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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…
BTW, after reviewing what Woody was trying before, I have now tested that the hypothetical Q register is really reset and does not depend on I or R, so at least that's good. :)
Patrik -
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…
... .
As for this 'Q' register, if it exists at all ... -
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…
... SCF is affected by the Q register, which is good. It means ... an interrupt might affect the Q register. And it turns out that ... an interrupt clears the Q register as well, so regardless of ... -
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…
... add the new information. ... The (Q ^ F) | A logic seems odd ... ]
Thanks, zub. The Q register was just a broader concept ... are moved to the F register), we have no evidence how ... -
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…
... 758844]Thanks, zub. The Q register was just a broader concept ... this regard, so the Q register seems very unlikely to ... model this as a 'Q' register as it will be ... that updates the flags register, but that's an ... 'll probably model our Q register in such a way ... -
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…
... )?[/quote]
Apparently the Q register is the instruction latch itself ... -
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…
... /> [quote="kosarev;998987"]Apparently the Q register is the instruction latch itself ... [/quote]
Indeed, the Q was just a semantical construct ... a full featured dedicated physical register as such - it was just ... -
Are Horace & Q-Bert related?I think they might be........ Q-Bert has a big nose though. Maybe they are half-brothers?
I think they might be........
Q-Bert has a big nose though. Maybe they are half-brothers? -
FUSE : APPLE + QI hate this keycombination. I need SYMB+Q APPLE works like SYMBOL SHIFT, but on the Q it's QUIT (without warning). Please program a warning screen i…
I hate this keycombination. I need SYMB+Q
APPLE works like SYMBOL SHIFT, but on the Q it's QUIT (without warning).
Please program a warning screen in between.
I have lost several programs without having saved it. -
Matthew Smith CGE Q&A Session for DownloadMorning all, Some of you may or may not be aware that the footage I took at the recent Classic Gaming Expo was being transferred to DVD, with the fo…
... with Andrew Oliver
- Full Q&A session with Andrew ... Oliver
- Full Q&A session with Matthew ... have made the Matthew Smith Q&A session available via ... -
Is the IY register used by the spectrum rom?Hi I've been writing a sprite routine and have noticed that the sprite data gets corrupted at some points. I have no idea why and can only guess tha…
... the problem. Does the IY register need to hold a certain ... -
If you had an I.Q of 160, you would....1) be 16 years old 2) be in U.S. 3) post 6 new boring topics everyday on a forum dedicated to a brilliant home computer of the 80's 4) have Asperger'…
Q*BertCan anyone recommend any decent Q-Bert games on the speccy? The only one I remember playing 1st time around was one with a pyramid made of mushrooms …
Can anyone recommend any decent Q-Bert games on the speccy?< ...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 reset ... contended RAM on the R-register? I do not run any ... no effect as the R-register is internal to the Z80 ... (Pentagon, Scorpion, ...) affect the R-register differently? Again I would guess ...Q. on Livejournal.Hey ... I remember seeing an interesting blog on Livejournal quite a while ago ... I used to be able to get to the page by typing in the username on …
... user [b]without having to register/login/be-a-user-myself ...which domain to register?I'm about to register a domain under my country's top domain. almost all of the keywords are available to buy and I'm a bit indecisive person. which…
I'm about to register a domain under my country' ...PC200 Q'sJust started researching 1988, and naturally I'll be mentioning the ill-fated PC200. A Q and a req: Q: Did the PC200 actually get released in 1988?…
... -fated PC200.
A Q and a req:
Q: Did the PC200 actually get ...Blowtorch method of Speccy repairsI just did my first Spectrum repair (and successful at that). It was the Issue 2 spectrum I wrote about a while ago, I just hadn't got around to doin…
... the chips off the cash register boards with my trusty B ... &Q electric paint stripping gun.
IY RegisterIve got a really bizarre bug, and I have only just started using the IY register. I seem to remember reading somewhere in a programming book, to neve…
... just started using the IY register. I seem to remember reading ... , to never use the IY register. Am I dreaming this?
register (HL, DE, BC) for zero ...Sinclair QL, CST Q+4, disk drives etc.I've got a large expanded QL package up for grabs on EBAY at the moment. Check it out if you're interested here: [url]http://cgi.ebay.co.uk/Sinclai…
... .uk/Sinclair-QL-Computer-CST-Q-4-640K-RAM-2x-DISK ...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…
... some documentation regarding the R register (in that it is updated ... maximum value of the R register is +127? If so, do ...pogo/q-bertare there any other q-bert clones assides from pogo? any good ones (or at least not as annoying as pogo?)
are there any other q-bert clones assides from pogo? any good ones (or at least not as annoying as pogo?)The F register unused bitsI'm doing some reading and trying to organize my Spectrum ML apprenticeship and while looking in greater detail at the flag register one question pop…
... greater detail at the flag register one question popped.
Can I manipulate this register directly or make use of ...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…
... rotate left (or right) a register pair, so that (eg.) FE76 ...A clever method of using a single 8-bit register to be used for two things at a timeI don't know if this is the way the SAVE routine in the Spectrum works. Anyway, this is what I've learned today. I've been commented the disassembly…
... : I didn't found a register that holds 8, and in ... is: a single 8-bit register (L) holds both the byte ... left to transfer, the L register is not 0.
So ...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…
... me think about the r register.
I've used ... crafty uses for the r register?Simple AY library in z88dk/CI was interested to see if I could make the 128k AY chip work, and as there wasn't any library on it, I just made one for fun. It's certainly not th…
... *p)
{
// IN: h=register, l=value
// OUT: out ... ()
{
uint i,j,q;
ay_volume1(15);
SpecBAS article in The Register todayDunny's SpecBAS (for the Raspberry Pi) got a write-up in The Register today: [url]http://www.theregister.co.uk/2012/11/13/sinclair_basic_for_raspber…
Dunny's SpecBAS (for the Raspberry Pi) got a write-up in The Register today:
[url]http://www.theregister.co.uk/2012/11/13/sinclair_basic_for_raspberry_pi/[/url]
