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Couple of questions...Howdy, 1. Is there a decent way to get a random number in BASIC/MC? I've been using LET a=INT(RND*2)+1 but the numbers tend to stay at 1 or 2 most …
... would also ensure that the R register is randomised a bit.. I ... -
Hidden Features In GamesI'm sure there was a thread like this somewhere - sorry, but I can't find it. Hidden stuff in games. In "Mikie" there is a hidden bonus in each of …
... for emulator testing with the "R" register usage - if your emulator gets ... -
The Goldfinch updates thread([url=http://www.worldofspectrum.org/forums/showthread.php?t=25034]original announcement thread here[/url] - I figured it was worth starting a new to…
... interrupt mode, save the I register then point it at my ... code for capturing interrupt and register state[/url], "borrowed" from FATware ... some effort to capture the R register, despite apparently not using it ... -
szx to real spectrum?Hi, I could not find something about this, but is there any tool that can convert the szx snapshots to tap (for example) or any other way to load th…
... you need to get the R register right? Do you need to ... -
szx to real spectrum?Hi, I could not find something about this, but is there any tool that can convert the szx snapshots to tap (for example) or any other way to load th…
... you need to get the R register right? Do you need to ... -
When would you use LD A,R ?Can anyone tell me a practical use of LD A,R and LD R,A I am confused when you would need to use it? Cheers
You can use R register for counting loops. So you don't need a INC or DEC instruction and the loop can be faster.
Ultra-speed loading of k7zx uses these LD a,r and LD R,a instructions. -
Adjusting your code for screen refreshingOk, I'm aware that I should know it already after writing 5 Spectrum games in machine code but interrupts and screen refreshes were always my weaker …
... set bit 7 of the R register (see thread [url]http:// ... [/url] "what is LD A,R used for?").
... , be sure to reset R so you can detect the ... framecounter, setting bit 7 of R when it hits zero. In ... , 3 or whatever and clear R.
In addition, ... -
Similar GamesI was just wondering with there being thousands of games if theres a lot of games that are similar to The Great escape and Where Time Stood Still sin…
[QUOTE=Necros;453395]He is, but this is WoS. Nothing ever stays on topic here and everything eventually develops into a discussion about crisps, sheds or Maria Whittaker... :p[/QUOTE]
or what the "r" register actually does :-o -
Similar GamesI was just wondering with there being thousands of games if theres a lot of games that are similar to The Great escape and Where Time Stood Still sin…
So what does the 'r' register actually do?* :D
*Don't answer that though. It's sunday. -
ula bookula book is here: [url]http://www.zxdesign.info/book/[/url] can i post sam coupe stuff here - she kind of is a speccy if you stuff the speccy rom i…
... way that setting the I register to 40h-7Fh was not ... the same value to the R register!
Yes! POTW ... -
emulatorsplease help can we see clearly which emulator emaulates which hardware is there any that has a pc function key for the mulitface nmi button and the +…
... until I prove them. The 'R' register is another area that can ... 's contents so my PC register dump could return the correct ... fixed value to take the 'R' register back to the point just ... -
emulatorsplease help can we see clearly which emulator emaulates which hardware is there any that has a pc function key for the mulitface nmi button and the +…
... 're looking at (frame length, R register) were accurately emulated 10-15 ... -
emulatorsplease help can we see clearly which emulator emaulates which hardware is there any that has a pc function key for the mulitface nmi button and the +…
... 're looking at (frame length, R register) were accurately emulated 10-15 ... -
Transferring games into MicrodriveLast week a big pack of empty microdrive cartridges arrived, and now I'm ready to playing with my little microdrive equipped speccy. One of my aim w…
... code would be that the R register has not been preserved properly ... /> If I understand correctly the R register is changing all the time ... if you are setting this register at the beginning of your ... idea if the game uses R?
I have no ... -
Transferring games into MicrodriveLast week a big pack of empty microdrive cartridges arrived, and now I'm ready to playing with my little microdrive equipped speccy. One of my aim w…
... the reply. I set the R register incase BIT 7 is used ... -
guides and tips on converting multi loaders to diskhi all is their any sites with info about converting the various multi loading tape games over to disk using plus d interface? any pointers or info w…
... the speedlock stuff using the R register to decrypt itself. The debuggers ... usually did not emulate the R register faithfully and simply put the ... current R value in it...
RAND USR that doesn't work in emulators and clonesEons ago, I "discovered" a strange RANDOMIZE USR. This is it: [b]RANDOMIZE USR 46578[/b] Using it on a genuine ZX Spectrum rubber key or Plus model,…
... [7..0] = 0B-0Ch R=0
dec hl ; ... [7..0] = 0F-10h R=2
inc h ; ... [7..0] = 13-15h R=4
djnz BucExt ; ... To acomplish it, the R register is reseted periodically, so ...RAND USR that doesn't work in emulators and clonesEons ago, I "discovered" a strange RANDOMIZE USR. This is it: [b]RANDOMIZE USR 46578[/b] Using it on a genuine ZX Spectrum rubber key or Plus model,…
... are doing something with the R register, which would introduce an element ... a way that the variable (R register or tstates-since-interrupt) is ...writing an emulator-newbie needs helpHi, this is my first post here. I decided to write a minimalistic emulator of ZX Spectrum-no emulation of advanced peripherals, no emulation of sound…
... instruction copied contents of A register to memory location at address ... know I had to increment R register after each instruction, but I ...writing an emulator-newbie needs helpHi, this is my first post here. I decided to write a minimalistic emulator of ZX Spectrum-no emulation of advanced peripherals, no emulation of sound…
... instruction copied contents of A register to memory location at address ... know I had to increment R register after each instruction, but I ...Fuse: what do you want to see?An open brainstorm. If you had a team of programmers working on [url=http://fuse-emulator.sf.net/]Fuse[/url], what would you tell them to work on? …
... imagine they would use the R register, which is changing so quickly ...Fuse: what do you want to see?An open brainstorm. If you had a team of programmers working on [url=http://fuse-emulator.sf.net/]Fuse[/url], what would you tell them to work on? …
... imagine they would use the R register, which is changing so quickly ... that can come from FRAMES, R, or a combination.
R are not sources of randomness ...z80 Startuphi everyone, does the z80 upon start up reset all registers (including A) to 0? Many thanks, Robin
Higher memory is not being accessed but you may be seeing memory refresh cycles which occur after every opcode fetch. That has the address IR (I register, R register) placed on the bus.Monty MoleDoes anyone know if the crushers in the Monty Mole games are random or if there's some sort of sequence to them?
... with the contents of the R register as well as the number ...Kobrahsoft DB1 - doesn't work?Hi, I've tried loading [URL="http://www.worldofspectrum.org/infoseek.cgi?regexp=^DB1$&pub=^Kobrahsoft$&loadpics=3"]DB1 by Kobrahsoft[/URL] into two …
... is doing stuff with the R register that I don't ... error, but because the IY register has a vastly wrong value ... 802E ED 57
LD R, A ; 8030 ED 4F
LD A, R ; 8048 ED 5F
LDI ...Kobrahsoft DB1 - doesn't work?Hi, I've tried loading [URL="http://www.worldofspectrum.org/infoseek.cgi?regexp=^DB1$&pub=^Kobrahsoft$&loadpics=3"]DB1 by Kobrahsoft[/URL] into two …
... to the use of the R-register which I didn't know ... .
Will the I-register always be set to $3F ... ? - because that's what the R-register is getting set to at ...Fastest way to mirror a byte?I.E. turning 01100000 into 00000110, in assembly. I'm trying but I suck at stuff with rotation and the carry bit. Any pointers?
... types of interrupts increase the R register by one, when accepted..."
R will be incremented according to ... RST instruction which does increment R by 1 but I have ...Done the unthinkableI bought Spectaculator today because I am sick of how unstable ZX Spin has become. I have to admit it looks great on my laptop plugged through to my …
... of video RAM or the R register or whatever. As long as ...Done the unthinkableI bought Spectaculator today because I am sick of how unstable ZX Spin has become. I have to admit it looks great on my laptop plugged through to my …
... of video RAM or the R register or whatever. As long as ...
