-
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…
... ld a,b ;string length in BC. DE points to string ... string
ret
endp[/code]
For example, ... would do:
[code]
ld c,12
ld b ... -
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…
... , opened it, pasted the same code in location 40000 and it's ... the 16-bit value stored in 16-bit register BC. Or ... 40000, and set a breakpoint in ZXSpin debugger at address 40000 ... ). If your program changes register C to $63 (99), when you ... -
Hi all.Been lurking around here for a long, long time with the odd post. Suppose I'd better introduce me'sen properly with a hi! Spectrum owner from 1983 …
Why program in C where anyone can read and understand your code after a while, when you could be programming in C++ and give yourself a maintenance contract for life? -
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…
... depend where you place this code in memory.
PRINT ... BC which is 256*B+C.
If you ... set only C without B your result will ... will get 100
LD C,100
RET
... br /> RET
LD C,100 -you will get random ... -
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…
... depend where you place this code in memory.
PRINT USR ... BC which is 256*B+C.
If you set ... only C without B your result will ... USR 40000 will result in 40000 when the code at address 40000 ... -
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…
...
ret
[/CODE]
[CODE]CLS
... ATTRIBUTES to the value given in ?a?.
... ldir
ret
[/CODE]
[CODE]PRINT1
This ...
ENTRY a = CHARACTER CODE
PRESERVED c
EXIT b = 0 ... -
Fast Z80Todays Spectrums are fast as hell and few software utilises this. Z80 in ReVerSE runs at 42 MHz, in Speccy2010 at 28 MHz, in Pentagon 2.666 and in N…
... it :) You can write programs in C or asm to use the ... address space. The compiler inserts code to perform bankswitching for each ... programmer such as sectioning of code and data and instructions to ... -
Abbaye des morts[url]http://www.locomalito.com/juegos_abbaye_des_morts.php[/url] Looks like Spectrum, sounds like Spectrum, but it's not a Spectrum ('cause no colou…
... . Rewritten from scratch in C language. I put all the code, tileset, maps ... license) :
[url]http://code.google.com/p/abbaye-for ... />
If I can help in any way, please ask me ... -
Abbaye des morts[url]http://www.locomalito.com/juegos_abbaye_des_morts.php[/url] Looks like Spectrum, sounds like Spectrum, but it's not a Spectrum ('cause no colou…
... . Rewritten from scratch in C language. I put all the code, tileset, maps ... license) :
[url]http://code.google.com/p/abbaye-for ... />
If I can help in any way, please ask me ... do not have unfortunately experience in a similar -
C.G.D - Classic Game Designer[b]UPDATE: August 07, 2013 AN UPDATED VERSION OF CGD IS NOW AVAILABLE, DETAILS HERE: [url]http://www.worldofspectrum.org/forums/showpost.php?p=7155…
... /> You can poke different values in:
POKE 33980,xcor ... =Einar Saukas;712727]BTW the C.G.D. loader program contains ... all my testing dumping the code in from the SPIN assembler, and ... -
Games/Programs making use of DivIDE featuresHello :) I have a question: I may be wrong, but it looks like the DivIDE and similar interfaces for the ZX Spectrum are almost exclusively used for …
... systems. It is written in C for maximum portability but places ... they are written in C. The web server, in particular, is dead ... is fundamentelly different is the code underneath the system. SymbOS ... contiki's, again without investigating in detail) and so on. ... -
Games/Programs making use of DivIDE featuresHello :) I have a question: I may be wrong, but it looks like the DivIDE and similar interfaces for the ZX Spectrum are almost exclusively used for …
... systems. It is written in C for maximum portability but places ... suited to the hardware in question but Contiki is ... , its apps are written in C, and it provides a ... lot of them tied up in less-than-useful, but ... has bugs in it. Contiki's IPv6 code was written ... -
generating a pre-defined list in an un-defined sequenceI've decided to become a drunkard, to which end I've been drinking a whole bottle of beer in one day (whereas normally I'd make it last 2 or 3 days).…
... RANDOM16" and added this:
[code]
RANDOM16:
call ... ,(SEED32+2)
ret
[/code]
--
... [/url]
The code in the paragraph regarding the Richard ... head-or-tail of the C code, so I wrote a ... -
Fastest Z80?Hi , Could somebody explain more about the Kawasaki Z80 33 MHz to me? Is it fully backwards binary compatible with older Z80s and could it be used a…
... /> For example IN A,(C) is really IN A,(BC) as C provides A0 ... to A15.
The code in the ROMs of the ZX81 ... -
Confounded DEF FNCan anyone see why this is going wrong? I've been tinkering with it since tea time and got nowhere. [code] 2 DEF FN t$(n,t,d) =STR$ INT (n/t)…
... 's better to do this in assembler than work on that ... what is required in pseudo code (or in something like C)? It's splitting ... operator...
Using sprintf in C would be easy...
in 1/50th's of a ... -
Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... />
.jubilee_pilot:
ret c ; leave all unset (black) on ...
macro border
jr c,.high_edge ; leave all unset (black ... selected
endif[/CODE]
In the main loader, the ... -
RND cyclical behaviourGood evening. I'm playing with RND function to show its cyclical behaviour, i.e. after 65536 calls to it, the next one will return the same value of …
... it's finished.
[code]
RNDFUN: ld b ... ,$1D ;B= calculator code for VAL
rst ... $023F ;address of "RND" code in key table
defb $01 ... sbc hl,bc
jr c,RNDFUN
ld (23677), ... -
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…
... #6683;print whatever is in register A[/QUOTE]
... routine, and the comment in the ROM disassembly says ... lead to the number in the BC register pair ... br /> It prints the number in the bc register pair rather ... 'bc':
[CODE]
ld c, a
ld b ... -
Mirroring UDG'sJust wondered is there a quick an easy way of mirroring UDGs (byte values)? i.e. BIN 11110000 becoming 00001111 etc.
... , bit faster:
[code]
ld c,1
loop:
rra
rl c
jr nc,loop[/code][/QUOTE]
Hmm ... 's slightly quicker to type in: rra v. rrca.) -
Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... a time:
[CODE] ld c,0 ; we need 256 pulses ... recent single edge counter
;; in the accumulator, we now have ... timing_constant_pilot ; finger in the air
jr nc,.detect_sync_loop[/CODE]
Border art viewerRecently, we were working with diver/4d on border art. The idea was to push the techniques of drawing on the border to the limit and to see, how much…
... : the undocumented instruction
[CODE]out (c), 0[/CODE]
actually outputs #FF ... into the port in BC on ... computer with AY sound chip. In the current beta, I simply ...Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
...
I do software development in C# and SQL for my day ... is accustomed to being experienced in one's field.
... /> My plans for 47loader are, in order:
[ ... time taken for the code to execute is a ... of using pilot pulses in the data stream to ...Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
...
[CODE]in a,(c) ; 12T[/CODE]
with
[CODE]in a,($fe) ; 11T[/CODE]
IN address. Not a problem though ... /> I've added some features - code execution, border tweaks and a ...Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... [CODE]in a,(c) ; 12T[/CODE]
with
[CODE]in a,($fe) ; 11T[/CODE][/ ... was then mentally locked in using the C register, forgetting that ... Whether I use IN A,(0xFE) or IN A,(C), you're right ... ve added some features - code execution, border tweaks and 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…
... /> Lets all get high and code in hex.
I will ... Vim user.)
When in college there was a instructor ... wanted when writing a function in C
.
(just to infurate ...The Pros and Cons of "alternative" assembler syntaxContinuing from [URL]http://www.worldofspectrum.org/forums/showpost.php?p=720754&postcount=72[/URL] [QUOTE=u6c87;720754]But that wouldn't change if…
... old Joe wants to use in their code. So it's a ... to compile unmodified code. However, sdcc has very little in the way ... . What it has is written in C and only very few routines ... of C code than z88dk but z88dk's code will be faster and (in ...The Pros and Cons of "alternative" assembler syntaxContinuing from [URL]http://www.worldofspectrum.org/forums/showpost.php?p=720754&postcount=72[/URL] [QUOTE=u6c87;720754]But that wouldn't change if…
... specific, share considerable amount of code because they make use of ... 8-bit programmer whether writing in C or z80 can pretend to ... z80 target with only some code in the backend modified for a ... was made tractable because the code was in C and used a library ...The Pros and Cons of "alternative" assembler syntaxContinuing from [URL]http://www.worldofspectrum.org/forums/showpost.php?p=720754&postcount=72[/URL] [QUOTE=u6c87;720754]But that wouldn't change if…
... made tractable because the code was in C and used a library ... . Even without any source code whatsoever, it was done ... pretty easy to write code that can be re- ... the CPC and Speccy in pure assembler without having to ... use C, as long as you ...
