WINDOW NEW w,0,0,SCRw,SCRh BPP 32 20 FOR f=1 TO 512 30 …
... 's the code:
[code]
10 WINDOW NEW w,0,0,SCRw ... f
70 PAUSE 0
80 RUN
[/code]
Still ...How did you learn to code on the Spectrum?Got to be honest, as much as I wish I did, I don't know anything about programming. I had a Spectrum (+2 and then +2B) when I was a kid, and my prog…
... ended, I started reading about machine code (in fact one of my ... seeing you all exchange assembly code and wondering how the & ... these guides on how to code, but I can't for ... an "easy" guide called Mastering Machine Code on your ZX Spectrum. Needless ...Timex contended memory timings, the TS2068 kludge board and EXROM at $4000 - $7FFFI haven't seen this documented anywhere yet so I thought I'd share my findings. I've been investigating contended memory timings on the Timex Sinclai…
... which plays beeps using a machine code routine which steps through $4000 ... setting of port F4 bits 0 and 1 or 4 - 7 ... EXROM chip in the standard machine is only 8K long and ...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…
... my knowledge of Spectrum machine code was too scarce to ... .[/url]
[CODE]
; Biturbo 1 loading ... br /> RET
[/CODE]
[CODE]
; Biturbo 2 loading ... A
LD H, 0
LD B, 208< ... 65441
LD (IX+0), L
JR 65451< ...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…
... was such a thing as "machine code". 30 years later i' ... /> ld a,32 ; ASCII code for space.
rst 16 ... ret
xcoord defb 0
ycoord defb 15[/quote ... br />
xcoord defb 0 - initial starting position. of x ...Rom routine for pixel addressDear all, Having my bi-annual 'lets try machine code' project again and have come up with a problem with the pixel address rom routine at 8874. …
... bi-annual 'lets try machine code' project again and have ... PLOT 0,175 with the following code...
[code] ... ld b,175
ld c,0 ... /> rst 16
ret[/code]
The ... B=175 and C=0, shouldn't the accumulator ...Simple bit of machine code not working [SOLVED]ishHi all. It's late and I'm tired and I have no idea why the following piece of code wont display a little smiley face [code]ld hl,udg ld (236…
... why the following piece of code wont display a little smiley ... face
[code]ld hl,udg
ld ... ,126,126,66,60,24[/code]
I'm using ...140 characters Basic game contestHey there, I've announced a new micro contest on my blog (in Czech language only). However, it might be interesting also for the non-Czech/Slovak …
... example:
[code]1 PRINT "Hello world"[/code]
- are 21 ... 48K Sinclair BASIC syntax
[code]1 FOR f=10 TO ...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…
... ?
[code]
/*
* Hello CIRCLE
}
//pause (0); //how to pause ???
}
#endasm
}
[/code]
I am ...New Game (2016 revival): A Yankee in Iraq (1992)Hello everyone, Way back in 1992, I wrote a shoot-em-up called [i]A Yankee in Iraq[/i]. The entire game was written in Sinclair BASIC. Recently, I…
... tips on loading BASIC using machine code can be found here: [url ... ,” “7,” and “8” for directions, “0” for fire, and “9” to ...So it occurred to me; "Why bother with going into 48K BASIC when you can just....wrap the machine code calls inside a 'RST #28;DEFW addr:RET'?" Of course, you DO need a small M/C routine to do that, and ta-daaa, here it is: [cod…
wrap the machine code calls inside a 'RST #28; ... -daaa, here it is:
[code]
DEFB #0D ; hide the ... BC above ^^
RET
[/code]
and here's ... ,67,220,92,239,0,0,201
[/code]
As you can ...Time Gate graphics patchI've rediscovered Time Gate and one thing I don't like about the game is that it's hard to remember what's what in the status indicators. The manual …
... /iiz0fwsorc8ub1g/tg-patchLetters.png?dl=0"]https://dropbox.com/s/iiz0fwsorc8ub1g ... /tg-patchLetters.png?dl=0[/url]
(having trouble ... . I'm no good at machine code but getting better at Boriel ...So what is wrong with this program ?Using those basic copying buffers routines I wrote this spiral animation, absolutely wasteful it is of memory yes, but I'm only just learning machine…
... I'm only just learning machine code. It draws four frames dumps ... /s/nbo63ld0rg8zjhg/Spiral1.z80?dl=0"]https://dropbox.com/s/nbo63ld0rg8zjhg ...how to load machine codeI'm reading Jon Caldwell's how to write Spectrum games but can't enter the code! Here's an example:_ LD BC, (score) Call 6683 I tried putting…
... but can't enter the code! Here's an example:_ ...New Preview Demo - Vegadvent Adventure Maker for the ZX VegaHello, I'd like to share with you my latest title. It's an adventure maker for the original 2015 model Vega and a work in progress. The idea was t…
... 's compiled BASIC for version 0.1 but, I intend to ... and if necessary with 'proper' machine code as time goes on (e ... /s/3zewbpwjuwj1m13/Vegadvent.zip?dl=0"]HERE[/url].
Please ..."ZX80 Brain" RPN CalculatorIt is at times like [url=https://www.worldofspectrum.org/forums/discussion/54176/depression]when threads such as this are posted[/url] that I get the…
... the keypress with LET i=CODE INKEY$, then z(i) ... means, I know nothing about machine code, and I'm never ... Sinclair RPN calculators and redefine 0-9, E and + to ... e, set to either 0 or 1. d=1 ... and e back to 0 once the ENTER key ... INT o THEN LET d=0
IF oINT o ...The trouble with good code isLots of times I've come here to ask for help and always got it pretty promptly. Which is wonderful and one of the reasons why I don't think there's a…
... trying to learn hex and machine code until I have a thorough ...URGENT / IMPORTANT: BANDERSNATCH (QL MIA)This is the BEST dump I can do on 5 different Bandersnatch MD's I found until then: https://www.dropbox.com/s/t9fws8qlmek2ng4/bsnatch_bk?dl=0 Z…
... .com/s/t9fws8qlmek2ng4/bsnatch_bk?dl=0
Zipped with a ... BAD on the 2 principal machine code parts.
This Bandersnatch ...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…
... John Metcalf:
[code]; scanline fill by John Metcalf ... br /> jp (hl) 60102 E9[/code]
Thought I ... program:
[code]100 CLEAR 60000
110 ... H$;" ";
170 LET H= CODE H$(1)
180 LET ...Custom Menus on the ZX Spectrum +3Today, my Friends, i have the pleasure of presenting a program i have written which gives a set of custom menus on the +3. The main features of my p…
... : permitting the use of a Machine Code Monitor (MONP3 from the HiSoft ... -3/BertoMenus_V0.1.dsk?attredirects=0&d=1"]BertoMenus_V0.1 ...
