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Canny use of the 'r' register?Seeing Sokurah's code in the [URL="http://www.worldofspectrum.org/forums/showthread.php?p=583188#post583188"]crunch sound thread[/URL] has made me th…
... the r register.
I've used this a fair bit myself ... eg:
ld a,r
cp n
jp ... see how it's a bit of a blunt instrument as ... any crafty uses for the r register? -
R registerI'm cross-posting this as a spin-off of a [url="http://www.worldofspectrum.org/forums/discussion/52748/zx-spectrum-cartridges/p2"]thread in "Hardware…
... & correctness of the R register behaviour.
... br /> [quote]Memory Refresh (R) Register.
The ... that:
1 - R register, bit 7 must not change without ... R register to zero, hence also changes bit 7.
2 - R register ... -
R Register, Contended RAM and ClonesHi. I've had a quick look at the CSS FAQ but didn't spot quite what I'm looking for (also the CSS FAQ doesn't have much detail of the clones - there …
... the progress of the R register. At one point I ... between the reads of R is pretty much static ... contended RAM on the R-register? I do not run ... no effect as the R-register is internal to the ... , Scorpion, ...) affect the R-register differently? Again I would guess ... -
The R RegisterI've found some documentation regarding the R register (in that it is updated every M cycle except for a certain number of opcodes in which it is upd…
... found some documentation regarding the R register (in that it is updated ... the maximum value of the R register is +127? If so, do ... -
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…
... reply. I set the R register incase BIT 7 is used otherwise I ... -
Pocket Clive - 2 QuestionsHello, I've just started using Pocket Clive on my iPaq pocket PC, excellent emulator BTW. 1. I have just wrote a small BASIC program to randomly pi…
... parameters will cause the high-order byte of SEED ... , and the r register. The resultant 16 bit value changes much ... now used for the high byte of the seed ... br /> ld a,r ; the refresh register is used for ... the result in the bc register pair
... -
The R RegisterI've found some documentation regarding the R register (in that it is updated every M cycle except for a certain number of opcodes in which it is upd…
Ignore Dr. Beep.
The low 7 bits of the R register act as a 7-bit counter. The high bit will stay set if you set it, and stay reset if you unset it. -
The R RegisterI've found some documentation regarding the R register (in that it is updated every M cycle except for a certain number of opcodes in which it is upd…
... of the R register act as a 7-bit counter. The high bit will stay ... -
Atic Atac speed.Dear all, Excuse the noob question, but does anyone know how fast Atic Atac runs at? What I mean is, frames per second, or the amount of pixels the…
[QUOTE=frobush;326995]
...it's all bollocks and messes with sound and stuff!!![/QUOTE]
Thanks for posting this code.
Oooh, Nice use of the high bit of the 'r' register! :D -
Atic Atac speed.Dear all, Excuse the noob question, but does anyone know how fast Atic Atac runs at? What I mean is, frames per second, or the amount of pixels the…
... the high bit of the 'r' register! :D[/QUOTE]
The *what*??? R register?
*googles it*
Holy crap! A register I ... -
Atic Atac speed.Dear all, Excuse the noob question, but does anyone know how fast Atic Atac runs at? What I mean is, frames per second, or the amount of pixels the…
... the high bit of the 'r' register! :D[/QUOTE]
High bit of the R register? ... I thought the R register ... /> [QUOTE=Arjun;327444]The *what*??? R register?
*googles it* ... -
Atic Atac speed.Dear all, Excuse the noob question, but does anyone know how fast Atic Atac runs at? What I mean is, frames per second, or the amount of pixels the…
... ]
High bit of the R register? I thought the R register went up ...
(i.e. Bit 7 always 0). This is ... you are right, unless bit 7 is manually set ... instructions are fetched, but bit 7 just holds whatever was ... memory of it is a bit hazy now!
Best way to organise a multi screen game?Hi All, Does anybody know ay good ways to organise large multi screen game? Or any links to useful texts on the matter? In my previous single scr…
Like you, R-Tape, I also noticed the ... as "uncollected") by resetting the high bit of all objects.
high bit of each object is set ... of setting up the IX register to the base address of ... data relative to the IX register, I suppose.ULA snow effectIt's wintertime, you know. [quote="http://ramsoft.bbk.org.omegahg.com/floatingbus.html"]when the I register falls in the range 0x40-0x7F then the UL…
... Once MREQ goes high, RAS goes high followed by CAS.
high, which is at the ... memory has a 7 bit address bus multiplexed than ... generates a 14 bit address). The result is ... lower 7 bits of R register instead the correct way.Deterministic random number generatorI'm looking for a random number generator in assembly which, given a seed, the generated sequence is always the same. You change the seed, you get a …
... random numbers larger than 8-bit you have to call ... and put together a 15-bit random number generator (as ... C standard, using 16-bit ints and always returning a ... number generator is a 32-bit XorShift RNG as
; ... ; The triple used is (L,R,L) = (8,9,23) which ...In-game AY music and sound effectsI'm currently working on various aspects of a Spectrum game and thinking now about the sound side of things. I know you can use a utility like Vortex…
... efficient and used the high bit of the r register to indicate when an ...Another Z80 processor questionOK, this time this isn't clearly covered in the FAQ, as far as I can see.... Suppose we have the CB instruction "SET b,r" (b=bit, r=register (differ…
... the CB instruction "SET b,r" (b=bit, r=register (different from (hl)))... If ... the result to the initial register r.
My question is ... apply if the instruction is BIT ? It doesn't do anything ...ULA bug and snowI am tryng to improve the snow emulation in FBZX wii but I do not have a real spectrum to test the results. I used the information taken from Harele…
... writing in the ULA video register the second screen byte it ... cycle and if the I register is between 0x40 and x7F ... bit of the address of second screen byte the value of R register ...Emulator compatibility with real SpectrumHi emulator programmers... Having spotted for the last 6 months that my iPAQ is still missing a Spectrum emulator I started typing last tuesday - an…
... for one) use bit 7 of the R register as a flag.
Be careful to preserve this bit ... incrementing it's value. Bit 7 should only change with ... a "LD R,A" opcode.
Are you ...Another Z80 processor questionOK, this time this isn't clearly covered in the FAQ, as far as I can see.... Suppose we have the CB instruction "SET b,r" (b=bit, r=register (differ…
... CB instruction "SET b,r" (b=bit, r=register (different from (hl)))... ... the result to the initial register r.
[/quote]
register also if you use ... if the instruction is BIT ? It doesn't ... t apply to the BIT opcodes at all. The ...Determining 50hz/60hz in softwareHow can you determine in software if you are running at 50hz or 60hz?
... using R register could actually work... but imho XOR A; LD R,A ... ). Of course R is not a full 16-bit counter but different ... ZX models might actually give different R ...How to speed up TZX loading (emu development)With many newer emulators there are options to do faster loading schemes, even for turbo-loader or protected loader blocks in TZX files. For example,…
... , a loader could check the R register, but none do that I ... figure that out, and shortcut R to match :-)
The ... edges through is the easy bit :-)
D ...R Register, Contended RAM and ClonesHi. I've had a quick look at the CSS FAQ but didn't spot quite what I'm looking for (also the CSS FAQ doesn't have much detail of the clones - there …
... constant timing.
Reason why R reg's content changes is ... performed.
R register is actually simple 7-bit counter. It increases ... to maintain R registers 'counting'. If set bit 7 of R reg to ...Cybernoid editorSo, my long tern goal is to make my own Cybernoid or Rex like game (see an ancient thread about Sprite advice)...but my skills are somewhat lacking..…
[QUOTE=Mr. Anonymous;175887][url=http://download.yousendit.com/A377C88A6C2139ED]>>>DemoNew protection systemsAs a follow-up to [URL="http://www.worldofspectrum.org/forums/showthread.php?t=14311&page=2"]this[/URL] thread regarding relatively new protection sy…
... XOR A. It's a bit tedious, though, so I think ... of forgetting to correct the R register so it made lots of ...New protection systemsAs a follow-up to [URL="http://www.worldofspectrum.org/forums/showthread.php?t=14311&page=2"]this[/URL] thread regarding relatively new protection sy…
... as it would affect the R register. Edit: Oh, I see, that ... sloppy and forgot that the R register would be totally wrong if ... 'll come back to that bit later.
[quote]IMHO ...New protection systemsAs a follow-up to [URL="http://www.worldofspectrum.org/forums/showthread.php?t=14311&page=2"]this[/URL] thread regarding relatively new protection sy…
... as it would affect the R register. Edit: Oh, I see, that ... (or LDDR) coupled with the R register didn't cause any real ... calculator get the val or R entering the LDIr then val ... value) and being caareful with bit 7 (as I remember)
Beautifully programmed gamesJust watching the bobby bearing tzx and admiring the beautiful programming involved. Which other games would you say had asthetic programming opposed…
... R' register in the 'sound routines' / 'wait for fly back'...
Bit ... 7 of the refresh 'R' register is used as ...
I use bit 7 of the 'R' register because you can test ... ld a,r ; put the contents of the refresh register into the ...Fuse 0.9.0 releasedVersion 0.9.0 of [url=http://fuse-emulator.sourceforge.net/]Fuse[/url], the Free Unix Spectrum Emulator[/url] has just been released. Highlights of t…
... /> I'm a bit puzzled by the "R Register Save & Restore" option ...The R RegisterI've found some documentation regarding the R register (in that it is updated every M cycle except for a certain number of opcodes in which it is upd…
... , which says: "The highest bit of the R register is never changed: this ... 128x128 matrix, needing a 7 bit refresh cycle."
Above ...
