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SP1 and memoryWhile developing my program, I've run into memory related issues and haven't (yet) run into any advice over how SP1 uses memory. The examples all sb…
... .cgi?id=0024051"]Sgt Helmet Zero[/URL].
Edit: I ... see from the Sgt Helmet Zero source code that that was the ... -
playing sound samples from Boriel's zxbasic-compilerfirst of all, sorry if it sounds confusing if i'm posting this thread here instead instead of at Discussions:SinclarBasic it's because this is more …
... just for kicks:
[code]
; Uses PWM techniques to ... )
ei
ret
[/code]
noptable contains ... where the output goes to zero. One loop iteration takes constant ... -
probably a stupid question about RST16I'm using the 'hello world' code borrowed from [url=http://equant-retrochallenge.blogspot.com/2008/07/zx-spectrum-assembly-programming-under.html]her…
... if you need to print zero in an AT is to ... the position to zero but isn't a zero... The AT routine ... /> You should have a control code first saying the next two ... like me where you wrote code to change the INK and ... -
Add horizontal hardware scroll to ULA+In this case we must read a bit in the ULA+ for test if supported. And the future software that uses it must have to branch: 1. If hardware scroll i…
... .tap[/url]
Source code here:
[url]http://antoniovillena ... these bits are different than zero, the region at 5b20-5b37 ... -
Add horizontal hardware scroll to ULA+In this case we must read a bit in the ULA+ for test if supported. And the future software that uses it must have to branch: 1. If hardware scroll i…
... .tap[/url]
Source code here:
[url]http://antoniovillena ... these bits are different than zero, the region at 5b20-5b37 ... -
Is it possible to access the +3 disk drive via m/c in USR0 mode?Is it possible to access the disk drive of the +3 via m/c +3DOS calls when running in USR0 mode? I ask because I'm having an awful lot of trouble ge…
... />
Here's the code from ROM2 where it always ... crashes at 0x217f.
[CODE]; DD_L_OFF_MOTOR
.l2164 push ... a
ld (timeout),a ; zero timeout value
ld a ...
ret
[/CODE] -
Up/Down Left/Right scrollCan anybody give a newbie some pointer to simple one char scrolling by pixel? I've looked at a lot of resources, but as you can imagine, it's all a …
... row:
[code]
sprite data: LLLLLLLL ... ???LLLLL LLLGGGGG GGGXXXXX
[/code]
G is ... like this:
[code]
; the setup
... zero
ld de,sprite_definition_address
loop: ; or repeat this code ... -
Up/Down Left/Right scrollCan anybody give a newbie some pointer to simple one char scrolling by pixel? I've looked at a lot of resources, but as you can imagine, it's all a …
...
Here is the code only :
[CODE]draw_face ld de,16384 ... boring bit :
[CODE]draw_face ld de,16384
zero, has 1 added to ... /> ;ahhh....a check for zero...what does that mean? It ... it it now holds zero - so the zero flag is set) ... -
z88dk stdio fopenI'm trying to write a fcntl library, based on the p3.lib one. Looking at fopen(), it calls freopen_z88() which turns the mode string into mode and f…
... to this RFC
[CODE]
Request For Comments
O_TRUNC truncate to zero length
O_EXCL error if ... ;path=%2Ftrunk%2From%2Fvfsinterface.txt[/CODE] -
z88dk stdio fopenI'm trying to write a fcntl library, based on the p3.lib one. Looking at fopen(), it calls freopen_z88() which turns the mode string into mode and f…
... look like this:
[CODE]The oflags will be a ...
O_TRUNC = 0x0200 truncate to zero length
O_EXCL = 0x0400 error ... to 0x8000 are not assigned[/CODE] -
which zx-spectrum games uses 1bit sound samples?hi! I'm looking for zx-spectrum games using 1bit sound samples. Compairing with msx, which has far less games available than zx-spectrum, there are f…
... of Spanish is next to zero.
Woah! The 3 ... different rate to what my code is running at, leading to ... -
What memory address?If you poke 96 and 236 what would the memory address be? I've forgot how to work it out!!! :-?
For a non zero number (zero is trivial), you can also do:
[code]RANDOMIZE number: LET lsb=PEEK 23670: LET msb=PEEK 23671[/code]
But this has the side effect of initializing your RNG to a certain number, which you may not like. -
Z80 Cross-assemblersI need to build some code which contains sets of routines which run at one address but are stored elsewhere. Unfortunately, neither of the assembler…
... ORG directive specifying where normal code starts, and another one @ ... 00 C0, followed by 16370 zero bytes (or FF bytes) ... above becomes:
[code]
.phase 8000h
LD ... .phase 0C000h
RET
[/code]
and that does ... -
BREAK from GOSUBHere's another one. Just in case you wanted to break out of multiple GOSUB levels with a single command, here's a routine to do it, tested on all mod…
... levels at once.
[code]
RETSUB: LD HL, ... AND A ;error if not zero
JP NZ, $1F36 ...
inc a ;reset Zero flag
push de ... all levels
[/code] -
How to start a new game?I know this might sound really stupid... but I've always wanted to make a spectrum game, but no zero of programing... is there any "making speccy gam…
... a spectrum game, but no zero of programing... is there any ... before you even start to code... This would ideally occur independently ... -
Xor-shift random number generator for Z80[QUOTE=Patrik Rak;320244]Come on, people, [URL="http://www.jstatsoft.org/v08/i14/paper"]xor-shift generators[/URL] devised by Marsaglia, that's the w…
... random values returned are always zero irrespective of the SEED value ... values tend to be non zero and random. This only happens ... program reloaded.
[CODE]100 REM
110 REM ... ,0
201 C9 ret[/CODE]
Have I ... -
Xor-shift random number generator for Z80[QUOTE=Patrik Rak;320244]Come on, people, [URL="http://www.jstatsoft.org/v08/i14/paper"]xor-shift generators[/URL] devised by Marsaglia, that's the w…
... start. And by choosing non-zero values for each byte you ... could not understand why my code was acting strange until I ... the first two values were zero. :wink: I suppose another alternative ... -
Alkatraz protection systemI recently became interested in the Alkatraz protection system, a very widely used tape protection (a infoseek search returns more than one hundred r…
... 2 Pulse 714
Zero pulse 564, One Pulse 1129 ... 2 Pulse 632
Zero pulse 560, One Pulse 1124 ... 2 Pulse 714
Zero pulse 564, One Pulse 1129 ... states.
The Pilot, Zero and One pulse lengths are ... /> I provided the source code so that anybody can check ... -
Xor-shift random number generator for Z80[QUOTE=Patrik Rak;320244]Come on, people, [URL="http://www.jstatsoft.org/v08/i14/paper"]xor-shift generators[/URL] devised by Marsaglia, that's the w…
... />
This is what my code looks like now (this is ... rough test program):
[CODE]...
270 LET b101=0 ... /> 380 PRINT b101,b142
...[/CODE]
The idea of ... . The code fails as you get a value of zero generatred. Should ... -
Xor-shift random number generator for Z80[QUOTE=Patrik Rak;320244]Come on, people, [URL="http://www.jstatsoft.org/v08/i14/paper"]xor-shift generators[/URL] devised by Marsaglia, that's the w…
... now looks like:
[CODE]100 REM Fast
110 ... 201
830 DATA 999[/CODE]
It seems to ... -
Create a new microdrive cartridge image formatHi there, I'm working to emulate the IF1+Microdrives in JSpeccy.I've found what the "classic" MDR format ins't capable to store all the required inf…
... byte flag which is non-zero is the cartridge is write ... much more complicated because the code must "invent" while reading the ... -
Games that never end...?I'm not talking about games that loop back to the start once you get to a certain point, but games that cannot be 'completed' [url=http://www.worldo…
... cycles back to 1 (or zero)?
I'm going ... a quick poke in your code to test this ;-) -
Teodoro no Sabe VolarIt's out! [URL="http://www.retroworks.es/php/game_en.php?id=6"]Go and grab it![/URL] Comment here on in our blog...
... have time lately...close to zero, except these last 4 days ... as fast as pure machine code, but in 3 minutes the ... -
problem with RND (or maybe INT)I'm using this statement: LET m=(INT (RND*sn)+k1)*k2-k1 to give a pointer m to a 2-byte segment of a string l$. Items k1 & k2 are integer constants…
... value. As the STEP is zero the controlling variable never changes ... being zero which is important. It allows a section of code to ... -
problem with RND (or maybe INT)I'm using this statement: LET m=(INT (RND*sn)+k1)*k2-k1 to give a pointer m to a 2-byte segment of a string l$. Items k1 & k2 are integer constants…
... 's just the step being zero which is important.[/QUOTE]
code, but if I saw someone ... -
A z88dk + sp1 demo (with source)Since nowadays people are still wondering about how difficult it is to make something in z88dk, I thought I just put a very simple demo to show how e…
... you insist on rewriting sprite code every time!!) limits how much ... you always start at ground zero you will never get past ... , graphics drivers, C/C++ library code, etc.
[quote]
code. They reuse their own sprite ... -
Using ATTR detection in machine codeIs there a ROM routine that can be called that reads the ATTR value of a co-ordinate?
... I'm sure :-)):
[CODE]org 33000
call attribute_address ... screen
cp 0 ;if zero do the following
jr ... z,miss ;if a is zero we are already pointing at ... 16
colour defb 68[/CODE] -
z88dk sticky?I've just tried to PM Alcoholics Anonymous and couldn't because "Alcoholics Anonymous has exceeded their stored private messages quota and cannot acc…
... reference count is not yet zero, the FD* is not deallocated ... could be implemented by library code that repeatedly calls PUTC) or ... mind is maximum reuse of code -- dividing things up into ... ] for the editing facility, modular code for editing separate from the ... -
Loading the display with data from memoryTrying to load part of the screen(4k's worth) with data from memory location 53000, I've written this routine, but it doesnt work... [I]ld b,4000 ld…
... for block operations.
[CODE] ld bc,4000
ld ... , decrements 'bc', stops when bc zero
ret[/CODE] -
The curious case of the vanishing zerosRight, I'm back for more help guys This time I think I've figured out the code ok....but still it fails - well it works but only once... Basically …
... required data statements in your code?
As for the ... the Vanishing Columns, the leading zero in binary shouldn't really ...
