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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…
Other than protection on a ZX Spectrum not so fast.
On a ZX81 it is used to set hiresscreendata or used for timing when you need to pass 9T states of time while doing hires, although it is used to SET R-register. -
Auto generated spritesLooking around for some graphics I came across [url]http://blog.disktree.net/?p=19[/url] , one of several such pages. Need the odd 8x8 UDG or two (…
... takes the contents of the r register, halves it & mirrors it ... key pressed
ld a,r ;r register always ticking round
and ... -
How to safely maximise available memoryHi All, I'm toying with an idea that will require I have as much memory available as possible. I'm a little embarrassed I have to ask this tbh. As…
... there's only the one R-register decryption loop and some messing ... -
Manic Miner ZX81Hi Guys, Can anyone explain why [url=http://www.worldofspectrum.org/infoseekid.cgi?id=0017539]Manic Miner ZX81[/url] is not able to reproduce the ex…
... scanline. How the I and R register affect rendering of the line ... you cannot point the I register to standard 16K RAM expansion ... -
Spectrum30 Show in Cambridge, 08th-09th September 2012Hello Spectrum-fans, after many months of preparation we now proudly present what will be the biggest Spectrum venue of the last 20 years. We manage…
... in which to test against. R register?[/QUOTE]
I don ... -
Zymosis -- WTFPL'ed Z80 Emulation Corebreaking news! i'm back with another useless project: new Z80 emulation core written in pure C! i hear you screaming: "oh, no! WHY?!" let me tell yo…
Zymosis -- WTFPL'ed Z80 Emulation Corebreaking news! i'm back with another useless project: new Z80 emulation core written in pure C! i hear you screaming: "oh, no! WHY?!" let me tell yo…
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…
... in the floating bus. If register I is between 0x40 and ... display):
1) The R register value in case of first ... previous reading which is the register R in the case of the ...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…
... with the contents of the r register, then a press 'any key ...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…
[QUOTE=R-Tape;650591]I'll be ... with the contents of the r register, then a press 'any key ... could probably have made the R register the other 8 bits, of ...RET MHello. I?ve seen in the Joffa game SAUCER a kind of loop like this LOOP LD A,R RET M JR LOOP I do know what this loop mea…
... document).
Is this R register routine the same but just ... expect LD A,R or the cycling of the R register to affect ...RET MHello. I?ve seen in the Joffa game SAUCER a kind of loop like this LOOP LD A,R RET M JR LOOP I do know what this loop mea…
... the cycling of the R register to affect the flags.[/ ... might be caused by R being routed through the ... rather than a direct register-to-TMP-to-register copy.
< ... any other 8-bit register is. What I know ... it's because the register value has been routed ...MC LPRINT 23681Having problems with this routine to print large on the screen using LPRINT, it works ok in BASIC, but cant seem to get it to loop for some reason in…
... probably comes from masking the r register with 0x5. This limites the ... adding 1).
The 'r' register is sensitive to the length ... b,159
ld a, r
and 0x37 ; Avoid ... , a
ld a, r
ld e, a
[NEW] Speccy for Android ReleasedHello, All! A while ago, I have released the Android version of [i]Speccy[/i], my ZX Spectrum emulator. It emulates Spectrum 16k, 48k, 128k, +2, +2A…
... release. After implementing [B]proper R register emulation[/B] and [B]more ... vitrual keyboard.
* Added accurate R register emulation, many protected boot loaders ...Manic Miner ZX81Hi Guys, Can anyone explain why [url=http://www.worldofspectrum.org/infoseekid.cgi?id=0017539]Manic Miner ZX81[/url] is not able to reproduce the ex…
... sent out by setting I-register and R-register and a call to ...[NEW] Speccy for Android ReleasedHello, All! A while ago, I have released the Android version of [i]Speccy[/i], my ZX Spectrum emulator. It emulates Spectrum 16k, 48k, 128k, +2, +2A…
... />
CHANGES:
* Added accurate R register emulation, many protected boot loaders ... .
* Added more realistic "LD R,A" opcode to the Z80 ...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…
... I can see where the r register only incrementing through the lower ...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…
... can see where the r register only incrementing through the ... offset value in another register, which is then copied ... 4 update B and R
ld r,a ;9 96T ... pattern for the values in R becomes (assuming offset = ... lines except every 3rd : R loops back to char. ...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…
... address
A7-A0 = the R register of the Z80
[/QUOTE ...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…
... address for A15-A7, and R register for A6-A0. That slightly ... contradicts the Ramsoft docs (R for A7-A0 stated there ...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…
... with 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 …
... /> ; The triple used is (L,R,L) = (8,9,23) which ...PlusDlite problems with 128K modelsLast year I developed the PlusDlite, and already shipped out a couple of them. Only recently I discovered some problems with 128K models. I remember…
... 005E POP AF Restore A register and return to the
0062 PUSH AF Save R register and interrupt status.
... NMI PUSH AF Save A register.
0067 JR #0053 ...
