-
My little first set of routines.Hi all, I just coded a little set of routines just to draw a screen on video mem and a fade out. I could have just copied the screen rendering rout…
... /> ld bc,32
scf
ccf ;set & complement carry = clear ... -
SCF/CCF flags - new discoveryI can't believe that no one is interested in discussing the additional, previously undocumented internal state of the Z80 CPU I have discovered recen…
I can't believe that no one is interested in discussing the additional, previously undocumented internal state of the Z80 CPU I have discovered recently. I have posted the details in [URL="http://www.worldofspectrum.org/forums/showthread.php?t=20345"]this ... -
New Z80 CPU emulation testerI have finally wrapped up the new [URL="http://zxds.raxoft.cz/taps/misc/z80test-1.0.zip"]Z80 tester package[/URL] I have previously announced in [URL…
... thread[/URL] regarding the authentic SCF/CCF behavior. All of the included ... ZEXALL replacement and test the SCF/CCF behavior. Feel free to provide ... -
JSpeccy 0.93A new JSpeccy version has been released. Summary of changes, - Drag & Drop support forTAP/TZX/CSW/SNA/SP/Z80/SZX/ROM files. - Command line options …
... & 5 emulation for instructions SCF/CCF (thanks to Patrick Rak by ... -
I introduce myself and my emulator.Hi! My name is Marta, and I've been a Speccy user for 30+ years now. During the past year I decided to write my own emulator, just to see if I cou…
... faithful Z80 emulation (except for SCF/CCF flags)
- Accurate 48K/128K ... -
Interrupts details questionSuppose I am writing a game and I want to use interrupts to measure time, draw the screen without flicker, maybe to poll keyboard etc. What kinds of …
... /> ld bc, 16384
scf
ccf
sbc hl, bc ; obtained ... bc, 16384+4096
scf
ccf
sbc hl, bc
ZXSpin 0.61 Available nowHi all! Well, after a lengthy few testing cycles, I'm taking the plunge and uploading the latest version of ZXSpin, to replace the rather aged old 0…
According to the [URL=http://www.mdfs.net/Software/Z80/Exerciser/Spectrum/]Z80 Exerciser[/URL], some flags are wrong.
The failed tests are:
hl,
add hl,
add ix,
add iy,
bit n,ZXSpin 0.61 Available nowHi all! Well, after a lengthy few testing cycles, I'm taking the plunge and uploading the latest version of ZXSpin, to replace the rather aged old 0…
[QUOTE=Metalbrain]According to the [URL=http://www.mdfs.net/Software/Z80/Exerciser/Spectrum/]Z80 Exerciser[/URL], some flags are wrong.
The failed tests are:
hl,
add hl,
add ix,
add iy,
bit n,
[/QUOTE]
ZXSpin 0.61 Available nowHi all! Well, after a lengthy few testing cycles, I'm taking the plunge and uploading the latest version of ZXSpin, to replace the rather aged old 0…
[QUOTE=Dunny]Yes, but we don't have any actual real-spectrum data - the test is flawed. Given that a real spectrum fails, we cannot be sure that the test is carried out correctly. Also, we don't know which Spectrum model was tested and failed - and the ...My little first set of routines.Hi all, I just coded a little set of routines just to draw a screen on video mem and a fade out. I could have just copied the screen rendering rout…
... /> ld bc,32
scf
ccf ;set & complement carry = clear ...Emulator accuracy test?When I first created my emulator it worked fine. But then I found one or two games that had odd quirks. Eventually I found the flag or command that w…
... the relocation problems and the SCF/CCF undocumented behaviour. Read the tech ...which is the best?Hello, Since RealX is not coming out in the near times (realSpectrum was my favorite emulator) Can anyone point me a good one to replace it??? Som…
... : anything involving undocumented flags after SCF/CCF (as we don't know ...which is the best?Hello, Since RealX is not coming out in the near times (realSpectrum was my favorite emulator) Can anyone point me a good one to replace it??? Som…
... : anything involving undocumented flags after SCF/CCF (as we don't know ...Questions about the Speccy and it's emulationOut of interest, and to raise another interesting discussion, I have some questions about the Spectrum and it's emulation; 1) Is everything known ab…
[QUOTE=Dunny;302899]No, but we now know a very great deal about the internals. I'd challenge anyone to write a program that runs differently on the real thing than on say, SpecEMU[/QUOTE]
Easy. Undocumented flags after SCF/CCF.Questions about the Speccy and it's emulationOut of interest, and to raise another interesting discussion, I have some questions about the Spectrum and it's emulation; 1) Is everything known ab…
... ;302902]Easy. Undocumented flags after SCF/CCF.[/quote]
Seemingly impossible ... from a real machine using SCF/CCF as long as the emulator ...Questions about the Speccy and it's emulationOut of interest, and to raise another interesting discussion, I have some questions about the Spectrum and it's emulation; 1) Is everything known ab…
... ;302902]Easy. Undocumented flags after SCF/CCF.[/quote]
Oh right ...Interlace demoSorry to reference another thread like this, but in the thread: [url]http://www.worldofspectrum.org/forums/showthread.php?p=313428#post313428[/url] …
... : MEMPTR and undocumented flags after SCF/CCF.Interlace demoSorry to reference another thread like this, but in the thread: [url]http://www.worldofspectrum.org/forums/showthread.php?p=313428#post313428[/url] …
... : MEMPTR and undocumented flags after SCF/CCF.[/quote]
You've ...Saboteur replaysI can't seem to be able to play the Saboteur replays as available in [url]http://www.rzxarchive.co.uk/s.php#saboteur[/url]. Both Spectaculator and Z…
Saboteur replaysI can't seem to be able to play the Saboteur replays as available in [url]http://www.rzxarchive.co.uk/s.php#saboteur[/url]. Both Spectaculator and Z…
Which is the most technically accurate Spectrum Emulator?Ok, which is the most technically accurate Spectrum Emulator? Please don't just vote but give reasons why.
... />
Spectaculator failed on
CCF
BIT n,(HL)
ZX32 failed on
SCF
CCF
CPL
NEG
Bit functions speedI just stared nonplussed at the documentation for the bit functions. Apparently, if you're using the accumulator, using AND and OR is faster than se…
... the carry flag:
scf
ccf.
Perfect! [and ...Rotating Register PairsWhat's the best way to rotate left (or right) a register pair, so that (eg.) FE76 becomes E76F (or 6FE7)? I presume that passing the intermediate bit…
[QUOTE=Ralf;486029]
[CODE]
SCF
CCF ;carry=0 so the new leftmost bit will be 0
[/CODE]
[/QUOTE]
BTW, it's faster to use just OR A to achieve this.
PatrikMEMPTR tests for emulator authorsI've recently been completing my MEMPTR implementation and have written a series of tests in [URL="http://homepage.ntlworld.com/mark.woodmass/z80test…
... the bits 5+3 after SCF/CCF rather than copy like NEC ...Fantasy Z80 instructions?This follows on from something catmeows said in another thread, and that I've been meaning to ask for a while. This may sound daft to people with mo…
... />
Other Instructions
------------------
SCF CCF NEG CPL RLD RRD DAA ...MEMPTR tests for emulator authorsI've recently been completing my MEMPTR implementation and have written a series of tests in [URL="http://homepage.ntlworld.com/mark.woodmass/z80test…
... the bits 5+3 after SCF/CCF rather than copy like NEC ... after POP AF ; SCF and POP AF ; CCF are set to OR ... discussion, he is using SCF+CCF and CCF+SCF to make it work the ... between POP AF and the SCF/CCF, to see what the outcome ...MEMPTR tests for emulator authorsI've recently been completing my MEMPTR implementation and have written a series of tests in [URL="http://homepage.ntlworld.com/mark.woodmass/z80test…
... putting various instructions between two SCF instructions. Here is what ... the flags, the subsequent SCF or CCF operation performs move operation ... the flags, the subsequent SCF or CCF operation performs OR operation ... it does not. The SCF/CCF then merely sets 5+3 ...
