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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? -
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…
... it gives me 32867.
[code]
ld l,155
ret
[/code]
When I add ... the beginning, the following...
[code]
ld hl,0
ld bc,0
[/code]
...it seems to work ... -
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…
... 't work anyway!)
[CODE]org 30000
ld b ... 18
ld b,171 ;vertical co-ordinate to be plotted ...
pop bc
ret[/CODE] -
quick RAM copy using LET in BASICI'm in the process of reviewing, revising and refining all the programming tips & utility routines which I've posted on this forum over the last eigh…
... in line 45.
[code]
10 DEF FN p ... around a screen segment
[/code]
--
The ... either side as well.
[code]
44 LIST 45: DIM ... ): PAUSE 0: STOP
[/code]
The vertical bars are due to ... -
How to write self-relocating code using Pasmo?With z80asm, I can write code like this: [CODE] org 0 ; a total lie, but makes the reloc sums work .dest: equ …
... ; target address of relocated code
ld bc,.reloc_start ... ld bc,.reloc_len ; length of code to relocate
ldir ... lots of code
;; lots more code
;; even more code
< ... -
BIFROST* example: "Knights & Demons DX" source codeA package containing the source files of our multicolor game "Knights & Demons DX" is now available for download [URL="http://www.mediafire.com/?hbch…
... ' timer (multiplied by 100)[/CODE]
The ... br /> BIFROSTstart() ' enable BIFROST*[/CODE]
This ... () ' wait for next frame[/CODE]
Even ... -
Scrolling by 2 pixelsWhat is the fastest way of scrolling a Spectrum screen line by 2 pixels left or right? When thinking about it I've come to this simple solution: [C…
... this simple solution:
[CODE]RR (HL)
INC HL ... /> INC HL
...[/CODE]
to scroll it by one pixel ... then doing it again to scroll it by 2 pixels.
trying to read keyboardI have the speccy in interrupt mode 1 I used 'IM1' in assembly language then Im printing the contents of memoryu area 23560 to the screen: [quote] l…
... /> ld a,#22 ; ASCII control code for AT.
rst #16 ... it.
ld a,#10 ; vertical position.
rst #16 ; print ...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…
... ' & a Groovin' machine code screen routines from Your Spectrum ... is noticeably slower than the vertical one because it has ... utterly confusing and wonderful reverser code.
On the ... horizontal
[/code]
Now.. Dr Beep ...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…
... />
Part of disassembly:
[CODE]THE 'MOUSE' ROUTINE
This ... /> 2264 RET NZ Return to vertical movement test.
2265 BIT ... to mouse.
228D RET[/CODE]
Full disassembly here ...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…
... a spectrum in assembly/machine code... No fancy screen shinanagins, ... "/program loader.
[code]
10 LET X=61440 ...
Paired registers
[code]
03 = INC BC
3C
C9
[/code]
returns... 61440...
Squishing code up nice and small then unsquashing it in assemblyI refer of course to data compression. I've done a search and there are lots of good compressors, but I can't seem to find one that works in assembl…
... a short bit of assembly code (exactly what I'm after ...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?Machine code/Assembly language back in the dayHello. Back in the 80s when I was a kid, I didn't learn Z-80 machine code, but I was always curious about it. Just recently I decided to explore Z-…
... attempt at learning machine code on the Spectrum made ... reset and editing the code, which is still waiting ... assembler window. However, writing code on a real Spectrum ... crashing in case bad code is executed? Did they ... who were learning machine code back in the 80s ...Converting Basic code into machine codeIm just interested to know if I can converter a game I've written in basic into Machine code, Is their a program that can do this??
Im just interested to know if I can converter a game I've written in basic into Machine code, Is their a program that can do this??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…
... trick like this:
[code];; load a 4000 byte BASIC ... (23620),1
ret[/code]
Ta-da, BASIC ... total crash. Loading BASIC as code from the 128 BASIC interpreter ... 's the return from machine code that doesn't.
MOVE_M Object Movement Manager for BASICAs moving things around on the screen is usually the slowest part of a game written in BASIC, I've been pottering around with this routine to handle …
... appended to the MOVE_M code.
[code]
10 ... /> 9999 RETURN
[/code]
[code]
; MOVE_M moving ... /> ; Vstep = -1/0/+1 vertical step
; Hstep = -1/ ... /> ; CHR$ = graphic's character code
; 0:1 = direction ...Another vertical scrolling questionwhile talking about w256 x h128 vertical scrolling, are 128k modes have any advantages over 48k models? has extra ram or swappable screen buffer any…
while talking about w256 x h128 vertical scrolling, are 128k modes have any advantages over 48k models?
has extra ram or swappable screen buffer any use on scrolling?Downloading code to physical hardwareHi folks, Back in the day, my devkit was a TRS-80 and I had a simple connector device from the TRS-80 parallel (printer) port to the expansion bus o…
... ways to get PC developed code over to a physical Spectrum ...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 ... write out all the machine code necessary to do loops and ...Assembly code auto optimiserFor my Finders Keepers Plus project I'm considering writing an Assembly code auto optimiser. Way back when I wrote the original FK I considered optim…
... like this
[code]
call SomeSub
... ret
[/code]
could be ... br />
[code]
jp SomeSub
[/code]
... br />
Example
[code]
; My source
;< ...Seeing the code/In emulatorHello, Here is my Noob question. Is it possible to see the code for these games in an emulator? To be able to study the code? I am using the Sp…
Hello,
Here is my Noob question. Is it possible to see the code for these games in an emulator?
To be able to study the code?
I am using the Spectaculator emulator on a PC.
Thanks,
MGet rid of 'Bytes:' when loading codeHow do you hide the 'Bytes:' when loading code? I've tried saving as CHR$ 22 + CHR$ 6+ CHR$ 0 (a blank part of the loading screen) but it still appe…
How do you hide the 'Bytes:' when loading code?
I've tried saving as CHR$ 22 + CHR$ 6+ CHR$ 0 (a blank part of the loading screen) but it still appears at 3,0 and disrupts my screen!Code to test if a rectangle is in a rectangle[SIZE=3][FONT=Calibri]I am looking to write some code that will check if a rectangular shape is outside or overlapping a second rectangle. If the sma…
... am looking to write some code that will check if a ... have concocted the following sudo code to achieve this outcome:[/FONT ... , has anyone got some Z80 code that already does this? I ...SpecBAS 0.800 Released!Hi folks, it's that time again for another release. I was going to add a few more features, but I have other projects on the go at the moment, and it…
... of the following:
[code]
Added:
... fix
Forcing a SCROLL? prompt with a large font ... screen might have caused a Scroll? message after all
... , which resulted in erroneous "Scroll?" prompts
[/code]
Enjoy ...Code analysis on SNA filesI was wondering if anybody has attempted to convert all TZX/TAP files into SNA files? I would prefer SNA files as they're easy to use and search from…
... /> Basically the first bit of code analysis I've been doing ...About how z88dk generates code and makes room for variables.When you attempt to code games for the 128K models using z88dk in C you need to somewhat control where variables are stored in memory. I thought tha…
... ;
unsigned char *script;[/code]
If ... for example:
[code] script_result = 6;
script_something_done = ... = 8;
script = 9;[/code]
I can see ... looking at the generated code:
[code]ld A, $ ...Thunderjaws - little secret discoveredThere is game called Thunderjaws, or maybe better to say a demo as full game was never released: [url]http://www.worldofspectrum.org/infoseekid.cgi?…
... peek a bit into the code.
What did I ... full game buried in the code, locked with a single poke ... design, done for 8 pixel scroll while the actual game has ... 4 pixel scroll.
Unfortunately that's ...Autorun code in an emulator?[FONT=Calibri][SIZE=3]I am using Tommygun and pasmo to develop my game. This works fine but each time the emulator is started and file loaded I then …
... type a line of code to execute my code. Is it possible ... it will auto run my code?[/SIZE][/FONT]
